Concrete curb and edging calculator
Pick the curb type, enter its cross-section and the total length to see the concrete per foot and for the whole run.
Enter your measurements
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)
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
- Total to buy counts this as ready-mix. Switch “How will you buy it?” to bags if you are mixing it yourself.
Quick answers for common sizes
| Example | Answer |
|---|---|
| How much concrete for curb and gutter | 1.75 cu ft per foot; 7.13 cu yd per 100 ft with 10% extra |
Your curb at other lengths
| Total length | Concrete to order | Or bags of mix (incl. extra) | Weight of the concrete (≈ 145 lb/cu ft) |
|---|---|---|---|
| 10 ft | 0.71 cu yd | 33 bags | 2,538 lb |
| 25 ft | 1.78 cu yd | 81 bags | 6,344 lb |
| 50 ft | 3.56 cu yd | 161 bags | 12,688 lb |
| 100 ft | 7.13 cu yd | 321 bags | 25,375 lb |
| 200 ft | 14.3 cu yd | 642 bags | 50,750 lb |
A curb is a long prism, so the concrete is its cross-section area × length. For curb and gutter, add the rectangle of the curb to the rectangle of the gutter pan. Curb dimensions for streets and commercial lots come from the local standard detail or your plans; landscape edging is whatever looks right in the garden.
cu ft per foot = width (in) × height (in) ÷ 144 curb and gutter = curb section + gutter width × gutter thickness cubic yards = cu ft per foot × length ÷ 27
| Profile | Cu ft per ft | Feet per cubic yard | Feet per 80 lb bag |
|---|---|---|---|
| Mow strip 6 × 4 in | 0.17 | 162 | 3.6 |
| Edging 6 × 6 in | 0.25 | 108 | 2.4 |
| Curb 6 × 18 in | 0.75 | 36 | 0.8 |
| Curb 6 × 18 + gutter 24 × 6 in | 1.75 | 15.4 | 0.34 |
A worked example for a common curb-and-gutter section is on how much concrete for curb and gutter.
Tips
- Curbs crack where they want to unless you give them joints. Tool or saw control joints at regular intervals along the run, and leave expansion joints where the curb meets a slab or structure, as your local standard shows.
- For long runs, ready-mix delivered straight into slip forms or a curbing machine is far faster than bags.
- Slope the gutter pan toward drains as the plans show; even a perfect volume estimate won’t fix a gutter that holds water.
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) - 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) - 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) - Portable electric concrete mixerPremium price
A small drum mixer turns a long day of hand-mixing into batches of two or three 80 lb bags. Check the drum size against the bag count you need.
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 per foot of curb?
Width × height in inches ÷ 144. A 6 × 18 in curb is 0.75 cu ft per foot, so 36 ft uses a cubic yard. Add the gutter pan if there is one.
How much concrete for landscape curbing?
A 6 × 4 in mow strip is about 0.17 cu ft per foot — roughly 160 ft per cubic yard, or 3½ ft per 80 lb bag before waste.
Do I need rebar in a curb?
It depends on the use and your local standard. Street curbs follow the city’s detail; garden edging usually has none. The calculator counts concrete only.
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.