Tonnes of Asphalt per Cubic Meter (Metric Guide)

A cubic meter of compacted asphalt weighs about 2.3 to 2.4 tonnes. Crews in metric countries often round to 2.4 for quick estimates, while the standard US planning density of 145 pounds per cubic foot converts to about 2.32 tonnes per cubic meter. Either is close enough for a first estimate. For an order, ask your plant for the density of the exact mix you're buying.

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How Many Tonnes of Asphalt per Cubic Meter?

Two numbers show up again and again:

• 2.4 tonnes per cubic meter. Red Stag Materials, a UK supplier, says surfacing crews commonly work on this figure (2,400 kg per cubic meter).
• About 2.32 tonnes per cubic meter. BitumenCalc converts 145 pounds per cubic foot to 2,323 kg per cubic meter.

The spread comes from the stone. Heavy aggregates and low air voids push density up, while porous and lightweight mixes pull it down. Asphalt-Calculator.net gives a range of about 2,200 kg per cubic meter for light mixes up to 2,500 for dense-graded ones.

The Metric Formula

Tonnes = area (m²) × thickness (m) × density (t/m³)

Watch the thickness. Specs are usually in millimeters, so divide by 1,000 to get meters. An 80 mm layer is 0.08 m.

Red Stag Materials works through a road patch 10 m long and 2 m wide, laid 80 mm deep. Here's that same job:

• Area: 10 × 2 = 20 square meters
• Volume: 20 × 0.08 = 1.6 cubic meters
• Weight: 1.6 × 2.4 = 3.84 tonnes

At 2.32 instead, you'd get about 3.71 tonnes. The difference is small on a patio-sized job and bigger on a road.

Coverage Table by Thickness

This table uses 2.4 tonnes per cubic meter. "Coverage" is how many square meters one tonne will pave at that compacted thickness, a figure Red Stag says some in the trade call "covers" or "superage."

Thickness	Tonnes per m²	m² per tonne
40 mm	0.096	About 10.4
50 mm	0.12	About 8.3
60 mm	0.144	About 6.9
80 mm	0.192	About 5.2
100 mm	0.24	About 4.2

A quick rule from the same math: at 2.4, every 10 mm of thickness weighs 24 kg per square meter. Multiply 24 by the number of 10 mm steps, then by your area.

Tonnes vs. Tons: Don't Mix Them Up

These are three different units:

• Metric tonne: 1,000 kg, or about 2,204.6 pounds
• US short ton: 2,000 pounds
• UK long ton: 2,240 pounds (rarely used for asphalt now)

A metric tonne is about 10 percent heavier than a US ton. BitumenCalc notes that ten metric tonnes equal about 11.02 US tons. If you're reading a European spec but buying from a US plant, convert before you order, or you'll come up short.

Converting Between Metric and US Figures

A few conversions help when a job mixes units:

• 1 cubic meter = about 1.308 cubic yards
• 1 cubic yard of compacted hot mix at 145 lb/ft³ = about 1.78 metric tonnes
• 1 square meter = about 10.76 square feet
• 25 mm is about 1 inch; 50 mm is about 2 inches

In US terms, the 145-pound density translates into roughly 109 pounds for each square yard per inch. The metric version of that shortcut is 24 kg per square meter per 10 mm at 2.4 density, or about 23.2 kg at 2.32.

If you'd rather work in feet and inches, the blacktop calculator guide handles imperial units.

The imperial version of this conversion, with a table by mix type, is in asphalt weight per cubic yard.

Why Density Varies

Asphalt is mostly stone, around 95 percent by weight, held together by a small amount of binder. The stone decides most of the weight. Granite, limestone, basalt, and slag all have different densities, and each plant uses what's local. That's why a mix in one region can weigh noticeably more per cubic meter than a mix a few hundred kilometers away. There's more on the ingredients in the look at what goes into asphalt.

Compaction matters too. The numbers above are for rolled, finished pavement. Loose mix in a truck takes up more space, so a cubic meter of it weighs less. Always estimate from finished dimensions.

Adding Waste

Order a little extra, usually 5 to 10 percent, for edges, handwork, and uneven base. For a 3.84-tonne job, that means ordering about 4 to 4.2 tonnes. Round up, and ask the plant about its minimum load and how it rounds small orders. On a larger job, ask whether the plant will credit unused mix or whether the extra is yours to deal with, since leftover hot mix can't sit around and wait.

US estimators often use a per-square-yard shortcut instead; see the 110-pound rule.

Price Notes

For rough US planning, $90 to $130 per short ton plus delivery is the range we work with; your plant's price depends on location and time of year, so get a quote and check it with our cost per ton calculator. Metric-market pricing is in local currency per tonne and varies widely. Whatever the market, ask for a written quote that states the unit, because "ten tons" can mean different weights in different places.

Bottom Line on Tonnes per Cubic Meter

For how many tonnes of asphalt per cubic meter, use about 2.4 as a working figure, or 2.32 if you want to match the US standard density. Multiply area by thickness in meters by that density, add 5 to 10 percent, and confirm the mix density and the weight unit with your supplier.