Concrete Calculator

Use this Concrete Calculator to estimate how much concrete you need for slabs, columns, footings, walls, stairs, curbs, gutters, and barriers. Enter your dimensions, quantity, and material details to calculate concrete volume, bag requirements, estimated weight, and total cost instantly.

Concrete Form

Currency

Enter prices in the currency selected here. No exchange-rate conversion is performed.

Quantity

Number of identical forms or sections.

Dimensions

Length

Width

Thickness

Choose a unit beside each dimension. Units can be mixed; the calculator converts them internally.

Pre-Mixed Concrete

Concrete Density (kg/m³)

Typical normal-weight concrete is about 2,400 kg/m³.

Bag Size

Waste Allowance (%)

A 5–10% allowance is often used for planning.

Cost Per Bag ($)

Bag yield is an estimate based on bag weight, not a manufacturer guarantee. Use the yield printed on your product packaging for more accurate ordering.

Your Concrete Estimate

Volume per Form—

Total Concrete Volume—

Volume Including Waste—

Estimated Concrete Weight—

Estimated Bag Yield—

Bags Needed—

Cost Per Bag—

Cost Per Form—

Cost Per Unit Area—

Cost Per Unit Volume—

Estimated Total Cost—

Estimates exclude labor, delivery, taxes, reinforcement and equipment.

How to Calculate Concrete Volume

To estimate the amount of concrete required, measure the dimensions of your project and select the appropriate concrete form. The calculator uses these measurements to estimate the total volume, concrete weight, number of pre-mixed bags, and material cost.

For the best estimate, measure carefully and include a reasonable allowance for waste. Actual concrete requirements may vary depending on the shape of the project, ground conditions, and the product you choose.

Examples

Example 1: Concrete Slab

Suppose you are preparing a slab that is 10 feet long, 10 feet wide, and 4 inches thick. The calculator estimates the concrete volume at approximately 1.23 cubic yards before adding waste.

Example 2: Concrete Bags

If your project requires approximately 1 cubic yard of concrete, selecting an 80 lb bag will help estimate how many bags you need. The final quantity depends on the yield stated on the bag.

Example 3: Concrete Cost

Enter your local price per bag and select a waste allowance. The calculator estimates the total material cost, cost per form, cost per unit area, and cost per unit volume.

Disclaimer: These results are estimates for planning purposes only. Bag yields, concrete density, and material prices vary by manufacturer and location. Confirm the product specifications and project measurements before purchasing concrete. Labor, delivery, taxes, reinforcement, and equipment are not included.

Concrete Calculator