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Tonnage Calculator

Construction

Estimate tons of gravel, sand, topsoil, mulch, or crushed stone needed to cover an area to a given depth. Enter length, width, depth, and material type.

1500
1500
0.524

Tons Needed

3.46
Cubic Yards
2.47

This calculator computes your Tons Needed, Cubic Yards from the values you enter.

Inputs
LengthWidthDepthMaterial Type
Outputs
Tons NeededCubic Yards

What is a Tonnage?

A Tonnage Calculator estimates how many tons of bulk landscaping or construction material — gravel, sand, topsoil, mulch, crushed stone, or rip rap — you need to cover an area to a specific depth. Bulk materials are almost always sold and delivered by weight, but most people plan projects in terms of area and depth, creating a conversion gap that leads to over- or under-ordering. This calculator bridges that gap by converting your area and depth into cubic yards, then applying the correct density for your chosen material to output tons.

This is especially useful for anyone planning a driveway base, garden bed topsoil fill, drainage rip rap, or mulch bed, where suppliers quote and charge by the ton. If you're working purely in volume terms without needing a weight conversion, the Cubic Yard Calculator covers that step on its own, while the Sand Calculator handles sand-specific volume and weight estimates.

Because different materials pack very differently — mulch is light and airy while gravel is dense and heavy — using the correct density for your specific material is essential to avoid a delivery that's far too much or far too little.

How to use this Tonnage calculator

  1. Enter the Length of the area in feet.
  2. Enter the Width of the area in feet.
  3. Set the Depth in inches — how thick a layer of material you plan to spread.
  4. Select the Material Type from the dropdown — Gravel, Sand, Topsoil, Mulch, Crushed Stone, or Rip Rap.
  5. Review the Tons Needed result to place your order, and check Cubic Yards to cross-verify against a supplier's volume quote.

Formula & Methodology

The calculator converts area and depth into cubic yards, then applies material density:

Cubic Yards = (Length × Width × (Depth ÷ 12)) ÷ 27

Tons Needed = Cubic Yards × Density (tons/yd³)

Density values used: Gravel = 1.4 tons/yd³, Sand = 1.35 tons/yd³, Topsoil = 1.0 tons/yd³, Mulch = 0.4 tons/yd³, Crushed Stone = 1.35 tons/yd³, Rip Rap = 1.5 tons/yd³.

Worked example: A 20 ft × 10 ft driveway base at 4 inches deep, using gravel:

Cubic Yards = (20 × 10 × (4 ÷ 12)) ÷ 27 = 2.47 yd³

Tons Needed = 2.47 × 1.4 = 3.46 tons

Frequently Asked Questions

Multiply the length and width of the area in feet by the depth in feet (inches divided by 12), then divide by 27 to convert cubic feet to cubic yards. Multiply that cubic yard figure by the material's density in tons per cubic yard — gravel is typically around 1.4 tons/yd³.
Cubic Yards = (Length × Width × Depth in feet) ÷ 27, and Tons Needed = Cubic Yards × Density (tons/yd³). Each material has a different density, so the same volume of mulch weighs far less than the same volume of gravel.
Mulch is organic wood material with a lot of air space between pieces, giving it a density of around 0.4 tons/yd³, while gravel is dense mineral rock at about 1.4 tons/yd³ — roughly 3.5 times heavier for the same volume. This is why a mulch delivery truck can carry a much larger volume than a gravel truck of the same weight capacity.
Gravel and crushed stone have similar densities (around 1.35–1.4 tons/yd³), but crushed stone is angular and interlocks more tightly, while gravel is rounded and settles more loosely. For tonnage estimating purposes, they can generally be treated the same, though crushed stone may compact slightly more over time.
Using the formula: Cubic Yards = (20 × 10 × (4÷12)) ÷ 27 = 2.47 yd³, and at topsoil's density of 1.0 tons/yd³, that's about 2.47 tons. Use the calculator above to adjust for your exact dimensions and material.
Enter the length and width of the area in feet, set the depth in inches, and select the material type from the dropdown. The calculator instantly shows the tons needed and the equivalent cubic yards.
The calculator includes preset densities for gravel, sand, topsoil, mulch, crushed stone, and rip rap, which cover most common landscaping and construction materials. If your material isn't listed, look up its density in tons per cubic yard from your supplier and multiply manually by the cubic yard figure the calculator provides.
Most bulk material suppliers price and deliver by the ton, not by volume, so knowing tonnage in advance prevents over-ordering (wasted money) or under-ordering (a second delivery trip). It also helps confirm that a delivery truck's weight capacity matches your order.
Yes — loose material settles and compacts once spread and walked on or driven over, typically losing 10–20% of its volume. For applications like driveways or base layers, consider ordering 10% extra material to account for this compaction.
A typical gravel driveway base is 4 to 6 inches deep for the base layer, with an additional 2-inch top layer of finer gravel or crushed stone. Enter your planned depth for each layer separately in the calculator to get an accurate total tonnage.
The densities used are industry-standard averages for each material type, accurate within about 5–10% for most suppliers. Actual density can vary based on moisture content and particle size, so for large or critical orders, confirm exact density with your specific supplier.
Also known as
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