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Grain Storage Volume Calculator

Works out how much grain a store or heap holds, by volume and by weight.

For a flat store or ridged heap.

For a flat store or ridged heap.

For a conical pile.

kg/m³

Bulk density varies with the grain and its condition. As a guide, about 750–800 for wheat, 700–750 for maize, 600–700 for barley and 400–550 for oats. A test weight on your own grain is better.

Volume
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Share sends a link that reopens these numbers. Copy details pastes the full breakdown as a list.

Weight of grain —
US bushels — bu

The formula

flat = length × width × depth ridge = length × width × height ÷ 2 cone = π ÷ 12 × diameter² × height

The ridge is treated as a triangular section running the whole length, ignoring the shorter sloped ends.

What to watch out for

Stay within the load the walls are rated for: a wall that is not built to retain grain can fail. Grain in a pile sits at its natural slope, so a store’s real capacity depends on how it is filled.

Frequently Asked Questions

How many tonnes in a 20 × 10 m store, 3 m deep?

At 770 kg/m³, 462 t in 600 m³.

How big is a US bushel?

35.24 litres, or 1.244 ft³.

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