Guides & Calculators
Step-by-step guides for common projects, plus all free calculators in one place.
01 Guides
How Much Paint Do I Need for a 12x12 Room?How much paint for a 12x12 room? The answer is 2 gallons for two coats. Step-by-step math, a chart for every…How Many Tiles Do I Need? Simple Guide for Any RoomHow many tiles do I need? The math is easy: area + 10% waste + box rounding. Charts for common rooms and buyi…How Much Concrete for a 10x10 Slab? (Bags & Yards)A 10x10 slab at 4 inches deep needs 1.23 cubic yards or 74 bags of 60 lb concrete. Full math, charts and bags…How Many Boxes of Flooring Do I Need? (Calculator + Chart)How many boxes of laminate or vinyl flooring do I need? Chart for common rooms, waste by pattern and pro buyi…How Much Carpet Do I Need for a 12x12 Room? (Chart + Calc)A 12x12 room needs 158 sq ft of carpet (17.6 sq yd). Chart by room size, roll width and full cost breakdown.How Many Drywall Sheets for a 12x12 Room? (Calculator)A 12x12 room needs about 19 sheets of 4x8 drywall (walls + ceiling). Full math, chart and supplies list.How Much Mulch Do I Need for a 10x10 Garden? (Chart + Calc)A 10x10 garden bed needs 25 cu ft of mulch — 13 bags or 0.93 yards at 3 inches deep. Full chart and bags vs b…How Much Gravel for a Driveway? (Depth + Cost Guide)A 10x40 driveway needs about 4.9 cubic yards (7.4 tons) of gravel. Depth guide, layers and cost per ton.What Size Air Conditioner Do I Need? (BTU Chart + Calculator)20 BTU per square foot is the rule. BTU chart by room size, adjustments for sun and ceiling, and tons convers…What Size Ceiling Fan Do I Need? (Room Chart)42-44 inch for a 12x12 room. Full blade-span chart by square footage and mounting rules.What R-Value Do I Need? Insulation Chart by ZoneAttic R-38 to R-49, walls R-13 to R-21 by climate zone. Depth check table and insulation types.How to Stain a Deck: 7-Step Guide (+ Calculator)How much stain and how to apply it: prep, 7-step process, amount chart and pro tips.How Much Gravel and Sand for a Paver Base? (Chart + Calc)A 100 sq ft patio needs 1.5-2 yards of gravel and 1 ton of sand. Step-by-step base build guide.How Many Sq Ft Does a Gallon of Paint Cover?One gallon of paint covers about 350 sq ft. Full coverage table, project estimates and pro tips.How Many Roofing Squares Do I Need?How many roofing squares do I need? Measure the footprint, multiply by your roof pitch factor, add 15% for wa…How Much Siding Do I Need for a House?Measure each wall, subtract doors and windows, then add 10% for waste — see the step-by-step method and a cha…How Much Wallpaper Do I Need for a Room?Measure the perimeter, multiply by wall height, subtract doors and windows, then divide by usable roll covera…What Size Water Heater Do I Need?Count bedrooms, bathrooms and fixtures, then match them to a tank size — see the sizing chart for 1 to 5+ peo…How Many Fence Pickets Do I Need?How many fence pickets do I need? Length × 12 ÷ (picket width + gap), rounded up — plus a size table and a worked 100 f…How Many Deck Boards Do I Need?How many deck boards do I need? Divide your deck area by the board's coverage (width × length), then add 10% for waste…How Much Grout Do I Need for Tile?How much grout do I need for tile? Find lb per sq ft by tile size and joint width in the table, or run the formula — 12…How Much Sod Do I Need for My Lawn?How much sod do I need? Divide your lawn's square footage by 10 (a standard 2×5 ft roll), add 5–10% for waste and round…How Many Bricks Do I Need for a Wall?How many bricks do I need? Multiply the wall's square footage by 6.5 (modular brick, 3/8 in joint), add 10% waste and…How Much Topsoil Do I Need?How much topsoil do I need? Cubic yards = area (sq ft) × depth in feet ÷ 27 — a 500 sq ft bed at 4 in needs about 6.2…How Much Gutter Do I Need for My House?How much gutter do I need? Total every roof edge that drains — that's your gutter footage. Plan one downspout per 35–…How Many Plants Do I Need for My Garden Bed?How many plants do I need? Divide bed length and width (in) by plant spacing, round up each, then multiply: an 8×4 ft…How Many Backsplash Tiles Do I Need?How many backsplash tiles do I need? Square feet = run length (ft) × height (in) ÷ 12; tiles = square feet ÷ the area…How Much Countertop Do I Need?How much countertop do I need? Measure each straight run, multiply length by depth (about 2 ft) and add them up: most…How Much Carpet Do I Need for Stairs?How much carpet do I need for stairs? Each step needs its tread run plus riser: a straight run of about 13 steps at 3…What Size Generator Do I Need?What size generator do I need? Total your running watts, then add the largest startup surge. Essentials only: 3-4 kW;…How Many Rafters Do I Need?How many rafters do I need? Per slope: (length ft × 12) ÷ spacing, rounded up, plus 1 — a 30-ft roof at 24 in o.c. ne…How Many Stair Stringers Do I Need?How many stair stringers do I need? Stairs up to 24 in wide usually take 2 stringers, 30–36 in takes 3, and every ext…How Many Board Feet of Lumber Do I Need?How many board feet of lumber do I need? Board feet = (thickness in × width in × length ft) ÷ 12 — a single 2×4×8 is…How Much Concrete Do I Need for Fence Posts?How much concrete for fence posts? A 4×4 wood post needs about 1/2–2/3 bag of 60-lb mix in an 8–10 in × 30 in hole —…What Size Mini Split Do I Need?What size mini split do I need? Figure about 20 BTU per square foot: a 400 sq ft room with ordinary sun needs a 9,000…How Much Epoxy Do I Need for a Garage Floor?How much epoxy do I need? Multiply floor area by coats, divide by the kit's single-coat coverage and round up: a 20×2…How Much Paint Do I Need for a 2-Car Garage?How much paint for a 2-car garage? About 3–4 gallons for two coats: a 20×20 ft garage with 9-ft walls nets ≈588 sq ft…How Many Tiles Do I Need for a Shower?How many tiles do I need for a shower? A 60×30 in, 72 in high three-wall tub surround is about 55–65 sq ft. Divide wa…How Many Solar Panels Do I Need?How many solar panels do I need? Daily kWh (monthly ÷ 30) ÷ (panel W ÷ 1000 × peak sun hours × 0.8): a 1,000 kWh/mont…How Much Concrete for a 12x20 Patio?How much concrete for a 12x20 patio? A 4-in-thick slab is 80 cu ft ≈ 3 cubic yards — about 134 bags of 80-lb mix. Con…How Many Gallons of Water Are in My Pool?How many gallons of water are in my pool? Multiply length × width × average depth (ft) × 7.48 — a typical 20×40 ft po…How Many Bags of Concrete per Square Foot?How many bags of concrete per square foot? At 4 in thick you need about 0.56 bags of 80-lb mix per sq ft — one 80-lb…How Many Tiles per Square Foot?How many tiles per square foot? Divide 144 by the tile area in square inches: a 12×12 tile is 1 per sq ft, a 12×24 ti…How Much Concrete for 10 Fence Posts?How much concrete for 10 fence posts? Standard 4×4 posts in regular 8–10 in × 30 in holes need about 8 bags of 80-lb…How Much Concrete for a Mailbox Post?About 1.1 cu ft of concrete — a 10-in diameter hole 24 in deep needs roughly 2 bags of 80-lb mix for a mailbox post.…How Much Paint for a 12x14 Bedroom?How much paint for a 12x14 bedroom? With 8-ft walls, one door and one window, two coats need about 2-3 gallons (≈2.2)…How Much Material for a 12x12 Bedroom?How much material for a 12x12 bedroom? A full 12x12 finish typically uses ~2 gal wall paint, 1 gal ceiling paint, ~17…How Much Material for a 20x20 Garage?How much material for a 20×20 garage? Roughly 4 gallons of wall paint for two coats and 2–3 epoxy floor kits, plus ~1…How Many Pavers for a 4x8 Walkway?How many pavers for a 4×8 walkway? The path is 32 sq ft: 12×12 in pavers ≈ 32, 16×16 in pavers ≈ 18 — buy 10% extra (…How Much Grout for a Subway Tile Backsplash?A 3×6 subway tile backsplash with 1/8 in joints grouted 3/8 in deep takes about 0.22 lb of grout per sq ft, so a 30 s…How Much Mulch for a 4x8 Raised Bed?How much mulch for a 4×8 raised bed? The bed is 32 sq ft; a 2-inch layer needs about 5.3 cu ft — roughly three 2-cu-f…How Many Tiles for a 3x5 Bathroom Floor?How many tiles for a 3×5 bathroom floor? The floor is 15 sq ft: you need 15 twelve-inch tiles or 34 eight-inch tiles…How Much Material for a 10x10 Shed Pad?How much material for a 10×10 shed pad? The 100-sq-ft pad at 4 in deep needs about 56 bags of 80-lb concrete (or ~1.5…How Many Drywall Sheets for a 20x20 Garage?A 20×20 garage needs about 19–20 4×8 drywall sheets for the walls (~588 sq ft net) and about 34–36 with the ceiling p…How Much Concrete for a 6x6 Post?How much concrete for a 6×6 post? A 12-in-diameter hole 36 in deep needs about 2.4 cu ft — roughly 4 bags of 80-lb mi…How Much Paint for a Ceiling?How much paint for a ceiling? A gallon covers about 350–400 sq ft per coat, so a 12×12 ft ceiling (144 sq ft) takes a…How Much Baseboard Do I Need?How much baseboard do I need? Subtract door openings from the perimeter: a 12×12 room ≈ 45 linear ft (6 sticks of 8-f…How Many Studs Do I Need for a Wall?How many studs do I need? At 16 in on-center, count (wall length in ÷ 16, rounded up) + 1: a 10 ft wall needs about 9…How Many Blocks for a Retaining Wall?How many blocks for a retaining wall? Divide wall length and height (in) by block length and height, round up, multip…How Many Gallons in an 18-Foot Round Pool?How many gallons in an 18-foot round pool? About 7,600 at a 4 ft average depth and about 6,700 at 3.5 ft. See the ful…How Much Material for a 12x14 Bedroom?How much material for a 12x14 bedroom? A full finish takes about 3 gal of wall paint (two coats), 1 gal of ceiling pa…How Much Material for a 24x24 Garage?How much material for a 24×24 garage? A 24×24 double garage needs about 5 gal of wall paint (two coats), 3 epoxy kits…How Many Balusters Do I Need?How many balusters do I need? Divide the clear rail length (in) by baluster width + max spacing and round up: a 12 ft…How Much Grass Seed Do I Need?How much grass seed do I need? A new lawn takes about 5–10 lb per 1,000 sq ft — a 2,000 sq ft yard ≈ 12 lb. Overseedi…How Many Shiplap Boards Do I Need?How many shiplap boards do I need? Divide the wall area by the coverage per board — a 1×6 covers 5.5 in of width, so…How Many Ceiling Tiles Do I Need?How many ceiling tiles do I need? Divide your ceiling area by the tile coverage (2×2 = 4 sq ft, 2×4 = 8 sq ft), add 1…How Many Blocks for a Fire Pit?How many blocks for a fire pit? A 3 ft inner diameter with 12 in blocks takes about 10 per ring: 2 layers ≈ 20 blocks…How Much Chain Link Fence Do I Need?How much chain link fence do I need? Divide the run by 50 ft per roll of fabric and plan a post every 10 ft: a 150 ft…How Many Steps Do I Need?How many steps do I need? Divide total rise (in) by target riser height and round up: an 8 ft rise (96 in) at 7 in ri…How Much Gravel for a French Drain?How much gravel for a French drain? Multiply the trench volume by 0.85 for the pipe and settling: a 12×18 in trench,…How Much Soil for a Raised Garden Bed?How much soil for a raised garden bed? Multiply length × width × depth in feet: a 4×8 ft bed filled 12 in deep holds…How Much Does a Concrete Slab Cost?How much does a concrete slab cost? Estimate the concrete at $5–8 per sq ft, add 15–30% for labor and sub-base: a 10×…How Much Landscape Edging Do I Need?How much landscape edging do I need? A rectangle takes 2 × (length + width) and a circle takes π × diameter: a 20×10…How Much Stain for a Fence?How much stain for a fence? Area = length × height × sides × coats ÷ coverage: a 100×6 ft fence, both sides, two coat…How Much Material for a 12x16 Living Room?How much material for a 12×16 living room? Wall paint ≈3–4 gal, floor ≈21 sq yd, baseboard ≈54 ft, ceiling paint 1 ga…How Much Sod for 1/4 Acre?How much sod for 1/4 acre? A quarter acre is 10,890 sq ft — about 1,090 rolls of sod (10 sq ft per roll), roughly 25…How Many Bags of Concrete for a 20x20 Slab?How many bags of concrete for a 20x20 slab? At 4 in thick it needs 133.3 cu ft — about 222 bags of 80-lb mix, or ~5 c…How Much Paint for a Living Room?How much paint for a living room? A 12×16 ft room with 8-ft walls: net walls ≈400 sq ft, two coats ≈2.5–3 gallons — b…How Much Material for a 10x12 Bedroom?How much material for a 10x12 bedroom? With 8-ft ceilings, plan on about 2–3 gal of wall paint, 15 sq yd of carpet, 4…How Many Gallons in a 24-Foot Round Pool?How many gallons in a 24-ft round pool? At a 4 ft average depth it holds about 13,500 gallons — about 11,900 at a 3.5…How Many Bags of Concrete for a 24x24 Slab?How many bags of concrete for a 24x24 slab? A 24×24 ft slab at 4 in thick is 192 cu ft — about 320 bags of 80-lb mix,…How Many Solar Panels for a 2,000 Sq Ft Home?How many solar panels for a 2,000 sq ft home? At a typical 1,000–1,200 kWh monthly use, 400W panels and 4.5 sun hours…How Much Grass Seed for 1/4 Acre?How much grass seed for 1/4 acre? A quarter acre is 10,890 sq ft: a new lawn at 6 lb per 1,000 sq ft needs about 65 l…How Much Material for a 14x16 Bedroom?A 14×16 bedroom (8-ft ceilings) needs about 4 gal of wall paint, 27 sq yd of carpet, 62 ft of baseboard and 1–2 gal o…Concrete vs Pavers Patio: Cost & ChoiceA 12×20 patio in poured concrete costs about $1,200–1,700 installed, and the same patio in pavers about $1,700–2,800,…Paint vs Stain for a Fence: Which Is Better?Stain is the more forgiving fence finish: it soaks into the wood, protects it and recoats without stripping, while pa…Mulch vs Rock for Garden BedsWood chips win in garden beds: cheaper, they feed the soil and insulate roots but need yearly top-ups. Rock is pricey…What Size Pond Liner Do I Need?What size pond liner do I need? Add two depths plus two 1-ft overlaps to each dimension: a 10×6×2 ft pond needs a 16×…How Many Solar Panels for a 1,500 Sq Ft Home?How many solar panels for a 1,500 sq ft home? A typical 700–900 kWh/month bill needs about 17–21 panels (400 W, 4.5 s…How Much Does It Cost to Install a Fence?Fence installation costs about $15–45 per linear foot installed — wood privacy $15–35, vinyl $25–45, 4 ft chain link…How Much Does It Cost to Stain a Fence?How much does it cost to stain a fence? DIY materials run about $0.05–0.10/sq ft; hiring a pro runs about $1–3/sq ft…How Much Does It Cost to Build a Deck?A finished wood deck runs about $20–45/sq ft and composite about $30–60/sq ft installed: a 12×16 (192 sq ft) wood dec…Sod vs Grass Seed: Which Is Better?Sod is instant but pricey: about $0.30–$0.55 per sq ft plus two weeks of daily watering. Grass seed runs $0.01–$0.05 per sq ft but takes 2–4 weeks to…How Much Mulch for a 1,000 Sq Ft Yard?A 2 in layer over 1,000 sq ft is about 167 cu ft ≈ 6.2 cu yd: order 7 yd in bulk or 84 two-cu-ft bags. Full depth table from 1/2 in to 4 in with bag…How Many Bags of Concrete for a 4x4 Slab?A 4×4 ft slab at 4 in thick needs about 5.3 cu ft — roughly 9 bags of 80-lb mix (8 at 3.5 in). Bag table by thickness plus bagged vs ready-mix cost…How Many Pavers for a 12x12 Patio?A 12×12 patio is 144 sq ft: you need 144 pavers in 12×12 in, 81 in 16×16 in, 64 in 18×18 in or 36 in 24×24 in. Buy 10% extra (159/90/71/40) for cuts…How Many Solar Panels for a 5kW System?A 5 kW system needs 13×400 W, 12×425 W, 12×450 W or 10×550 W panels (5,000 ÷ panel watts, rounded up), plus about 240–330 sq ft of clear roof. Count…How Many Bags of Blown-In Insulation Do I Need?A 1,000 sq ft attic at R-38 takes about 40 bags of blown-in cellulose (about 25 sq ft per 19 lb bag at R-38, roughly 10.3 in deep); R-49 takes about…How Many 12x24 Tiles Do I Need for a Bathroom Floor?A 5x8 bathroom (40 sq ft) needs 20 tiles of 12x24 in — each tile covers 2 sq ft. Add 10% waste: 40 ÷ 2 = 20, then 20 × 1.1 = 22, so buy 22–23 tiles,…How Much Material for a 6x8 Fence Gate?How much material for a 6×8 fence gate? About 14 dog-ear pickets, 8 pcs of 8-ft 2×4, 4 T-hinges, a latch set, 2 posts and 4 bags of 80-lb concrete.4x4 vs 6x6 Post: How Much Concrete for Each?A 4×4 post in a 10-in hole set 30 in deep takes about 1.2 cu ft of concrete — 2 bags of 80-lb mix. A 6×6 post in a 12-in hole takes about 1.4 cu ft — 3…How Many Sod Rolls for 200 Sq Ft?A 200 sq ft lawn takes about 20 rolls of 2×5 ft sod at net coverage; add 5–10% for trimming and waste, so order 21–22 rolls — or about 30 big 24×40 in…How Much Mulch for a Round Tree Ring?A 6 ft round tree ring, 3 in deep, takes about 7 cu ft of mulch (four 2 cu ft bags); an 8 ft ring takes about 12 cu ft (seven bags). Ring area = π(R² −…How Many Landscape Blocks for a 2-Foot Wall?A 2 ft high retaining wall needs about 6 landscape blocks per linear foot: 6 courses of 4-in-tall blocks, 1 block per foot per course. A 20 ft wall…How Many Pavers for a Fire Pit Ring?A 36-inch fire pit ring needs about 11 pavers (order 12–13); a 3.5-ft ring takes 13 (order 14–15); a 4-ft ring takes 15 (order 16–17).How Much Mulch for a 10x20 Garden Bed?A 10×20 ft (200 sq ft) bed at 2 in deep needs about 33 cu ft of mulch: buy 2 cubic yards of bulk or 17 bags of 2-cu-ft; at 3 in deep, about 2 cubic…How Many Solar Panels for a 3kW System?A 3 kW system takes about 8 × 400 W, 8 × 425 W, 7 × 450 W, or 6 × 550 W panels (3,000 ÷ panel watts, rounded up), from roughly 140–150 sq ft of modules…How Many Tiles for a 4x6 Shower?A 4×6 ft shower with 84 in walls needs about 88 sq ft of wall tile plus 24 sq ft of floor, roughly 112 sq ft total: buy 124 tiles in 12×12 in (112 net)…How Much Paint for Kitchen Cabinets?A standard kitchen with about 40 sq ft of cabinet-door fronts needs roughly 1 gallon of primer and 2 gallons of topcoat: both faces and edges are…How Many Bags of Concrete for a 4x8 Slab?A 4x8 ft (32 sq ft) slab poured 4 in thick needs about 10.7 cu ft of concrete — 18 bags of 80-lb mix or 24 bags of 60-lb mix; at 3.5 in, about 16 bags…How Many Pavers for a 10x10 Patio?A 10×10 ft patio is 100 sq ft: 100 pavers in 12×12 in, 57 in 16×16 in, 45 in 18×18 in, or 25 in 24×24 in. With 10% waste, buy 110, 63, 50, or 28.How Much Paint for a Basement?How much paint for a basement? A 20×30 ft basement with 8-ft walls has about 770 sq ft of net wall: about 5 gallons of topcoat for two coats and 3…How Much Gravel for a 10x10 Patio?A 10x10 ft gravel patio needs about 42 cu ft of gravel: a 25 cu ft base of 3/4-in crushed stone plus a 17 cu ft pea gravel surface - roughly 1.5 cubic…How Many Solar Panels for a 7.5kW System?A 7.5 kW solar system needs about 19 panels at 400W, 18 at 425W, 17 at 450W or 14 at 550W (7,500 ÷ panel wattage, rounded up). The modules span about…How Many Blocks for a 3-Foot Retaining Wall?A 3 ft high retaining wall needs about 9 landscape blocks per linear foot: 9 courses of 4-in-tall blocks, 1 per foot. A 20 ft wall runs about 180 body…How Many Bags of Concrete for a 6x8 Patio?A 6x8 ft (48 sq ft) patio slab poured 4 in thick needs about 16 cu ft of concrete — 27 bags of 80-lb mix or 36 bags of 60-lb mix; at 3.5 in, about 24…How Much Mulch for a 12x12 Garden?A 12×12 ft (144 sq ft) garden at 2 in deep needs about 24 cu ft of mulch: order 1 cubic yard of bulk or 12 bags of 2-cu-ft. At 3 in deep, plan on about…How Many Tiles for a 5x7 Bathroom Floor?A 5×7 ft (35 sq ft) bathroom floor takes about 35 net 12×12 in tiles — buy 39 with a 10% waste buffer. Large 12×24 in tiles run about 18 net (buy 20);…How Much Paint for a 16x20 Garage?A 16x20 ft garage with 9-ft walls and a 16x7 garage door has about 520 sq ft of net wall — about 3 gallons of topcoat for two coats; painting the…How Much Sod for Half an Acre?A half-acre lawn is 21,780 sq ft: about 2,178 rolls of 2×5 ft sod laid net, or 2,300–2,400 rolls with 5–10% waste — roughly 2,420 sq yd, about 49…How Many Tiles for a 10x12 Kitchen Floor?A 10x12 ft kitchen floor is 120 sq ft: about 120 net 12x12 in tiles (buy 132 with 10% waste) or 60 net 12x24 in tiles (buy 66). Skip cabinets and count…How Many Pavers for a 12x16 Patio?A 12×16 ft patio is 192 sq ft: 192 pavers in 12×12 in, 108 in 16×16 in, 86 in 18×18 in, or 48 in 24×24 in. With 10% waste, buy 212, 119, 95, or 53.How Many Sod Rolls for 500 Sq Ft?A 500 sq ft lawn takes about 50 rolls of 2×5 ft sod at net coverage; add 5–10% for waste and order 53–55 rolls — roughly 2 pallets (each pallet holds…How Many Tiles for an 8x10 Bathroom Floor?An 8x10 ft (80 sq ft) bathroom floor takes about 80 net 12×12 in tiles — buy 88 with 10% for cuts and waste. 12×24 in: 40 net, buy 44. 8×8 in: about…How Much Paint for a 12x12 Garage?A 12x12 ft single-car garage with 9-ft walls and a 9x7 garage door has about 360 sq ft of net wall after openings — two coats of finish take about 3…How Many Blocks for a 4-Foot Retaining Wall?A 4 ft retaining wall needs about 12 blocks of 4-in-high landscape block per linear foot (48 ÷ 4 = 12 courses); a 20 ft run is about 240 body blocks…How Many Tiles for a 6x8 Kitchen Floor?A 6x8 ft kitchen floor is 48 sq ft: about 48 net 12x12 in tiles (buy 53 with 10% waste), about 24 net 12x24 in tiles (buy 27), or about 109 net 8x8 in…How Much Paint for a 10x10 Room?A 10x10 ft room with 8-ft walls has about 285 sq ft of paintable wall after doors and windows — two coats take about 2 gallons of paint. Add about 1…How Many Bags of Concrete for an 8x8 Slab?An 8x8 ft (64 sq ft) slab poured 4 in thick needs about 21.3 cu ft of concrete — 36 bags of 80-lb mix or 48 bags of 60-lb mix; at 3.5 in, about 32 bags…How Much Paint for a 12x16 Room?A 12x16 ft room with 8-ft walls has about 400 sq ft of paintable wall after doors and windows — two coats take about 3 gallons of paint. Painting the…How Much Gravel for a 4x8 Shed Base?A 4x8 ft shed needs about 15 cu ft of crushed stone for its gravel base: with a 6-in border that's 45 sq ft at 4 in deep, or roughly 0.6 cu yd - about…How Many Bags of Concrete for a 10x10 Patio?A 10×10 ft (100 sq ft) patio slab at 4 in thick needs about 33.3 cu ft of concrete — 56 bags of 80-lb or 75 bags of 60-lb mix. At 3.5 in thick it's…How Much Gravel for a 12x16 Patio?12x16 ft (192 sq ft) gravel patio needs about 80 cu ft of gravel: a 48 cu ft base of 3/4-in crushed stone plus a 32 cu ft pea gravel surface - roughly…How Many Tiles for a 12x14 Bedroom Floor?A 12×14 ft (168 sq ft) bedroom floor takes about 168 12×12-inch tiles net, or buy 185 with 10% waste; 12×24 needs about 84 net (buy 93); 18×18 needs…
02 Painting & Walls
Paint CalculatorFree paint calculator: how many gallons of paint do I need? Includes doors, windows, coats, coverage table an…Wallpaper CalculatorFree wallpaper calculator: how many double rolls do I need? Includes pattern repeat waste and cost estimate.Drywall CalculatorFree drywall calculator: how many sheets for walls and ceiling? Includes screws and joint compound estimates.Insulation CalculatorFree insulation calculator: how many batts and what R-value for walls and attics?Siding CalculatorFree siding calculator: how many squares of vinyl or fiber cement? Includes openings and waste.
03 Flooring & Tiles
Stair Carpet CalculatorFree stair carpet calculator: how much carpet do I need for stairs? Enter steps, tread depth, riser height and stair…Ceiling Tile CalculatorFree drop ceiling tile calculator: how many 2x2 or 2x4 suspended ceiling tiles do I need? Enter room size and waste %…Epoxy Garage Floor Calculator – How Much Do I Need?Free epoxy garage floor calculator: how many kits of epoxy paint do I need for a garage? Enter length, width, coats a…Stair Carpet CalculatorFree stair carpet calculator: how much carpet do I need for stairs? Enter step count, tread depth, riser height and c…Backsplash Tile CalculatorFree backsplash tile calculator: how many tiles do I need? Enter your countertop length and height — instant counts f…Tile CalculatorFree tile calculator: how many tiles and boxes do I need for a floor or wall? Includes waste allowance and co…Flooring CalculatorFree flooring calculator: how many boxes of laminate, vinyl or hardwood do I need? Includes waste allowance a…Carpet CalculatorFree carpet calculator: how much carpet for any room? Square feet, yards and cost estimate.Grout CalculatorFree grout calculator: how much grout for your tile job? Works for any tile size, gap and thickness.
04 Concrete & Masonry
Concrete Slab Cost CalculatorEstimate concrete slab costs for patios, shed pads and floors: materials per sq ft, cubic yards needed, plus base pre…Retaining Wall Block CalculatorFree retaining wall block calculator: how many blocks do I need? Enter wall length, height and block size to get rows…Post Hole Concrete CalculatorFree post hole concrete calculator: estimate hole volume and how many 60 lb or 80 lb bags you need for fence, deck an…Countertop CalculatorFree countertop calculator: measure straight, L-shaped or U-shaped kitchens and get total square footage, slab count…Concrete CalculatorFree concrete calculator: cubic yards and bags needed for slabs, patios and footings. Includes bag math and c…Brick CalculatorFree brick calculator: how many bricks for a wall? Includes mortar estimate.Paver CalculatorFree paver calculator: how many pavers for a patio or path? Includes waste and base materials.
05 Wood & Deck
Fence Stain CalculatorFree fence stain calculator: how many gallons of stain do I need for a fence? Enter fence length, height, sides and c…Stair Tread & Riser CalculatorFree stair tread and riser calculator: how many steps do I need for any total rise? Step count, actual riser height i…Shiplap CalculatorFree shiplap calculator: how many boards do I need for a wall? Enter wall length and height, pick a board width and l…Baluster Spacing CalculatorFree baluster spacing calculator: how many balusters do I need for a railing? Enter run length and max gap — instant…Wall Studs CalculatorFree wall studs calculator: how many studs do I need for a wall? Enter wall length, pick 16 in or 24 in on-center spa…Baseboard CalculatorFree baseboard calculator: how many sticks of baseboard do I need? Enter room length, width, doors, waste and board l…Board Foot CalculatorFree board foot calculator: lumber volume for any board size. Includes price per board foot.Deck Boards CalculatorFree deck board calculator: how many boards for any deck size? Includes gaps and waste.Deck Stain CalculatorFree deck stain calculator: how many gallons of stain for any deck? Includes coats, coverage and cost.Rafter CalculatorFree rafter calculator: rafter length by span and pitch, with overhang and count.Stair Stringer CalculatorFree stair stringer calculator: risers, treads and stringer length for code-safe stairs.
06 Outdoor & Landscape
Pond Liner CalculatorFree pond liner calculator: what size liner do I need? Enter pond length, width and depth to get the exact liner dime…Landscape Edging CalculatorFree landscape edging calculator: how many feet of edging do I need? Works for rectangular, round and free-form beds,…Raised Bed Soil CalculatorFree raised bed soil calculator: how much soil do I need? Enter bed length, width and height for cubic feet, cubic ya…French Drain Gravel CalculatorFree French drain gravel calculator: how much gravel do I need? Enter trench length, width and depth to get cubic yar…Chain Link Fence CalculatorFree chain link fence calculator: estimate mesh rolls, line posts, terminal posts, top rails and gate posts for any y…Fire Pit Block CalculatorFree fire pit block calculator: how many blocks for a 3 ft, 3.5 ft or 4 ft fire pit? Enter inner diameter, block leng…Grass Seed CalculatorFree grass seed calculator: how much grass seed do I need for a new lawn or overseeding? Enter your lawn size in squa…Pool Volume CalculatorFree pool volume calculator: how many gallons of water is in my pool? Works for rectangular, round and oval pools usi…Mulch CalculatorFree mulch calculator: how many bags or cubic yards of mulch do I need? Includes depth and cost estimate.Gravel CalculatorFree gravel calculator: cubic yards, tons and bags for paths and driveways. Includes depth guide and cost.Sod CalculatorFree sod calculator: how many rolls or slabs of sod for a new lawn? Includes waste and cost estimate.Topsoil CalculatorFree topsoil calculator: cubic feet, yards and bags for any garden or lawn.Plant Spacing CalculatorFree plant spacing calculator: how many plants fit your garden, grid or staggered.Gutter CalculatorFree gutter calculator: linear feet of gutter and downspouts for any roof.Fence CalculatorFree fence calculator: how many pickets, posts and rails do I need? Enter your fence length, picket width and…
07 HVAC & Water
Solar Panel CalculatorFree solar panel calculator: how many panels do I need? Enter your monthly kWh, panel wattage and peak sun hours to g…Mini Split Sizing Calculator – What Size Do I Need?Free mini split sizing calculator: what size mini split do I need? Get a BTU recommendation from room area, ceiling h…Generator Size CalculatorFree generator size calculator: pick the appliances you want to power and see total running watts, the largest starti…Btu CalculatorFree BTU calculator: what size AC for any room? Includes sun exposure and people adjustments.Ceiling Fan Size CalculatorFree ceiling fan size calculator: blade span by room size, plus mounting advice.Water Heater Size CalculatorFree water heater size calculator: tank gallons by household size and usage.