Pour Ready
Curb guide

Start with the approved cross-section and split every transition

Curb quantity is a linear calculation only while the section remains uniform. Returns, inlets, tapers, and driveway cuts end that assumption.

Published June 12, 2026 · 6 minute read
Quick answer: Curb and gutter volume = run length × (curb area + gutter area), where curb area = curb width × curb height and a sloped gutter pan averages its inside and outside thickness. The linear method only holds while the cross-section stays uniform — measure driveway cuts, curb ramps, inlets, returns, and transitions as separate segments, using the approved municipal or project detail as the input source.

Calculate cross-sectional area first

Pour Ready combines a rectangular curb area with either a uniform rectangular gutter or a sloped trapezoidal gutter. Multiply the combined area by the run length.

Volume = length × (curb area + gutter area)
Curb area = curb width × curb height
Sloped gutter area = gutter width × (inside thickness + outside thickness) ÷ 2

Keep curb height in the intended vertical unit and gutter dimensions in inches or centimeters as shown by the calculator. Unit mistakes are especially easy when field details mix feet and inches.

Use the standard drawing as the input source

Municipal, development, or DOT details may prescribe curb face, width, gutter pan, slopes, reinforcement, base, joints, concrete, and finish. Enter those dimensions rather than selecting a convenient generic profile. Right-of-way work commonly requires permits and inspection.

Separate every nonuniform segment

Driveway depressions, curb ramps, catch basins, inlet throats, transitions, curb returns, radii, tapers, and terminations change the cross-section. Measure each as a separate segment or use the quantity method specified by the project. Do not apply one full-height section through a driveway cut and assume waste will correct it.

Curves change length, not necessarily section

If the cross-section stays constant around a radius, measure the arc length along the project’s designated reference line. Clarify whether plan dimensions follow the curb face, back of curb, gutter flow line, or centerline. Long radii can create a meaningful length difference between those lines.

Placement method affects allowance

Machine-placed curb, hand-formed curb, short interrupted sections, and combined curb-and-gutter pours have different losses and logistics. Pump or machine priming, form leakage, rejected material, cleanup, and frequent starts can matter more than the simple geometry suggests. Choose waste based on placement method and project history.

Drainage is a geometry requirement

The gutter must carry water to the intended outlet without creating low points. Confirm grades, inlet elevations, transitions, and tie-ins before concrete. A correct cubic-yard estimate does not fix an incorrect flow line.

Takeoff rule: one calculator entry per uniform cross-section and reference-line length. Transitions deserve their own line item.