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Curb Concrete Calculator
Concrete for curbs, kerbs and edging runs. Enter length, width and height: get cubic yards and bags instantly.
Estimates only. Bag yields per manufacturer specs (80 lb ≈ 0.60 ft³, 60 lb ≈ 0.45 ft³, 40 lb ≈ 0.30 ft³). Ready-mix trucks carry ≈ 10 yd³. Always round up and confirm with your supplier.
Long runs of curb add up fast: 100 ft of 6 by 6 in curb needs 1.02 cubic yards. The free curb concrete calculator below totals any length so your edging, kerb or landscape border order is exact.
How to use the curb concrete calculator
- Measure the total curb length in feet.
- Enter the curb width in inches.
- Enter the curb height in inches.
- Add 10 percent waste: long forms always leak a little.
Formula
Volume = Length × (Width ÷ 12) × (Height ÷ 12) ÷ 27, giving cubic yards.
Practical tips
- 100 ft of 6 in wide by 6 in high curb needs 1.02 cubic yards (46 bags of 80 lb).
- Stake forms every 3 to 4 ft to hold a straight line on long runs.
- Expansion joints every 10 ft stop random cracking.
- A slightly rounded top edge chips less than a sharp one.
Frequently asked questions
How much concrete for 100 ft of curb?
At 6 by 6 inches, 100 ft needs 1.02 cubic yards, or 46 bags of 80 lb mix.
How wide should a concrete curb be?
Six inches wide and 6 inches high suits landscape edging. Road kerbs run bigger.
Bags or ready-mix for curbing?
Over about 2 cubic yards (roughly 200 ft of 6×6 curb), ready-mix is cheaper and far faster.
More in the concrete calculator hub, including stairs and walls.
Worked examples
Example 1: 100 ft, 6×6 in. Volume = 0.93 cubic yards. With 10% waste: 1.02 cubic yards (46 x 80 lb bags).
Example 2: 200 ft, 6×6 in. Volume = 1.85 cubic yards. With 10% waste: 2.04 cubic yards (92 x 80 lb bags).
Curb concrete reference table
6×6 in section. Cubic yards before waste; 80 lb bags include 10% waste.
| Length | Cubic yards | 80 lb bags |
|---|---|---|
| 50 ft | 0.46 | 23 |
| 100 ft | 0.93 | 46 |
| 200 ft | 1.85 | 92 |
More curb questions
How much concrete for 100 feet of curb?
At 6×6 inches, 0.93 cubic yards, or 46 x 80 lb bags with 10% waste.