Landscape Edging Calculator – How Much Edging? | CalcLoft
Find out exactly how many feet of edging — and how many pieces — you need for a rectangular, round or free-form garden bed or border.
How to measure a garden bed for edging
Edging follows the outside of your bed, so what you actually need is the perimeter — the total distance around it. For a rectangular bed, add the length of all four sides:
Perimeter = (length + width) × 2
For example, a 20 × 10 ft bed has (20 + 10) × 2 = 60 ft of edge. Then add your waste allowance for cuts, joints and curves:
Edging to buy = perimeter × (1 + waste %)
Finally divide by the section length and round up. With a 5% allowance and 6 ft sections, that 20 × 10 ft bed needs 63 ft of edging, which is 11 pieces.
Landscape edging reference table
Quick answers for common bed sizes. The table assumes 6 ft edging sections and a 5% waste allowance.
| Bed shape & size | Perimeter | With 5% waste | Pieces of 6 ft |
|---|---|---|---|
| Rectangular 10 × 10 ft | 40 ft | 42 ft | 7 |
| Rectangular 20 × 10 ft | 60 ft | 63 ft | 11 |
| Rectangular 30 × 20 ft | 100 ft | 105 ft | 18 |
| Round, 10 ft diameter | 31.4 ft | 33 ft | 6 |
How much edging for a 10x10 garden bed?
A square 10 × 10 ft bed has a 40 ft perimeter. With the default 5% extra that is 42 ft, so you need about 7 pieces of 6 ft edging (six full pieces plus one cut). Use the calculator above to check your exact bed — it handles round and irregular shapes too.
Related guides
Landscape edging calculator FAQ
How do I measure an irregular or curved bed?
Lay a flexible tape, a rope or a measuring wheel right along the edge of the bed and read the total length. Add a couple of extra feet for dips and tight curves, then pick "Free-form" and enter that number directly.
What about a round flower bed?
Either measure the diameter straight across the middle and choose "Round" — the calculator uses π × diameter — or measure the distance all the way around the circle and enter it as a free-form length.
Do I really need the 5% extra?
Yes. Edging gets cut at corners, trimmed at joints and needs a little slack to follow curves. 5% covers most beds; for heavily curved or odd-shaped borders, raise it to 10%.
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