Home projects
Estimate concrete or gravel from the space you need to fill.
Measure the project, choose the material, and see volume plus a practical buying estimate with waste and product assumptions kept visible.
Your estimate
Material needs will appear here.
Enter the dimensions and depth, then adjust the waste and product assumptions.
Bags to buy
Estimated weight
Cubic feet
Cubic meters
How the volume was calculated
Volume comes first
Rectangles use length times width times depth. Circles use pi times radius squared times depth. Keep every dimension in compatible units before multiplying.
Why bag counts round up
You cannot normally purchase a fraction of a bag, so the result rounds up after adding waste. Product yield can vary with the mix and consistency.
Volume is not weight
Gravel is usually measured by volume for the space and by weight for delivery. Density connects the two, but stone type, grading, moisture, and compaction can change the actual weight.
Confirm the product before ordering
QUIKRETE lists approximate yields of 0.30 cubic feet for a 40-pound bag, 0.45 for a 60-pound bag, and 0.60 for an 80-pound bag of Concrete Mix. Check the manufacturer's concrete mix data and your supplier's gravel density, minimum order, and delivery rules.
Worked example: a 10-by-10-foot slab at 4 inches thick is about 33.3 cubic feet before waste. The number of bags or the delivered gravel weight depends on the product yield or density you enter, so use the supplier’s current specification.
This calculator is a material-planning estimate, not structural or site-preparation advice. Confirm required thickness, base preparation, reinforcement, drainage, mix selection, compaction, and local requirements with a qualified professional or supplier. Method and source link reviewed September 29, 2026.
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