Ton to CFT Stone Calculator
Convert stone, sand, and stone dust between tonnes and cubic feet (CFT) both ways — the ordering units used across India and South Asia.
Quick Answer
One tonne of stone dust is roughly 21.3 CFT, and 100 CFT — one brass — comes to about 4.7 tonnes. The exact figure moves with the material: sand packs tighter at about 18.6 CFT per tonne, while pea gravel runs looser at about 22 CFT per tonne.
Ton to CFT Stone Calculator (1 Ton = How Many CFT?) Guide
Across India and much of South Asia, aggregate is ordered by volume in CFT (cubic feet) but delivered and billed by weight in tonnes. That mismatch is where money goes missing. This ton to CFT stone calculator converts between the two in either direction, using the bulk density of the specific material you are buying rather than one blanket number.
The conversion itself is simple — weight = volume × bulk density — but the density is what people get wrong. Stone dust, sand, and pea gravel do not weigh the same per cubic foot, so a single rule of thumb applied to every material will under-order one job and over-order the next.
How many CFT in 1 ton?
The table below is the direct answer for the materials people ask about most. Every figure uses the same bulk densities applied across this site, converted with tonne/ft³ = (short tons per cubic yard) × 0.90718 ÷ 27.
CFT per tonne, and tonnes per 100 CFT, by material
| Material | CFT in 1 tonne | Tonnes in 100 CFT | Bulk density (kg/m³) |
|---|---|---|---|
| Stone dust / crusher dust | 21.3 CFT | 4.70 t | 1,661 |
| Gravel | 21.3 CFT | 4.70 t | 1,661 |
| Crushed stone | 19.8 CFT | 5.04 t | 1,780 |
| #57 stone | 20.5 CFT | 4.87 t | 1,721 |
| Sand | 18.6 CFT | 5.38 t | 1,898 |
| Pea gravel | 22.0 CFT | 4.54 t | 1,602 |
| Crushed concrete | 22.0 CFT | 4.54 t | 1,602 |
| Topsoil | 27.1 CFT | 3.70 t | 1,305 |
What one brass means in tonnes
In the Indian building trade a brass is a fixed volume — 100 cubic feet — not a weight. It is the reason so many people search for "100 CFT stone = how many ton": they are really asking what a brass of material will weigh on the delivery challan. For stone dust that is about 4.7 tonnes, and for sand closer to 5.4 tonnes.
Because a brass is volume and the bill is weight, the same one brass order can arrive at noticeably different tonnages depending on how wet the material is when it is loaded. Damp sand can carry several percent of its weight in water, which is why a load that looks identical to last month's can weigh more.
Metric tonne or US short ton?
This matters more than it sounds. A metric tonne is 1,000 kg; a US short ton is 907 kg — about 10% lighter. This calculator works in metric tonnes, which is what "ton" means on an Indian supplier's invoice. If you are working to American figures instead, use the cubic yards to tons calculator, and for cubic metres use the aggregate cubic meter calculator. Mixing the two units is one of the most common reasons a conversion comes out roughly a tenth off.
Why your supplier's number differs from the chart
Bulk density is not a fixed property of a material — it is a property of a material in a particular state. Three things move it: moisture, gradation, and compaction. Freshly crushed dust that has been sitting uncovered through rain weighs more per CFT than the same dust stored dry. Well-graded material with fines filling the voids between larger particles packs denser than a single-size aggregate. And material compacted in the truck settles tighter than loose-tipped material.
A 5-10% spread between the chart and a real delivery is normal and not a sign anyone is short-changing you. If you need the figure your own supplier works to, ask what density they bill against — most will tell you. For the reasoning behind these numbers, see our note on stone dust density.
Working from site dimensions instead
If you know the area and depth of the work rather than the volume, calculate the CFT first and then convert. The stone cubic feet calculator turns length, width, and depth into cubic feet. For a stone dust bedding layer specifically, the stone dust calculator goes straight from dimensions to quantity, and the sand calculator does the same for sand.
One habit worth keeping: order against the compacted depth you actually want, not the loose depth you measure when tipping. Stone dust in particular loses noticeable height once it is watered and tamped, and the stone compaction calculator accounts for that before you place the order rather than after.
Sources & Methodology
Volume-to-weight results use standard aggregate bulk densities (for example, crushed stone ≈ 1.5 US tons per cubic yard) applied consistently across this site, and pricing reflects 2026 U.S. supplier averages that vary by region and delivery. All results are planning estimates — confirm the exact density and price with your local supplier before ordering.
Frequently Asked Questions
How many CFT is 1 ton of stone dust?
About 21.3 CFT. That comes from a bulk density near 1,661 kg/m³ for loose stone dust. Expect a real delivery to land within roughly 5-10% of that, since damp dust weighs more per cubic foot than dry dust and will therefore give you fewer CFT to the tonne.
100 CFT stone is how many tons?
For stone dust or gravel, 100 CFT works out to roughly 4.7 tonnes. Crushed stone is heavier at about 5.04 tonnes, and sand heavier still at about 5.38 tonnes. 100 CFT is also exactly one brass, which is why this question comes up so often when reading a delivery challan.
What is 1 brass of stone in tonnes?
One brass is 100 cubic feet of volume, not a weight, so its tonnage depends entirely on the material. Stone dust comes to about 4.7 tonnes per brass, sand about 5.38 tonnes, and crushed stone about 5.04 tonnes. Suppliers quoting per brass are selling you volume, so confirm which material and what moisture state the quote assumes.
Does 'ton' here mean a metric tonne or a US short ton?
This calculator uses the metric tonne of 1,000 kg, which is what appears on Indian and most non-US supplier invoices. A US short ton is 907 kg, roughly 10% lighter, so applying an American figure to an Indian order will leave you about a tenth short. If you need short tons, use the cubic yards to tons calculator instead.
Why does my supplier quote a different CFT per ton?
Because bulk density changes with moisture, gradation, and how tightly the material was loaded. A supplier billing against damp, well-graded, compacted material will quote fewer CFT to the tonne than a chart based on loose dry material. A 5-10% difference is normal. Ask what density they bill against if you want to reconcile the numbers exactly.
How do I convert CFT to cubic metres?
Multiply CFT by 0.0283168. So 100 CFT is 2.83 m³, and 1,000 CFT is 28.32 m³. Going the other way, multiply cubic metres by 35.315. The converter above shows the cubic metre and cubic yard equivalents alongside every result, so you do not need to do this by hand.
Sources & Methodology
This calculator uses standard published conversion factors and material densities. Density figures are typical values — actual material varies by quarry, moisture content and compaction, so treat results as estimates and confirm quantities with your supplier before ordering.
- Special Publication 811: Guide for the Use of the International System of Units — NIST
Defines the exact conversion factors between pounds, kilograms and other units used by this calculator.
- Publications and Documentary Standards (Handbook 44) — NIST Office of Weights and Measures
The specifications and tolerances for commercial weighing devices adopted by all 50 states.
- Weights, measures and packaging: the law — GOV.UK
UK rules on units of measurement, including the stone as a unit of body weight.
Reviewed by the Stone Calculator editorial team
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