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Gravel, Soil and Mulch Estimator

Use this gravel, soil and mulch estimator entirely in your browser.

ResultGravel volume: 1.760 m³

Measured volume: 1.600 m³

Equivalent volume: 2.302 yd³

Approximate 50-litre bags: 36

Compaction, settlement, moisture, grading, delivery units, and bulk density are not included.

Calculations happen locally in your browser.

How to use this calculator

  1. Enter the labelled values and review the live result.
  2. Review the live result and use Copy result when you need to share it.

How the calculation works

Area is multiplied by layer depth converted to metres, then the entered allowance is added and volume is converted to bags.

Formula

Volume = length × width × (depth ÷ 1,000) × (1 + allowance ÷ 100)

Step-by-step calculation

  1. Enter the labelled values and review the live result.
  2. Area is multiplied by layer depth converted to metres, then the entered allowance is added and volume is converted to bags.
  3. Check the displayed result, then copy it if needed.

Worked example

An 8 m by 4 m area at 50 mm depth with 10% allowance requires 1.760 m³.

Risk guidance

Volume rather than weight

The estimate reports cubic metres, cubic yards, litres, and bags. It deliberately avoids converting to tonnes because bulk density changes by material, grading, moisture, and compaction.

Check settled depth and delivery units

Loose material may settle or compact after placement. Confirm the intended finished depth, supplier delivery unit, minimum order, and bag size.

Frequently asked questions

Does this tool send my inputs anywhere?

No. The interactive calculation runs in your browser and this site does not submit tool inputs to a backend.

How should I use the result?

Use it for early planning only. Verify measurements, definitions, current local requirements, and the complete design with the relevant authority and appropriately qualified professionals.

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