Concrete planning tool
Concrete Curb Calculator
Estimate concrete for one straight curb with a uniform rectangular cross-section using dimensions you supply.
Curb inputs
Enter the curb dimensions
Enter one straight curb with a uniform rectangular cross-section.
Concrete required
Concrete volume for this curb
Concrete required
0.51yd³
- Cross-section area
- 0.25 ft²
- Volume before waste
- 0.46 yd³
- Waste allowance
- 0.05 yd³
- Including waste
- 0.51 yd³
Estimating packaged concrete? Use the Concrete Bag Calculator.
Live diagram
Curb visualization
Diagram shows relative proportions, not scale.
How it works
From curb dimensions to concrete volume
The calculator finds the rectangular cross-section from curb width and height, extends it along the curb length, and adds your waste allowance.
Rectangular curb formula
Convert width and height to compatible units, multiply them for the cross-section, then multiply by curb length.
Cross-section area = width × height
Required concrete = length × width × height × (1 + waste percentage ÷ 100)
Worked example: 50 ft × 6 in × 6 in
This arithmetic example models a uniform rectangular curb and is not a sizing recommendation.
- Cross-section area0.25 ft²
- Before waste12.5 ft³ / 0.46 yd³
- 10% waste1.25 ft³ / 0.05 yd³
- Concrete required0.51 yd³
Understanding curb width and height
Width measures across the curb profile. Height measures vertically through that same uniform rectangular profile. Enter dimensions from your project plan or other appropriate guidance.
Waste allowance
Waste is shown separately and added after the base curb volume. No universal allowance is assumed.
Cubic feet, cubic yards, and cubic meters
US results emphasize cubic yards. Metric results use cubic meters. Switching systems preserves the same physical curb and calculation precision.
Estimate limitations
This calculator models one straight, continuous curb with a uniform rectangular cross-section. It does not model road curb profiles, gutters, slopes, curves, transitions, multiple sections, reinforcement, forms, excavation, base material, labor, pricing, structural design, or code compliance.
Use project plans, local requirements, and qualified professional guidance where required.
Frequently asked questions
- How much concrete do I need for a curb?
- Multiply the curb length by its rectangular width and height, then add your selected waste allowance.
- What dimensions should I enter?
- Enter the full curb length and the uniform width and height of its rectangular cross-section.
- Can this calculate landscape edging?
- Yes, when the edging is a straight concrete section with a uniform rectangular profile. Curves and changing profiles are not included.
- Does it include reinforcement?
- No. Reinforcement selection and structural design are outside this material-volume estimate.
- Does it include forms?
- No. Form dimensions, materials, and labor are not calculated.
- Should I add waste?
- Use the allowance appropriate for your placement and project conditions; the calculator does not prescribe one.
- Can it calculate bags?
- Use the Concrete Bag Calculator with this required volume and the product’s stated yield.
- Can it calculate road curbs?
- No. Engineered road curb, curb-and-gutter, gutter pans, and sloped profiles are outside this simple rectangular model.