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Soil, mulch & gravel calculator

Turn bed dimensions into loose material volume, bag quantities and an optional weight estimate.

Make it your own.

Editable example inputs.

Your result.

Clear numbers for your next step.

Ready when you are.

Calculate again after changing inputs.

The working, clearly explained

Behind the numbers.

FIGGYR / FIELD NOTES

How it works

Dimensions describe a uniform loose-material layer. Rectangular area is length × width; circular area is π × radius². Density is never assumed: moisture, material and compaction affect it. Enter your supplier’s loose bulk density if you want a weight estimate. Bag count uses the volume printed on the bag, not its weight. Allowance does not predict compaction or settlement.

The formulaVolume = area × depth × area quantity
Adjusted volume = volume × (1 + allowance / 100)
Bags = round up(adjusted volume / bag volume)
Weight = adjusted volume × entered density

Put it into practice

EXAMPLE

One 3 × 2 m bed at 10 cm depth needs 0.6 m³. With 10% extra, plan 0.66 m³ or 17 bags of 40 L.

Good to know

Is a cubic yard a ton?

No. A cubic yard measures volume; mass depends on density. Ask the supplier for the material-specific density and sold quantity.

Can I combine different beds?

Calculate each bed separately or use the quantity field for identical areas.

One thing leads to another

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