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Gravel Calculator

Loose volume and estimated weight using a supplier density.

Your project

Enter your measurements. Required fields are labeled; assumptions and optional quotes can be edited below.

Loading measurement inputs…

Calculator inputs
Length Required
Enter whole feet and inches less than 12. One blank component means 0.
Width Required
Enter whole feet and inches less than 12. One blank component means 0.
Layer depth Required
Use a decimal point. Complete or clear an unfinished measurement before changing its units.

Enter the actual intended gravel layer depth. The reserve adds volume; it is not a compaction model.

Allowance
0–50%. Optional extra material volume. No automatic settling or compaction factor is applied.
Material options
Editable supplier bulk density in lb/ft³. Range: 6.24–187.28 lb/ft³. The illustrative default is 100 lb/ft³, equivalent to 1601.8463374 kg/m³.
Optional cost
Optional quote in USD per yd³. Zero is valid. Two decimals for direct prices; converted rates allow up to six decimals. Excludes tax, delivery and labor.

How this calculator works

Enter a rectangle or a measured area and the actual intended layer depth. The geometric base volume is area × depth. An explicit reserve adds volume before the density estimate or quote is applied. Bulk quantities stay continuous: no bag count, supplier minimum or delivery increment is inferred.

Volume formulaBase = area × depth; required = base × (1 + allowance / 100); estimated mass = required × density.

Assumptions and limitations

The illustrative loose density is 100 lb/ft³, represented as 1601.8463374 kg/m³ in Metric. It is editable, not a promise for every gravel product. Material, grading, moisture and compaction change loose density. Confirm your supplier’s bulk density and quote basis. US short tons (2000 lb) and metric tonnes (1000 kg) are distinct. Volume and mass quotes are retained separately and use unrounded quantities. Costs exclude tax, delivery and labor.

Worked examples

20 × 10 ft at 3 in depth, 0% reserve and 100 lb/ft³ needs 50 ft³, or 1.8518518519 yd³. Estimated weight is 5000 lb, or 2.5 US short tons. At $60/yd³, the quote estimate is $111.11.

30 m² at 5 cm depth and 10% reserve has a 1.5 m³ base and needs 1.65 m³. At a custom density of 1600 kg/m³, estimated weight is 2640 kg, or 2.64 metric tonnes. At $40/metric tonne, cost is $105.60.

These are reference examples. Your estimate uses only the measurements and assumptions you enter above.

Read the calculation methodology