Volume formula
Volume = length × (curb area + gutter area)
Curb area = curbWidth × curbHeight
Gutter area = gutterWidth × (thick_curb + thick_edge) ÷ 2
Concrete planning estimate
Concrete Curb and Gutter Calculator
Calculate concrete volume for curb and gutter sections. Enter the run length, curb height, curb width, and gutter width to get cubic yards and bag count using the curb-plus-trapezoid cross-section formula.
What the curb and gutter calculator estimates
The calculator models the curb and gutter as a composite cross-section: a rectangular curb face plus a trapezoidal gutter pan. Enter length, curb height, curb width, gutter width, and gutter thickness to get a volume estimate.
- Concrete volume in cubic yards (imperial) or cubic meters (metric).
- Bag count for reference (ready-mix is typical for curb work).
- Cross-section formula breakdown.
- Ready-mix recommendation for commercial-scale pours.
- Key assumptions and limitations.
Curb and gutter volume formula
The formula models a uniform curb-and-gutter cross-section along the full run length.
Units
Length and curb height are in feet. Curb width, gutter width, and gutter thicknesses are in inches. The calculator converts all dimensions to a consistent unit before computing.
Limitations
Does not account for curb returns, driveway cuts, radius curves, or tapered transitions at intersections. Add extra material for these features.
Curb and gutter calculator FAQ
How much concrete does 100 linear feet of curb and gutter need?
A standard curb and gutter (6 in curb height, 6 in curb width, 12 in gutter width) over 100 linear feet needs about 1.4–1.8 yd³ depending on cross-section profile. Use the calculator for your specific dimensions.
What PSI concrete is used for curb and gutter?
4000 psi (M300) is the standard for curb and gutter in most municipal specifications. Exterior concrete exposed to freeze-thaw cycles should include air entrainment.
What is a standard curb and gutter cross-section?
A common residential curb and gutter is 6 in high × 6 in wide with a 12–18 in wide gutter that tapers from 4 in at the curb face to 3 in at the outer edge. Dimensions vary widely by municipality.
Do I need permits for curb and gutter work?
Yes — curb and gutter work in public right-of-way typically requires a municipal encroachment permit or right-of-way permit. Private driveway curb cuts require approval from the local authority.
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Next planning steps
Planning estimates only
These are rough material estimates for planning purposes. Local DOT or municipality standards may specify required curb profiles, concrete strength, air entrainment, and joint spacing. Verify specifications before ordering. Work in public right-of-way requires permits and may need inspector approval.