How much aggregate is needed for 1 m³ of M20 concrete?

About 0.84 m³ (roughly 30 cubic feet, or 1.25 tonnes) of coarse aggregate for 1 cubic metre of M20 (1:1.5:3) concrete, using a dry-volume factor of 1.54.

What size aggregate is used in concrete?

20 mm coarse aggregate is standard for most reinforced concrete; 10 mm or 12 mm is used for thin sections, and 40 mm for mass concrete like PCC.

How do I convert aggregate to tonnes?

Multiply the volume in cubic metres by about 1500 kg/m³ for crushed stone, then divide by 1000 for tonnes.

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Materials

Aggregate Calculator

Find the coarse aggregate (stone, gravel or "metal") for a concrete pour — in cubic feet, cubic metres and tonnes. Choose the grade and volume; we take the aggregate share of the mix after scaling to dry volume.

All materials Concrete Cement Sand Aggregate Brick Plaster Tile Flooring Paint Roofing Steel

Grade & volume

Concrete grade

Wet concrete volume m³

Volume unit

Wastage 5%

Aggregate required—

In cubic metres—

Approx. weight—

Aggregate rate for a cost

Aggregate ₹/cft

₹

How it's calculated

Wet concrete volume is scaled by 1.54 to dry volume, and the aggregate share of the grade ratio is taken. Weight uses a bulk density of about 1500 kg/m³ for 20 mm crushed stone.

Aggregate volume = wet volume × 1.54 × (aggregate share of ratio). Tonnes = m³ × 1.5.

For the cement and sand in the same pour, use the concrete calculator or the sand calculator.

Frequently asked questions

Aggregate for 1 m³ of M20?

About 0.84 m³ (~30 cft, ~1.25 tonnes), before wastage.

What aggregate size?

20 mm for most RCC; 10–12 mm for thin members; 40 mm for mass/PCC concrete.

Does mortar or plaster use aggregate?

No — only cement and sand. Aggregate is for concrete.

Calculated with PropertiesOnline.in — free property & construction calculators · https://propertiesonline.in