The cubic meter (m³) is the most widely-used volume unit in construction, freight, water utilities, and chemistry. Multiply the length, width, and height of any rectangular space — all in meters — and the product is your volume in m³. This calculator handles the unit conversions for you (cm, ft, in, mm) and lets you apply a per-m³ cost rate to instantly estimate the total spend.
Use it to size a concrete order, plan a furniture shipment, measure water-tank capacity, or quote a freight container by CBM.
What is a cubic meter?
A cubic meter is the SI unit for volume: the amount of space inside a cube that is exactly one meter on every side. It equals 1,000 litres, 35.3147 cubic feet, or 264.172 US gallons. Because it's the standard volume unit worldwide (except in the United States, which uses cubic feet and gallons for many trade purposes), m³ is the most common volume measurement you'll encounter in engineering, construction, shipping, and environmental data.
The cubic meter formula
All three dimensions must be in meters before multiplying. If your measurements are in another unit, convert first:
- Centimeters → meters: divide by 100
- Millimeters → meters: divide by 1,000
- Feet → meters: multiply by 0.3048
- Inches → meters: multiply by 0.0254
- Yards → meters: multiply by 0.9144
Worked example: shipping carton sized in cm
You have a carton measuring 120 cm × 80 cm × 50 cm.
- Convert each dimension: 120 ÷ 100 = 1.2 m; 80 ÷ 100 = 0.8 m; 50 ÷ 100 = 0.5 m.
- Multiply: 1.2 × 0.8 × 0.5 = 0.48 m³.
- If your shipping rate is $80/m³: 0.48 × 80 = $38.40 freight cost.
Cubic meter conversion table
| Cubic meters (m³) | Cubic feet (ft³) | Cubic centimeters (cm³) | Litres (L) | US gallons |
|---|---|---|---|---|
| 0.1 | 3.53 | 100,000 | 100 | 26.42 |
| 0.5 | 17.66 | 500,000 | 500 | 132.09 |
| 1 | 35.31 | 1,000,000 | 1,000 | 264.17 |
| 2 | 70.63 | 2,000,000 | 2,000 | 528.34 |
| 5 | 176.57 | 5,000,000 | 5,000 | 1,320.86 |
| 10 | 353.15 | 10,000,000 | 10,000 | 2,641.72 |
| 25 | 882.87 | 25,000,000 | 25,000 | 6,604.30 |
| 50 | 1,765.73 | 50,000,000 | 50,000 | 13,208.60 |
| 100 | 3,531.47 | 100,000,000 | 100,000 | 26,417.20 |
How to use this calculator
- Pick the unit you measured in (m, cm, ft, or in) from the dropdown.
- Enter length, width, and height. The calculator converts internally and computes m³ instantly.
- Optionally add a per-m³ rate and currency. The calculator multiplies the volume by your rate to estimate total cost.
- Read the result — m³, equivalent ft³, cm³, litres, and total cost if a rate was entered.
Cubic meters in shipping (CBM)
In international freight, "CBM" simply means cubic meter. Carriers price most LCL (Less than Container Load) shipments by CBM, and FCL (Full Container Load) shipments by container size. Standard usable capacities:
| Container Type | Internal Volume | Usable Cargo | Max Payload |
|---|---|---|---|
| 20-ft Standard | 33.2 m³ | ~28 m³ | ~28,200 kg |
| 40-ft Standard | 67.7 m³ | ~58 m³ | ~26,700 kg |
| 40-ft High Cube | 76.4 m³ | ~68 m³ | ~26,500 kg |
| 45-ft High Cube | 86.0 m³ | ~78 m³ | ~26,000 kg |
Air freight uses a different calculation: volumetric weight = CBM × 167. So a 1 m³ shipment is treated as 167 kg for billing purposes, even if it physically weighs less. Always check both metrics before quoting.
Cubic meters of concrete & construction
For most construction work, you'll need volumes in m³ to order ready-mix concrete, gravel, sand, or topsoil.
- Slab: length × width × thickness. Standard residential slabs are 100–150 mm thick.
- Footings: length × width × depth, computed per footing then summed.
- Walls: length × height × thickness. Subtract openings if material is volume-priced.
- Round columns: π × radius² × height. (This calculator handles rectangular volumes only; convert circles separately.)
Always order 5–10% more than the calculated volume to cover spillage, formwork imperfections, ground absorption (for concrete), and waste from cutting.
Common cubic meter mistakes
- Mixing units. If one dimension is in feet and another in meters, the result is meaningless. Convert all three to the same unit first.
- Using internal vs external dimensions. For containers, water tanks, and rooms, internal volume is what counts. External measurements give a larger number than what fits inside.
- Forgetting the height. Floor area in m² is not the same as volume in m³ — the third dimension matters.
- Not adding wastage for materials. Concrete, gravel, and aggregate need a 5–10% buffer.
- Confusing m³ with metric tons. One m³ of water = 1 ton; one m³ of steel = ~7.85 tons. Always look up the density of your material.
- Rounding too early. Round only at the final display step to avoid accumulating error across multiple dimensions.
Tips for accurate cubic meter calculations
- Measure twice. Tape measures slip and walls bow — confirm each dimension before committing to an order.
- Round to the nearest cm. Sub-centimeter precision rarely matters for m³ and avoids false-precision in the result.
- Use density for material conversions. Volume tells you space; density × volume = mass.
- For freight, also calculate volumetric weight. Carriers bill by the greater of actual weight and CBM × 167 (air) or CBM × 1000 (some sea-freight modes).
- Account for packaging. 0.5 m³ of product in cartons is usually closer to 0.6–0.7 m³ once boxes, pallets, and shrink-wrap are included.
Related calculators
- Cubic Feet Calculator — same idea, imperial units.
- Cubic Yards to Tons Calculator — convert volume to mass for landscaping materials.
- Gallon Calculator — for liquid volume.
- Meters to Feet Converter.
- Centimeters to Meters Converter.
- Cubic Yard Calculator — for US construction projects.
- Square Footage Calculator — for 2D area.
- All conversion calculators.
The bottom line
Cubic meters are the universal currency of volume. Whether you're ordering concrete, sizing a shipping container, planning HVAC ducting, or buying water for irrigation, the L × W × H formula is the same. Measure carefully, keep your units consistent, add a small buffer for real-world waste, and you'll order the right amount the first time.