Key numbers
- Formula: L × (CW × CH + GW × GT), all in feet
- 6 × 18 in curb + 24 × 6 in gutter: 1.75 ft³ per foot, 6.48 yd³ per 100 ft
- Curb only, 6 × 18 in: 2.78 yd³ per 100 ft (36 ft per yd³)
- Weight: about 263 lb per foot of that curb and gutter
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How to use the Concrete Curb Calculator
- 1Pick your unitsEvery dimension has its own unit menu (in, ft, yd, cm or m); changing one converts that number so the size stays the same. The US / Metric switch sets all fields to feet and inches or meters and centimeters and resets them to typical values.
- 2Enter the dimensionsType the length (default feet), curb width (default inches), curb height (default inches), gutter width (default inches) or gutter thickness (default inches). Measure the inside of the forms and the depth in several places.
- 3Set waste and quantityUse the waste slider (0 to 20%, default 10%) and allow more on uneven ground. If you have several identical pours, enter how many.
- 4Read the resultsSee the volume in cubic yards, cubic feet and cubic meters, the ready-mix order rounded up to ¼ yard, the number of 90, 80, 60, 50 and 40 lb bags rounded up, and the weight at the density you choose (150, 145 or 140 lb/ft³).
- 5Price it and save itPick a pricing basis (per cubic yard, per cubic meter or per bag of the highlighted size) and enter your local price for a material cost. Use Add to project to total several pours, and Copy link to share the exact result.
Results update as you type. Back to the calculator ↑
How to calculate concrete for a curb
A curb is a long prism, so its volume is the cross-section area times the length. The calculator models a rectangular curb with a flat gutter pan in front of it, both running the full length:
Volume (ft³) = length (ft) × (curb width × curb height + gutter width × gutter thickness)
Enter curb and gutter dimensions in inches and the calculator converts them. Divide cubic feet by 27 for yards. For a curb with no gutter, set the gutter width to 0.
- Get the profile. For street work, use the city or DOT standard drawing. For a driveway or landscape curb, measure the form.
- Measure the length along the face of the curb, including returns.
- Run the numbers above. Results include yd³, ft³, m³, bags and weight.
- Add 10% and round up to the next ¼ yd³.
Worked example: 100 ft of curb and gutter
- Curb: 6 in × 18 in = 0.5 × 1.5 = 0.75 ft² per foot
- Gutter: 24 in × 6 in = 2 × 0.5 = 1.0 ft² per foot
- Per foot: 1.75 ft³; 100 ft = 175 ft³ = 6.48 yd³
- With 10% extra: 7.13 yd³ → order 7¼ yd³
Real curb profiles have a batter (sloped face) and rounded corners, which remove a little concrete. Treating the curb as a rectangle overstates it slightly, which works in your favour when ordering.
Concrete per 100 ft of curb and gutter
Common profiles, per 100 linear feet. “Order” includes 10% extra rounded up to ¼ yd³.
| Profile | ft³ per 100 ft | yd³ per 100 ft | Order (+10%) | yd³ per linear ft | Linear ft per yd³ |
|---|---|---|---|---|---|
| Curb 6 × 12 in, no gutter | 50 | 1.85 | 2¼ | 0.019 | 54 |
| Curb 6 × 18 in, no gutter | 75 | 2.78 | 3¼ | 0.028 | 36 |
| Curb 6 × 24 in, no gutter | 100 | 3.70 | 4¼ | 0.037 | 27 |
| Curb 12 × 18 in, no gutter | 150 | 5.56 | 6¼ | 0.056 | 18 |
| 6 × 18 in curb + 12 × 6 in gutter | 125 | 4.63 | 5¼ | 0.046 | 21.6 |
| 6 × 18 in curb + 18 × 6 in gutter | 150 | 5.56 | 6¼ | 0.056 | 18 |
| 6 × 18 in curb + 24 × 6 in gutter | 175 | 6.48 | 7¼ | 0.065 | 15.4 |
| 6 × 18 in curb + 24 × 8 in gutter | 208.3 | 7.72 | 8½ | 0.077 | 13 |
| 6 × 18 in curb + 30 × 6 in gutter | 200 | 7.41 | 8¼ | 0.074 | 13.5 |
| 6 × 24 in curb + 24 × 8 in gutter | 233.3 | 8.64 | 9¾ | 0.086 | 11.6 |
These profiles are examples for the arithmetic, not standards. Every city and state DOT publishes its own curb and gutter details, so take the dimensions from the drawing that applies to your street.
Landscape curbing
Decorative landscape curbing is a small extruded or hand-formed edge, usually a few inches tall. It uses far less concrete than a street curb, so bags are often enough.
| Profile (width × height) | ft³ per 100 ft | yd³ per 100 ft | 80 lb bags (+10%) | 60 lb bags (+10%) |
|---|---|---|---|---|
| 4 × 4 in | 11.1 | 0.41 | 21 | 28 |
| 6 × 4 in | 16.7 | 0.62 | 31 | 41 |
| 6 × 5 in | 20.8 | 0.77 | 39 | 51 |
| 8 × 6 in | 33.3 | 1.23 | 62 | 82 |
Extruded curbing machines need a specific mix; follow the machine maker’s guidance rather than a standard bag mix.
Metric curb volumes
In metric, multiply length in metres by the cross-section in square metres. A 15 × 45 cm curb with a 60 × 15 cm gutter is 0.15 × 0.45 + 0.60 × 0.15 = 0.1575 m² per metre, so 100 m needs 15.75 m³. A 15 × 30 cm curb with no gutter needs 4.5 m³ per 100 m. Switch the calculator to Metric to enter centimetres and metres directly.
Weight and removal
At 150 lb/ft³, a 6 × 18 in curb with a 24 × 6 in gutter weighs about 263 lb per foot, so 100 ft is roughly 26,000 lb (13 tons). A 10 ft repair section is about 2,600 lb of debris. The concrete weight calculator handles other profiles.
Short sections and repairs
Curb repairs are often a single panel between joints. For 10 ft of 6 × 18 in curb with a 24 × 6 in gutter, the volume is 17.5 ft³: 33 bags of 80 lb concrete with 10% extra. A 40 ft section across a driveway frontage is 2.59 yd³ (order 3 yd³), where a small ready-mix load beats 129 bags.
Work in the public right-of-way usually needs a permit and must match the city’s detail, including joints and any dowels into the existing curb. Check with the public-works department before cutting or pouring.
Common curb estimating mistakes
- Forgetting the gutter. In the 100 ft example the gutter is 57% of the concrete.
- Using a generic profile. Gutter width and thickness vary a lot between cities; one extra inch of gutter thickness on a 24 in pan adds 0.62 yd³ per 100 ft.
- Missing returns and transitions. Curb returns at corners and driveway cuts add length.
- Mixing up inches and feet. Convert inches to feet (6 in = 0.5 ft) before multiplying, or let the calculator do it.
For foundations and walls use the concrete footing calculator or the concrete wall calculator.
FAQ
Frequently asked questions
How many yards of concrete per linear foot of curb and gutter?
0.065 yd³ per foot for a 6 × 18 in curb with a 24 × 6 in gutter (1.75 ft³). That is 6.48 yd³ per 100 ft, or about 15.4 linear feet per cubic yard. A 12 in gutter drops it to 0.046 yd³ per foot.
How much concrete for 100 feet of curb?
A 6 in wide, 18 in tall curb with no gutter needs 75 ft³, or 2.78 yd³ per 100 ft; order 3¼ yd³ with 10% extra. A 6 × 12 in curb needs 1.85 yd³ and a 6 × 24 in curb 3.70 yd³.
How do you calculate concrete for a curb?
Multiply length by the cross-section area in square feet, then divide by 27 for yards. For a 6 × 18 in curb: 0.5 × 1.5 = 0.75 ft² per foot; add the gutter, 2 × 0.5 = 1 ft². Total 1.75 ft³ per foot.
How much concrete for landscape curbing?
A 6 in wide, 4 in tall landscape curb needs 0.62 yd³ per 100 ft (16.7 ft³), about 31 bags of 80 lb concrete with 10% extra. A 6 × 5 in profile needs 0.77 yd³ per 100 ft.
How many bags of concrete for 10 feet of curb and gutter?
33 bags of 80 lb concrete for 10 ft of 6 × 18 in curb with a 24 × 6 in gutter, including 10% extra. The section holds 17.5 ft³ of concrete.
How much does a foot of concrete curb and gutter weigh?
About 263 lb per foot for a 6 × 18 in curb with a 24 × 6 in gutter (1.75 ft³ at 150 lb/ft³). 100 ft weighs over 13 tons, which matters for removal and hauling.
What size is a standard curb and gutter?
There is no single national size. Cities and state DOTs publish standard drawings with their own curb heights, gutter widths and thicknesses. Get the detail from the local public-works department and enter those dimensions.
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Last reviewed October 12, 2026 by M Bilal. Found an error? Tell us.