Construction Calculators
Free construction calculators to estimate concrete, bags of mix, blocks and gravel for a slab, wall, path or driveway. Feet, inches or meters. No sign-up.
2 Calculators
All Construction Calculators
Construction Calculators Explained
Buying too little material delays a job, and buying too much wastes money. Our construction calculators turn the size of your project into an amount to order. The Concrete Calculator gives the volume of a slab, footing, wall or column in cubic yards or cubic meters, the number of bags of dry mix, and how many concrete blocks a wall needs. The Gravel Calculator gives the volume and weight of gravel, pea gravel, crushed stone or sand for a path, driveway or garden bed.
Both work in feet and inches or in meters and centimeters, add an allowance for waste or settling, and can estimate the cost. Results are estimates to help you plan, so for foundations or structural work, ask a qualified builder or engineer.
Popular construction calculators include Concrete Calculator and Gravel Calculator.
Frequently Asked Questions
Are the construction calculators free to use?
Yes. Every construction calculator on CalculatorEver is free, with no signup. The calculation happens in your browser, and the sizes you enter are not stored or sent to a server.
Which calculator should I use for a patio or shed base?
Use the Concrete Calculator to find how much concrete the slab needs, for example a 10 ft by 10 ft slab that is 4 in thick needs about 1.23 cubic yards. Use the Gravel Calculator for the stone base under it.
Can I use metric units?
Yes. Both calculators let you choose feet and inches or meters and centimeters. A slab 5 m by 4 m and 10 cm thick, for example, is 2 cubic meters of concrete.
How much extra should I order?
Most builders add about 5% to 10% for uneven ground, spillage and settling. Both calculators use 10% by default, and you can change it. For anything structural, get advice from a qualified builder or engineer.
