MEASURE ONCE. BUY WITH CONFIDENCE.

Gravel calculator

Plan a path or a decorative patch. Work out your gravel volume and compare buying options.

01

Your spaces

Measurements

After changing units, use this button before editing dimensions. Enter only the dimensions for your selected shape.Convert units

Sample measurements are filled in to get you started. Replace them with yours.

Area 1

Area name

Shape

Length (ft)Width (ft)

Target depth (in)Already there (in)

We calculate only the depth you still need to add.

02

Your buying options

Prices optional

Use prices from your shop or supplier. Leave prices blank for a quantity-only plan.

Extra material (%)An adjustable allowance, not a compaction factor.Currency

Bagged material

Volume per bag (ft³)Price per bag

Bulk delivery

Price per yd³Delivery feeOrder increment (yd³)Ask whether your supplier rounds to ¼, ½, or whole units.

Estimated density (kg/m³)1,600 is an example. Confirm with your supplier.

Working out your order…

No account or saved database record. Shared links include your entered measurements and prices.

TRY THE NUMBERS

Example: gravel for a small rectangular path

A 5 × 1 m path needs a 5 cm gravel layer, with no existing gravel included in this example.
5 × 1 × (5 ÷ 100) = 0.25 cubic metres. A 10% allowance gives 0.275 cubic metres.
That is 11 bags of 25 litres, or 0.3 cubic metres when bulk is sold in 0.1 cubic metre steps. At an assumed density of 1,600 kg/m³, the unrounded order volume weighs about 440 kg.

The weight estimate uses volume including your allowance, before bulk-order rounding. Confirm density with the supplier; 0.3 cubic metres at this example density would weigh about 480 kg.

Open this example in the calculator

Opening the example loads these sample values in place of your current entries.

How to measure

A is the 5 m path length and B is its 1 m width. Measure the intended gravel layer vertically: the side view shows a 5 cm layer, not the depth of a separate base underneath.Illustration only; not drawn to scale.

THE MATH, MADE SIMPLE

How this gravel calculator works

We add the volume of every area, subtract the depth of material already there, then add your chosen allowance. Bags round up to whole bags. Bulk rounds up to the order increment you choose.

Rectangle: length × width × added depth.
Circle: π × (diameter ÷ 2)² × added depth.

For imperial measurements, cubic feet ÷ 27 gives cubic yards. For metric measurements, centimetres ÷ 100 gives depth in metres; one cubic metre equals 1,000 litres.

Before you order

Use your supplier’s bag volume and minimum order increment. Prices use your selected currency without exchange conversion. Both options should use the same tax basis.

Bag costs exclude any bag delivery fee. Add that separately if needed. Choose comparable materials when comparing prices.

Read the bags vs bulk guide ↗

Volume first. Weight is an estimate.

Stone density changes with material, size and moisture. The optional weight estimate uses your entered density, with 1,600 kg/m³ as an illustrative starting value. Ask your supplier for the appropriate density and order quantity. This tool does not design load-bearing bases or drainage systems.