Curb and Gutter Concrete Calculator

Why This One Is Different

This calculator turns your curb-and-gutter run length and cross-section dimensions into how much concrete to order for the pour. Municipal curb-and-gutter sections are a cross-section extruded down a street, and no two cities draw that cross-section the same way. A curb paired with a 12-inch-wide, 6-inch-thick gutter pan is common but not universal. Under the hood, this tool multiplies your combined cross-sectional area by run length to get volume, the same closed-form approach an estimator would use on any linear concrete element, then applies the standard ordering allowance for form deflection and spillage. Pull your actual dimensions from the municipal standard drawing for your project, not from a generic default, before you place an order.

Where the Numbers Come From

• Curb and gutter poured together use more concrete per foot than either piece alone, and it's an exact number, not a guess: combined volume is (curb cross-section + gutter cross-section) × run length, a closed-form extrusion calculation, not an estimate. Source: worked example, closed-form geometry
• NRMCA guidance is to order 4-10% more than plan-derived volume for any formed pour, applying equally to linear curb-and-gutter runs as to slabs. Source: NRMCA, CIP 8, Discrepancies in Yield (2021 reprint)
• Municipal curb-and-gutter cross-section dimensions vary by jurisdiction's standard drawing. There is no single national default, so entering your project's actual spec matters more here than on most calculators. Source: trade convention, labeled as such (not codified in a standard)