Calc4Living

Gardening & Landscaping · Free calculator

Gravel Calculator

Estimate gravel volume and mass using rectangular dimensions, layer depth and an editable bulk-density assumption.

Your measurements

Prefilled values are editable examples. Measure your own space and check the selected units. Allowance and bed count may be left blank; all other fields are required.

Enter your measured dimension in the selected unit. Zero gives zero area or volume.

Enter your measured dimension in the selected unit. Zero gives zero area or volume.

Uniform material depth, not a dimension in square or cubic units.

Editable example: 1,600 kg/m³. Ask your supplier for bulk density in the appropriate loose or compacted state.

Changing units converts the current measurements; changing any input clears the previous result.

Your estimate

Material quantities

Review the example measurements, select your units and calculate. No quantities have been calculated yet.

How much gravel do I need for a rectangular area?

Volume = length × width × depth in consistent units. Mass (kg) = volume (m³) × bulk density (kg/m³). Metric tonnes = kg ÷ 1,000; pounds = kg ÷ 0.45359237.

Worked example

A 10 m × 5 m surface covered 5 cm deep needs 2.5 m³ (about 3.2699 yd³). At an illustrative bulk density of 1,600 kg/m³, its estimated mass is 4,000 kg = 4 metric tonnes (about 8,818.4905 lb).

Unit conversions

1 ft = 0.3048 m; 1 in = 0.0254 m; 1 cm = 0.01 m. 1 yd³ = 27 ft³ = 0.764554857984 m³; 1 liter = 0.001 m³. 1 acre = 4,046.8564224 m². 1 lb = 0.45359237 kg.

Assumptions & limitations

  • The default 1,600 kg/m³ is an editable example, not a verified density for your material. Use supplier bulk density, which includes void space, rather than solid-rock density.
  • Density varies with aggregate type, size, moisture and compaction. Estimate mass using a density appropriate to the same loose or compacted state as the entered layer volume.
  • No compaction, over-excavation or waste allowance is automatically added. Metric tonnes are 1,000 kg and are not US short tons or UK long tons.