Gravel Calculator

Estimate gravel volume for a driveway, path or landscaping area. Enter your planned depth, add an optional allowance and use your supplier’s bulk density to estimate weight and material cost.

Calculate Your Gravel Quantity

Start with area and depth. Density is only needed for weight or weight-based pricing.

Enter the thickness of the layer you are estimating. No automatic compaction adjustment is applied.

Increases the calculated quantity by your chosen percentage. Leave blank for no allowance.

Weight estimate — optional

Use bulk density for the gravel product and material condition being estimated. Crushed stone and pea gravel do not automatically share the same density.

Material cost — optional

Weight-based pricing requires a bulk density. Delivery, tax, installation and supplier minimums are excluded. Currency selection does not convert prices.

Working with several sections? The Square Footage Calculator can help you find their areas. Combine areas when the gravel depth is the same; calculate different depths separately.

FROM AREA AND DEPTH TO QUANTITY

How to Use the Gravel Calculator

Measure the area and planned layer depth to estimate volume. Add a supplier-provided bulk density when you need weight or weight-based material cost.

  1. Choose the area shape

    Enter length and width for a rectangular area, or diameter for a circle. For an irregular layout, calculate its coverage area first and use the known-area option. Exclude sections that will not receive gravel.

  2. Enter your layer depth

    Set the thickness of the gravel layer you are estimating. Add an optional allowance if your purchasing plan requires extra material. The calculator does not automatically convert compacted depth into loose delivery volume.

  3. Add bulk density for a weight estimate

    Enter your supplier’s bulk density and select its unit. Then choose kilograms, pounds or a specific ton type for the weight result. Leave density blank if you only need volume.

  4. Check quantities and optional cost

    Review cubic yards, cubic feet and cubic meters. Select your supplier’s price basis and enter its unit price for a material cost estimate. Weight-based pricing requires a valid bulk density.

Keep material conditions consistent: An allowance is a percentage increase, not an automatic compaction calculation. If you need a compacted layer, ask your supplier or installer how its required loose quantity should be estimated.

COMPARE VOLUME, WEIGHT AND COST

Gravel Calculation Examples

Follow two purchasing scenarios: gravel priced by cubic yard and gravel priced by metric tonne. Depths, density, allowances and prices below are illustrative.

VOLUME-BASED PRICING

A rectangular path with an extra allowance

Estimate a 30 × 4 ft path with a 3-inch gravel layer. Include a 10% purchasing allowance and a price per cubic yard.

Path dimensions
30 × 4 ft
Layer depth
3 inches
Extra allowance
10%
Example price
$60.00 USD / cu yd
Bulk density
Not needed
  1. Find the area and convert depth

    30 × 4 = 120 sq ft
    3 ÷ 12 = 0.25 ft

  2. Calculate the geometric volume

    120 × 0.25 = 30 cu ft

  3. Add the allowance and convert to cubic yards

    30 × 1.10 = 33 cu ft
    33 ÷ 27 ≈ 1.22 cu yd

  4. Apply the price to the unrounded volume

    (33 ÷ 27) × $60.00 ≈ $73.33 USD

ESTIMATED VOLUME AND MATERIAL COST 1.22 cu yd · $73.33 USD

The displayed volume is rounded. Cost uses the unrounded quantity and excludes delivery, tax, installation and supplier minimums.

WEIGHT-BASED PRICING

Convert a metric volume to tonnes

Estimate an 8 × 3 m area with a 5 cm layer. Use an illustrative bulk density of 1,600 kg/m³ and a price per metric tonne.

Area dimensions
8 × 3 m
Layer depth
5 cm
Extra allowance
0%
Example bulk density
1,600 kg/m³
Example price
$45.00 USD / metric tonne
  1. Calculate area and convert depth

    8 × 3 = 24 m²
    5 ÷ 100 = 0.05 m

  2. Calculate the volume

    24 × 0.05 = 1.20 m³

  3. Multiply by bulk density

    1.20 × 1,600 = 1,920 kg
    1,920 ÷ 1,000 = 1.92 metric tonnes

  4. Calculate material cost

    1.92 × $45.00 = $86.40 USD

ESTIMATED WEIGHT AND MATERIAL COST 1.92 metric tonnes · $86.40 USD

This weight depends on the example density. Replace it with the bulk density supplied for your chosen gravel and its material condition.

Working with a circular gravel area?

The Circle Area Calculator can help you check the footprint from its radius or diameter. For a ring around a planting bed, subtract the inner circle’s area from the outer circle’s area, then enter the remaining coverage using the gravel calculator’s known-area option.

Match the estimate to your order: These examples calculate uniform layers without an automatic compaction adjustment. Confirm the required loose quantity, density and delivery increments with your supplier or installer.

CHECK COVERAGE AND UNITS

Gravel Coverage & Calculation Formulas

Check how layer depth affects coverage and understand how bulk density connects gravel volume to weight.

Calculate gravel volume

Cubic yards = area in sq ft × depth in inches ÷ 324

For cubic feet, divide area × depth in inches by 12. For cubic meters, multiply area in square meters by depth in meters.

Estimate gravel weight

Weight in kg = volume in m³ × bulk density in kg/m³

Use the adjusted volume if you included an allowance. Divide kilograms by 1,000 for metric tonnes, or select the matching weight unit in the calculator.

Theoretical coverage of one cubic yard spread uniformly. No allowance or compaction adjustment is included. Depths illustrate the calculation, not construction specifications.
Layer depth Coverage per cubic yard Volume for 100 sq ft
1 inch 324 sq ft 0.31 cu yd
2 inches 162 sq ft 0.62 cu yd
3 inches 108 sq ft 0.93 cu yd
4 inches 81 sq ft 1.23 cu yd
6 inches 54 sq ft 1.85 cu yd

A cubic yard does not have one fixed gravel weight

Cubic yards measure volume; tons measure mass. Converting between them requires bulk density. Use a value for the chosen product and its condition rather than treating one conversion as universal.

Crushed stone and pea gravel use the same volume formula

Area × depth gives geometric volume for either material. Weight estimates still need the appropriate bulk density. Changing the product name alone does not establish its density, compaction behavior or suitability.

Calculate different layers separately

If a project has a base layer and a separate finish layer, calculate each one using its own depth. Use each material’s density and price when estimating weight and cost. Do not apply one layer’s depth to the whole project.

Allowances and compaction are separate decisions

An allowance multiplies the entered geometric volume by your selected percentage. It does not determine how much loose material will produce a specified compacted layer. Confirm that relationship for your material and project.

Match the ton type to your supplier’s quote

A US short ton is 2,000 lb, a metric tonne is 1,000 kg, and an imperial long ton is 2,240 lb. Choose the correct type for both the weight result and price basis. The NIST unit conversion tables list these distinct mass units and their conversion factors.

HELP WITH YOUR GRAVEL ESTIMATE

Frequently Asked Questions

Find answers about gravel quantities, bulk density, weight units and the limits of a volume estimate.

How do I calculate how much gravel I need?

Multiply the area receiving gravel by the planned layer depth using compatible units. For square feet and inches, calculate area × depth ÷ 324 to get cubic yards.

The gravel calculator converts the measurements, applies any extra allowance you choose and displays the volume in cubic yards, cubic feet and cubic meters.

How much area does one cubic yard of gravel cover?

Coverage depends on layer depth. One cubic yard covers 162 sq ft at 2 inches, 108 sq ft at 3 inches, or 81 sq ft at 4 inches.

These are geometric coverage values for uniform layers without an extra allowance or compaction adjustment. The depths are examples, not specifications for a driveway or other construction project.

How many tons are in a cubic yard of gravel?

There is no single conversion for every gravel product. A cubic yard measures volume, while tons measure mass. You need the product’s bulk density to connect them.

Enter the density supplied for your chosen material, then select US short tons, metric tonnes or imperial long tons. Make sure the selected ton type matches your supplier’s quote.

What bulk density should I enter?

Use a supplier-provided bulk density for the product and material condition you are estimating. Bulk density relates the material’s mass to its occupied volume, including spaces between particles.

Do not substitute the density of solid rock or assume all gravel products have the same value. If you do not have a suitable bulk density, leave the field blank and use the volume estimate.

Can I use this for pea gravel and crushed stone?

Yes, the area × depth calculation can estimate geometric volume for either material. For a weight estimate, enter the appropriate bulk density for the actual product.

The calculator does not select a stone size, grading or material specification. Confirm suitability and installation requirements for your intended use.

Does the calculator account for compaction?

No automatic compaction factor is applied. The calculator uses the area and depth you enter, then increases that volume by your optional allowance.

If you need a finished compacted layer, ask your supplier or installer how much loose material is required. An allowance percentage alone does not establish a reliable loose-to-compacted conversion.

How do I estimate several areas or different gravel layers?

For areas using the same material at the same depth, combine their coverage areas and use the known-area option. Avoid counting overlapping areas twice.

Calculate different depths or materials separately. Use the matching density and price for each layer. You can then add the individual costs for your overall material estimate.

What is included in the gravel cost estimate?

The result estimates material cost from your entered unit price and the unrounded quantity, including any extra allowance. Volume-based pricing uses volume; weight-based pricing uses the density-derived weight.

Delivery, tax, installation, minimum orders and supplier rounding are excluded. Currency selection labels the price you enter and does not apply an exchange rate.

PLAN YOUR GRAVEL ORDER

Turn Your Measurements into a Gravel Estimate

Find the volume for your planned gravel layer. Add your supplier’s bulk density and unit price to estimate weight and material cost.

Calculate Gravel Quantity