Concrete Mix Calculator
Plan DIY concrete mixes with exact cement, sand, and aggregate ratios. Supports 1:2:3, 1:2:4, and custom ratios.
Frequently Asked Questions
What is the standard concrete mix ratio?
A standard 1:2:3 mix is 1 part cement, 2 parts sand, 3 parts gravel by volume. It yields roughly 3,000 PSI concrete.
How much water per bag of cement?
Aim for a water-cement ratio of 0.45 to 0.55 by weight. About 5 to 6 gallons per 94 lb bag of Portland cement.
What mix ratio for a concrete slab?
Use a 1:2:3 mix for most residential slabs. Use 1:2:4 for non-structural work like garden pads.
Related Pages
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Calculate concrete needed for a slab. Enter length, width, and thickness to get cubic yards, bags of pre-mix, and cost.
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Estimate total concrete cost. Enter volume and local price per cubic yard to get project cost including delivery and labor.
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Calculate how many cubic yards of concrete you need. Works for slabs, footings, columns, and custom shapes.
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Calculate concrete needed for footings. Enter dimensions, depth, and quantity for accurate volume and bag estimate.
Concrete Column Calculator
Calculate concrete for round or square columns and posts. Enter diameter, side length, height, and quantity.
Concrete Stairs Calculator
Calculate concrete needed for stairs. Enter number of steps, riser height, tread depth, and width for exact volume.