Convert length, width, and height in meters directly to cubic meters (m³). Instant equivalents in liters, ft³, in³, gallons.
How the formula works
Cubic meters measure three-dimensional space. When length, width and height are all in meters, their product is already in m³. So V = L × W × H — no division, no unit conversion. A box 2 m × 1.5 m × 1 m is 3 m³; a room 5 m × 4 m × 2.7 m is 54 m³.
Typical uses
- Room volume — HVAC sizing, heating load, ventilation rates
- Water tanks and cisterns — storage capacity for agriculture, fire safety, residential
- Swimming pools — water volume for chemical dosing and fill time
- Concrete pours — footings, slabs, foundation volume for ordering ready-mix
- Excavation and earthworks — soil removed, backfill required, truck loads
- Shipping containers and warehouses — cargo capacity, storage planning
Typical volumes
| Space | Dimensions (m) | Volume |
|---|---|---|
| Small bathroom | 2 × 1.5 × 2.5 | 7.5 m³ |
| Bedroom (medium) | 4 × 3 × 2.5 | 30 m³ |
| Living room | 6 × 4 × 2.7 | 64.8 m³ |
| Garage (single) | 6 × 3 × 2.4 | 43.2 m³ |
| Shipping container 20 ft | 6.06 × 2.44 × 2.59 | 33.2 m³ |
| Shipping container 40 ft | 12.19 × 2.44 × 2.59 | 67.7 m³ |
Frequently asked questions
Why don't I need to divide when all inputs are in meters?
The cubic meter is defined as a cube 1 m × 1 m × 1 m. When every side of your object is expressed in meters, multiplying them directly gives volume in m³. Division is only needed when the inputs are in a smaller or larger unit — for example, cm inputs produce cm³, which must be divided by 1 000 000 to reach m³.
How do I calculate the volume of a room?
Measure length, width and floor-to-ceiling height in meters, then multiply. A rectangular bedroom of 4 m × 3 m × 2.5 m holds 30 m³ of air. For L-shaped rooms, split the footprint into two rectangles, compute each volume, and add them together. Subtract any built-in closets or dropped soffits if precision matters.
How many liters are in one cubic meter?
One m³ contains exactly 1 000 liters. So a tank 2 m × 1 m × 1 m holds 2 m³ = 2 000 L. This is the fastest way to translate tank dimensions into a water or fuel capacity you can recognize from bottle or drum labels.
What about concrete ordering?
Ready-mix concrete is sold by the cubic meter. For a slab 5 m × 4 m × 0.1 m you need 2 m³. Always add 5–10% waste for uneven subgrade, spills, and formwork absorption. Most suppliers have a minimum load (often 1 m³) and charge part-load fees below that threshold.
Meters to cubic meters for feet-based measurements?
Convert each dimension from feet to meters first (1 ft = 0.3048 m), then multiply. A garage 20 ft × 10 ft × 8 ft becomes 6.10 × 3.05 × 2.44 = 45.4 m³. Alternatively compute volume in ft³ (1 600 ft³) and multiply by 0.0283168 to get m³ — same result.
Convert three dimensions in meters directly into cubic meters without any conversion factor. The formula is V = L × W × H, because when every side is in meters, the product is already in m³. Enter length, width, height (default 4 × 3 × 2.5 m = 30 m³, a medium bedroom), optionally a number of items, and choose decimals plus thousands separator. The calculator returns volume in m³ plus automatic equivalents in liters (1 m³ = 1 000 L), cm³, mm³, ft³, in³ and US gallons. Use it for HVAC room sizing, water tanks, swimming pool capacity, concrete orders, excavation volumes, and shipping container loads. A 16 ft × 12 ft × 8 ft room converts to 4.88 × 3.66 × 2.44 m = 43.6 m³.