How much concrete for curb and gutter?
A 6 × 18 inch curb with a 24 × 6 inch gutter pan takes 1.75 cubic feet of concrete per foot. For 100 feet that is 6.48 cubic yards, or 7.13 cubic yards with 10% extra.
How to work it out
- Section (6 in × 18 in) + (24 in × 6 in) = 1.75 cu ft per foot
- × 100 ft + 10% = 7.13 cu yd ÷ 0.6 cu ft per 80 lb bag = 321 bags
Curb-and-gutter sections vary by city, so treat this as a worked example of the method with a typical-looking profile. Swap in the dimensions from your local standard detail or plans.
Adjust for your project
More options: Extra
- Or bags of mix (incl. extra)
- 321 bags · 80 lb bag
- Concrete per linear foot
- 1.75 cu ft
- Linear feet per bag
- 0.3 ft
- Weight of the concrete (≈ 145 lb/cu ft)
- 25,375 lb (13 tons)
- Total to buy counts this as ready-mix. Switch “How will you buy it?” to bags if you are mixing it yourself.
Curb and gutter (6 × 18 + 24 × 6 in) by length, 10% extra
| Total length | Concrete to order | Or bags of mix (incl. extra) |
|---|---|---|
| 25 ft | 1.78 cu yd | 81 bags |
| 50 ft | 3.56 cu yd | 161 bags |
| 100 ft | 7.13 cu yd | 321 bags |
| 150 ft | 10.7 cu yd | 482 bags |
| 200 ft | 14.3 cu yd | 642 bags |
Breaking the section into rectangles
The profile is two rectangles: the curb, 6 in wide and 18 in tall (part of it below the gutter), and the gutter pan, 24 in wide and 6 in thick. That is 108 + 144 = 252 square inches, or 1.75 sq ft — so every linear foot holds 1.75 cu ft. Real profiles have a sloped face and a rounded top; the rectangles slightly overstate the volume, which your waste allowance would cover anyway.
One hundred feet is 175 cu ft, 6.48 yards; with 10% it is 7.13 yards, one truckload. Curb work is nearly always ready-mix: in bags it would be 321 of the 80 lb size, and a curb poured in short sections from bags shows every seam.
Lighter curbs
A plain 6 × 18 in curb without the gutter is 0.75 cu ft per foot, and a garden mow strip 6 × 4 in is only 0.17. The variants show both. If the curb borders a new driveway or patio, add its slab separately with the concrete calculator, and see how much concrete for 3 steps if the walk ends in steps.
Different size? Use the full Concrete Curb Calculator.
What you’ll need
- Steel form stakesMid-range price
Round steel stakes with nail holes hold slab and curb forms in line. Easier to drive and pull than wooden ones.
See options on Amazon (opens in a new tab) - Aluminum screedMid-range price
A straight, light screed strikes off the concrete level with the forms. A straight 2×4 works too if it really is straight.
See options on Amazon (opens in a new tab) - Concrete edger and groover setBudget price
The edger rounds slab edges so they don’t chip; the groover cuts control joints while the concrete is still soft.
See options on Amazon (opens in a new tab)
As an Amazon Associate we earn from qualifying purchases. Links to products are affiliate links — they cost you nothing extra and help keep these calculators free.
Frequently asked questions
How much concrete for 100 feet of plain curb?
A 6 × 18 inch curb needs 3.06 cubic yards for 100 feet with 10% extra.
How many bags of concrete for 100 feet of landscape edging?
About 31 bags of 80 lb for a 6 × 4 inch mow strip, with 10% extra.
How much concrete for 50 feet of curb and gutter?
3.56 cubic yards with 10% extra.
Sources
- Quikrete Concrete Mix (No. 1101) data sheet (opens in a new tab) — Yields: 40 lb ≈ 0.30, 50 lb ≈ 0.375, 60 lb ≈ 0.45, 80 lb ≈ 0.60, 90 lb ≈ 0.675 cu ft; unit weight ≈ 140 lb/cu ft; for pours 2 in thick or more; 6–9 pints of water per 80 lb bag; control joints every 6–8 ft; cure 5 days at 70 °F or above, 7 days at 50–70 °F; protect from freezing for 48 hours.
- NRMCA Concrete in Practice 31 — Ordering Ready Mixed Concrete (opens in a new tab) — Truck mixers carry 8 to 12 cubic yards (about 6 to 9 m³); order 4–10% more than the plan estimate; a loaded truck weighs about 80,000 lb; fresh concrete can cause severe chemical burns.
- NIST Handbook 44, Appendix C — General Tables of Units of Measurement (opens in a new tab) — 1 cubic yard = 27 cubic feet; 1 cubic foot = 1,728 cubic inches.