Concrete Curb Calculator

When to use this calculator

Use this concrete curb calculator for landscape curbing, mow strips, driveway edging, garden borders, and small site concrete where the shape is close to a long rectangular strip. The calculator turns curb length, width, and height into cubic yards, then adds waste and cost.

• Landscape curbing along beds, sidewalks, driveways, and lawn edges.
• Mow strips where the width and height are fairly consistent.
• Straight or gently curved forms where total measured length is known.
• Early budgeting for concrete volume, delivery minimums, and material cost.

Input guide

• Curb length is the total run along the centerline of the curb or edging.
• Curb width is the average top-to-bottom form width in inches.
• Curb height is the average formed height in inches.
• Waste factor covers form irregularity, spillage, over-excavation, and cleanup.
• Concrete price should match your local bagged mix or ready-mix cost per cubic yard.

Formula and estimation method

Step-by-step worked example

An 80 ft curb that is 6 inches wide and 6 inches high uses 80 x 0.5 x 0.5 = 20 cubic feet. Divide by 27 to get about 0.74 cubic yards. With 10% waste, plan about 0.81 cubic yards. At $160 per cubic yard, the concrete estimate is about $130 before forms, base, reinforcement, color, delivery, or tools.

Before you order materials

Use the Concrete Curb Calculator result as a starting quantity, then convert it into the way your supplier actually sells the material. Some stores sell by bag, each, pallet, strap, ton, cubic yard, or delivered load. Ask whether the quoted price includes delivery, fuel surcharge, pallet deposit, short-load fee, tax, unloading limits, or return rules. For outdoor projects, also check access for trucks, where material can be staged, whether the ground is firm enough for delivery, and how long the work area can stay open if weather changes.

For a safer order, write down the measurements used in the calculator, the waste percentage, the product size or density, and the final rounded quantity. Bring those notes to the supplier or contractor so they can catch unit mistakes before money is spent. If the project affects drainage, support, vehicle traffic, steps, walls, posts, or anything inspected by code, treat the calculator as a planning aid and verify the final material list with a qualified local source.

Common mistakes to avoid

• Measuring only one straight section and forgetting returns, curves, and short side pieces.
• Entering inches as feet for width or height.
• Forgetting that decorative curbs, thickened edges, or haunches need more concrete than a simple rectangle.
• Ordering below a ready-mix supplier minimum and being surprised by short-load fees.
• Skipping expansion joints or control joints where movement is expected.

Planning notes and limitations

• Measure curves with a flexible tape, wheel, or string along the planned curb path.
• For decorative curbing, ask the installer or supplier for the actual cross-section area.
• Plan form stakes, release, finishing tools, joints, and curing before the pour starts.
• If the curb holds back soil or vehicle loads, get proper design guidance instead of treating it as simple edging.

This is a planning estimate for material quantity. Follow local code, site drainage requirements, accessibility rules, and professional guidance for curbs that affect traffic, drainage, retaining, or structural support.