Concrete and Driveway Calculators
Get cubic yards right before the truck is on the way.
Concrete is ordered in cubic yards, and shorting a pour is expensive. These calculators convert slab dimensions into volume, optional bag counts for small jobs, and a material cost range. Driveway estimates add a surface-type choice (concrete, asphalt, or gravel) with typical installed or material unit prices you can edit. They do not design reinforcement, base prep, drainage, or control joints. For structural slabs and city-right-of-way work, use an engineer or a contractor who will take responsibility for the mix and the base.
Calculators
Concrete
Concrete Calculator
Slab dimensions to cubic yards and bag counts.
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Concrete
Driveway Calculator
Driveway area, volume, and cost range by surface type.
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How to measure
Measure length and width of the slab or drive. Thickness for sidewalks is often 4 inches; driveways are commonly 4–6 inches over compacted base. Convert inches to feet in the formula (we do that for you). Irregular pads should be split into rectangles. Add a waste factor for over-excavation and spillage; 5–10% is common.
Related categories
FAQ
- How many 80-pound bags equal a cubic yard?
- An 80-pound bag of concrete mix is typically about 0.60 cubic feet. A cubic yard is 27 cubic feet, so you need about 45 bags per yard before waste. Ready-mix is usually cheaper and more consistent above a few bags.
- Can I pour a driveway from bags?
- You can, but a two-car drive is many yards of concrete. Bag mixing is realistic for posts, pads, and small repairs. For a full driveway, ready-mix plus proper base is the usual path.