CFT Calculator: Cubic Feet, Cubic Metres and Brass
CFT = length × breadth × height, all in feet. 1 m³ = 35.3147 cft and 1 brass = 100 cft.
A 12 ft 6 in × 10 ft slab, 6 in thick, is 12.5 × 10 × 0.5 = 62.5 cft: 0.625 brass, about 1.77 m³. Enter dimensions or convert a volume below.
Calculate cubic feet or convert volume
Changing units clears dimensions for re-entry. For 6 inches, enter 0 feet and 6 inches. Use internal dimensions for a container.
- Cubic feet
- 62.5 cft
- Cubic metres
- 1.769801 m³
- Brass
- 0.625 brass
- Litres
- 1,769.8012 L
Measured volume only; no dry-volume, bulking or wastage allowance. Uses 1 m³ = 35.3147 cft (rounded) and 1 m³ = 1,000 L.
Brass ↔ cft converter
1 brass = 100 cft.
- Brass = cft ÷ 100
- 2.5 brass
Cubic feet, cubic metres, brass and litres
1 m³ = 35.3147 cft, 1 brass = 100 cft and 1 cft = 28.3168 litres; the metric factors are rounded.
| Conversion | Formula | Example |
|---|---|---|
| m³ to cft | m³ × 35.3147 | 2 m³ ≈ 70.6294 cft |
| cft to m³ | cft ÷ 35.3147 | 100 cft ≈ 2.8317 m³ |
| cft to brass | cft ÷ 100 | 250 cft = 2.5 brass |
| brass to cft | brass × 100 | 3 brass = 300 cft |
| cft to litres | cft × 28.3168 | 100 cft ≈ 2,831.68 L |
| litres to cft | litres ÷ 28.3168 | 28.3168 L ≈ 1 cft |
Brass is a volume (100 cft, about 2.83 m³), not a weight. Turning tonnes into cft needs the material's bulk density and moisture; the sand calculator does this for sand.
Worked examples for a slab, excavation and timber
Convert every dimension to feet before multiplying: a 6 in slab is 0.5 ft thick, not 6.
Slab: 12 ft 6 in × 10 ft × 6 in
Length = 12 + 6 ÷ 12 = 12.5 ft. Thickness = 6 ÷ 12 = 0.5 ft. Volume = 12.5 × 10 × 0.5 = 62.5 cft = 0.625 brass ≈ 1.77 m³. This is the finished concrete volume, before any ordering allowance.
For a metric slab, 6 × 4.5 × 0.15 m = 4.05 m³ ≈ 143.02 cft. Entering 6,000 × 4,500 × 150 mm gives the same answer, since 1 m³ = 1,000,000,000 mm³.
Rectangular excavation: 20 × 5 × 3 ft
Measured excavation = 20 × 5 × 3 = 300 cft = 3 brass ≈ 8.50 m³. That assumes vertical sides and a constant depth; measure sloped or stepped cuts separately. Dug soil loosens, so the volume to cart away is usually more than this in-place figure.
Sawn timber: 10 ft × 6 in × 3 in
Solid rectangular volume = 10 × (6 ÷ 12) × (3 ÷ 12) = 1.25 cft. The shortcut is length in feet × breadth in inches × thickness in inches ÷ 144. Eight such pieces make 10 cft. Tally different sections separately; round logs use a different trade measure.
Use the volume for the right construction quantity
Cft gives the measured volume; cement, sand and aggregate need the mix, so take the volume to the matching calculator.
- Concrete: use the concrete calculator for cement, sand and aggregate from the finished slab, beam or footing volume.
- Sand: use the sand calculator for sand in concrete, plaster or brickwork, including dry weight in tonnes.
- Excavation: record each pit or trench section and depth. Keep in-place excavation separate from loose transport volume and compacted backfill.
- Timber: tally actual length, breadth and thickness for each rectangular section, then multiply by its piece count.
Square feet measure a surface; cubic feet measure a volume. If you only have a floor area, first use the square feet calculator, then multiply by thickness in feet.
Conversion sources and precision
The tool uses 35.3147 cft per m³ and 28.3168 litres per cft, both rounded from the exact foot of 0.3048 m.
NIST SP 811 fixes the foot at exactly 0.3048 m, so 1 cft = 0.3048³ = 0.028316846592 m³, or 28.316846592 litres (1 litre = 0.001 m³). The tool converts litres through m³, so 1 m³ always shows as exactly 1,000 L.
For brass, a Bombay High Court judgment of 8 March 2024 (AIGP Developers v. State of Maharashtra, footnote 1) records that 100 cubic feet of excavated mineral make 1 brass. Sources checked 21 October 2026.
CFT calculator FAQ
How do I calculate CFT from length, breadth and height?
Multiply all three dimensions in feet, after converting inches to feet (divide by 12). A 12 ft 6 in × 10 ft slab, 6 in thick, is 12.5 × 10 × 0.5 = 62.5 cft.
How many cubic feet are in one cubic metre?
1 m³ = 35.3147 cft (rounded). Multiply m³ by 35.3147 for cft, or divide cft by 35.3147 for m³.
How do I convert cft to brass and brass to cft?
1 brass = 100 cft. Divide cft by 100 for brass: 250 cft = 2.5 brass. Multiply brass by 100 for cft: 3 brass = 300 cft. One brass is about 2.83 m³.
How many litres are in one cubic foot?
1 cft = 28.3168 litres (rounded). Multiply cft by 28.3168 for litres, or divide litres by 28.3168 for cft. 100 cft is about 2,831.68 litres.
Can this calculate timber CFT?
Yes, for rectangular sawn timber: length in feet × breadth in inches × thickness in inches ÷ 144. A piece 10 ft long, 6 in wide and 3 in thick is 10 × 6 × 3 ÷ 144 = 1.25 cft. Round logs are measured differently (Hoppus), so this doesn't apply to them.
Is this the amount of sand to order for a concrete slab?
No. Slab dimensions give the finished concrete volume. The concrete and sand calculators add the dry-volume factor and split the mix into cement, sand and aggregate.
How many cft does a truck or tractor hold?
It depends on the body, so measure it. Multiply the inside length × width × level fill depth in feet: a 12 × 6 ft body filled 2 ft deep holds 144 cft, or 1.44 brass. A heaped load needs a separate measurement.
Need item-wise quantities for a whole building? Send the drawings for a BOQ from your drawings.