# Concrete Calculator

> Free concrete calculators that tell you cubic yards, bags, cost, and whether to buy bags or order a truck.


## Posts

- [Hello world!](https://concretecalculatorusa.com/hello-world/): Welcome to WordPress. This is your first post. Edit or delete it, then start writing!

## Pages

- [Gravel calculator](https://concretecalculatorusa.com/calculators/gravel/): For the compacted gravel or crushed stone base under a slab, driveway, patio or shed.
- [Concrete yardage calculator](https://concretecalculatorusa.com/calculators/concrete-yardage/): Concrete is sold by the cubic yard, but you measure in feet and inches.
- [Concrete stairs calculator](https://concretecalculatorusa.com/calculators/concrete-stairs/): For solid poured steps at a porch, stoop or back door.
- [Concrete slab calculator](https://concretecalculatorusa.com/calculators/concrete-slab/): For patios, shed bases, garage floors, sidewalks and pads. Enter the length, width and thickness of the slab to get cubic yards to order, bag counts and cost.
- [Concrete footing calculator](https://concretecalculatorusa.com/calculators/concrete-footing/): For strip footings under walls and foundations, and square pad footings under posts.
- [Concrete driveway calculator](https://concretecalculatorusa.com/calculators/concrete-driveway/): Driveways are big pours, so the numbers matter.
- [Concrete cost calculator](https://concretecalculatorusa.com/calculators/concrete-cost/): Compare the cost of bagged mix against a ready-mix delivery for your pour.
- [Concrete column and post hole calculator](https://concretecalculatorusa.com/calculators/concrete-column/): For anything round: fence post holes, deck piers, Sonotube and other tube forms, and columns.
- [Concrete bag calculator](https://concretecalculatorusa.com/calculators/concrete-bags/): How many bags of concrete mix to buy for a slab, pad or footing.
- [Terms of use](https://concretecalculatorusa.com/terms/): Effective 2026-10-10. By using this site you agree to these terms.
- [Guides](https://concretecalculatorusa.com/guides/): The thinking behind the calculators. Each guide answers one question, shows the math, and links to the tool that does it for you.
- [Disclaimer](https://concretecalculatorusa.com/disclaimer/): Every result on this site is an estimate of material quantity. Read this before you order.
- [Contact](https://concretecalculatorusa.com/contact/): Found a mistake, want a calculator we do not have, or have a question about the site? Send us a note.
- [Calculators](https://concretecalculatorusa.com/calculators/): Pick the tool that matches what you are pouring.
- [About](https://concretecalculatorusa.com/about/): Free concrete calculators for people in the United States who need to know how much to order before they pour.
- [Home](https://concretecalculatorusa.com/): Enter your measurements and get cubic yards, bag counts and cost for slabs, footings, columns, driveways and stairs.
- [Privacy policy](https://concretecalculatorusa.com/privacy-policy/): Effective 2026-10-10. This policy explains what information the site collects, how it is used, and the choices you have.
- [How to calculate concrete](https://concretecalculatorusa.com/guides/how-to-calculate-concrete/): Concrete is sold by the cubic yard, so every calculation ends the same way: find the volume of the shape in cubic feet and divide by 27.
- [How much extra concrete to order](https://concretecalculatorusa.com/guides/concrete-waste-factor/): Order about 10% more than the math says. That covers uneven ground, forms that bow, spills and the concrete left in the chute and mixer.
- [How many bags of concrete in a yard](https://concretecalculatorusa.com/guides/concrete-bag-yield/): It takes 45 bags of 80 lb concrete mix, 60 bags of 60 lb, or 90 bags of 40 lb to make one cubic yard.
- [Bags vs ready-mix](https://concretecalculatorusa.com/guides/bags-vs-ready-mix/): Under about one cubic yard, bags are usually the practical choice. Above it, a ready-mix truck usually costs less per yard and gives a better pour.


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