Gravel Calculator

Calculate how much gravel you need in cubic yards, estimated tons, or whole bags without hiding the material density behind the answer.

Gravel quantity and orderVolume is geometric; tons and mass-based bags use your editable density.

88gravel bags

Net volume: 40 ft³ (1.48 yd³)
Order volume: 44 ft³ (1.63 yd³)
Estimated order weight: 3,960 lb
US short tons: 1.98
Whole bags: 88 × 45 lb

Weight depends on the editable bulk density. Use a supplier value for the same gravel and material condition.

Show calculation

12 ft × 10 ft × 4 in ÷ 12 × (1 + 10%) × 90 lb/ft³ = 3,960 lb

Transparent method and editable product assumptions. Verify current labels and project requirements.

How this calculator works

This gravel quantity calculator multiplies project length, width, and average installed depth to find net cubic feet. It also converts that volume to cubic yards, the unit commonly used for a bulk gravel order in the United States.

The extra-material percentage is applied once to net volume. Estimated weight then uses the loose bulk density you enter. Gravel tonnage is shown in 2,000 lb US short tons; it is not a metric tonne and it is not inferred from stone size alone.

The default 90 lb/ft³ density is only a transparent reference derived from one retail product listing 45 lb for 0.5 ft³. Crushed gravel, washed gravel, moisture, compaction, grading, and void space can change bulk density. Set density to zero for a volume-only result or replace it with the selected supplier’s value.

Formula

Volume = length × width × depth; order weight = volume × (1 + extra) × bulk density; bags = ceil(weight ÷ bag weight)

The live substitution appears with your result.

Control example: 12 × 10 ft area at 4 in deep

The net volume is 12 × 10 × 4 ÷ 12 = 40 ft³. Ten percent extra raises the order volume to 44 ft³.

At the editable 90 lb/ft³ reference density, the estimate is 3,960 lb, 1.98 US tons, or 88 whole 45 lb bags.

Assumptions and limits

The project area is rectangular and does not overlap another measured area.
Depth is an average installed depth across the full area.
Bulk density matches the selected gravel and its loose or compacted condition.
A ton means a 2,000 lb US short ton; delivery increments are set by the supplier.

Common measuring mistakes

Using compacted density for a loose truck order without checking the supplier.
Entering inches of depth as feet.
Adding waste to dimensions and then applying the percentage again.
Treating pea gravel, decorative rock, and compacted paver base as interchangeable materials.

Sources

Product-specific values remain editable. These sources support the method and stated examples; they are not a universal substitute for your supplier’s current label.

QUIKRETE All-Purpose Gravel Confirms a 50 lb bagged gravel product and illustrates why bag size must match the selected product.
Lowe’s 0.5 ft³ gray gravel product data Lists 0.5 ft³ and 45 lb for one product; the derived 90 lb/ft³ value is an editable example, not a universal density.

Questions people ask

How do I calculate how much gravel I need?

Multiply length by width by average depth in feet. Divide cubic feet by 27 for cubic yards, then add one explicit order allowance.

How many tons are in a cubic yard of gravel?

There is no single conversion. Multiply 27 ft³ by the bulk density for the same gravel and material condition, then divide pounds by 2,000.

What depth should I enter?

Enter the installed depth required by your own project or product plan. This calculator estimates quantity and does not design the section.

Can I calculate gravel without knowing density?

Yes. Set density to zero and use the cubic-yard result. Weight and mass-based bag estimates require a supplier density.

Is this the same as a pea gravel calculator?

The geometry is related, but generic gravel can have different grading, density, compaction, and use. Use the material-specific page when its assumptions better match the job.