Estimate concrete volume and ordering for a uniform curb with a rectangular or sloped gutter pan.
Enter the total run, curb height and width, gutter width, and gutter thickness. Choose a rectangular gutter with uniform thickness or a sloped trapezoid with different thicknesses at the curb and outer edge. The calculator adds the curb and gutter cross-sectional areas, multiplies by length, applies the selected order allowance, and reports yards, bags, ready-mix planning, cost, and formula details.
The formula assumes one uniform section for the entire entered length. Driveway cuts, curb returns, inlets, tapers, depressed curb, catch basins, radii, transitions, and thickened sections should be measured separately. For sloped gutters, enter both edge thicknesses so the trapezoid represents the actual pan rather than relying on a uniform-depth approximation.
Municipal and DOT standard drawings commonly control curb profile, dimensions, reinforcement, base, drainage slope, and concrete requirements. Use the applicable detail as the source of inputs. The calculator estimates material for the geometry entered; it does not select an approved public-works section or account for machine-placement loss, hand-forming waste, or interrupted runs unless included in the waste factor.
Volume equals length × (curb area + gutter area). Curb area is width × height. A sloped gutter uses width × the average of its two edge thicknesses.
With a 6 × 6-inch curb and a 12-inch-wide, 4-inch-thick rectangular gutter, the design volume is about 2.16 cubic yards before waste and about 2.27 cubic yards with 5%.
Read the curb and gutter planning guide for reference lines, transitions, returns, and municipal details.