Gutter Calculator – How Much Gutter Do I Need? | CalcLoft
Find out how many linear feet of gutter and downspouts your house needs.
How much gutter do I need?
Measure the roof edge length (the eave line where gutters mount). A typical house has two long edges. For a 40 ft edge on both sides: 80 linear feet of gutter. Plan one downspout per 30-40 ft of run.
Linear feet by house size
| House footprint | Gutter (approx) | Downspouts |
|---|---|---|
| 1,000 sq ft | ~100-120 ft | 3-4 |
| 1,500 sq ft | ~120-150 ft | 4 |
| 2,000 sq ft | ~150-180 ft | 4-5 |
| 2,500 sq ft | ~180-220 ft | 5-6 |
Full material list
- Gutter sections (10 ft lengths)
- Inside/outside corner pieces
- End caps and hangers (1 per 2 ft)
- Downspout + elbows + extensions
Gutter calculator FAQ
How much does gutter installation cost?
Seamless aluminum runs $4-10 per linear foot installed; DIY sectional runs $2-5 per ft in materials.
How far apart should downspouts be?
Every 30-40 feet of gutter, plus one at each side of a valley.
5-inch or 6-inch gutters?
5-inch is standard. 6-inch handles more water and suits steep roofs or heavy-rain regions.
Not sure which calculator you need?
Browse all free home improvement calculators in one place.