# Cubic feet calculator

Cubic feet = length × width × height in feet; from inches, divide the cubic inches by 1,728. A 24 × 18 × 12 in box is 5,184 in³ = 3 ft³ = 0.085 m³. 1 m³ (CBM) = 35.3147 ft³; 1 ft³ = 0.0283168 m³; 1 yd³ = 27 ft³.

Interactive calculator: https://cartonmath.com/cubic-feet-calculator/
URL parameters: unit=in|ft|cm|m, l, w, h, qty. Converter parameters: m3, ft3, in3, yd3, cm3 or lit.

## Worked example

1. Box in inches: 24 × 18 × 12 in = 5,184 in³
2. Cubic feet: 5,184 ÷ 1,728 = 3 ft³
3. Cubic metres: 3 ÷ 35.3147 = 0.085 m³
4. Box in centimetres: 60 × 40 × 40 cm = 0.096 m³
5. Cubic feet: 0.096 × 35.3147 = 3.39 ft³
6. Cubic yards: 3 ft³ ÷ 27 = 0.111 yd³

## CBM to cubic feet

| CBM | Cubic feet | Cubic yards |
|---|---|---|
| 1 | 35.31 | 1.31 |
| 2 | 70.63 | 2.62 |
| 3 | 105.94 | 3.92 |
| 4 | 141.26 | 5.23 |
| 5 | 176.57 | 6.54 |
| 6 | 211.89 | 7.85 |
| 7 | 247.2 | 9.16 |
| 8 | 282.52 | 10.46 |
| 9 | 317.83 | 11.77 |
| 10 | 353.15 | 13.08 |
| 15 | 529.72 | 19.62 |
| 20 | 706.29 | 26.16 |
| 25 | 882.87 | 32.7 |
| 28 | 988.81 | 36.62 |
| 30 | 1,059.44 | 39.24 |
| 33 | 1,165.38 | 43.16 |
| 40 | 1,412.59 | 52.32 |
| 50 | 1,765.73 | 65.4 |
| 58 | 2,048.25 | 75.86 |
| 60 | 2,118.88 | 78.48 |
| 67 | 2,366.08 | 87.63 |
| 68 | 2,401.4 | 88.94 |
| 76 | 2,683.91 | 99.4 |
| 100 | 3,531.47 | 130.8 |

## Cubic feet to CBM

| Cubic feet | CBM |
|---|---|
| 1 | 0.0283 |
| 2 | 0.0566 |
| 3 | 0.085 |
| 5 | 0.1416 |
| 10 | 0.2832 |
| 20 | 0.5663 |
| 25 | 0.7079 |
| 50 | 1.4158 |
| 100 | 2.8317 |
| 200 | 5.6634 |
| 250 | 7.0792 |
| 500 | 14.1584 |
| 1,000 | 28.3168 |
| 1,172 | 33.1873 |
| 2,000 | 56.6337 |
| 2,390 | 67.6773 |

## Common box sizes

| Box (in) | ft3 | m3 |
|---|---|---|
| 6 x 6 x 6 | 0.125 | 0.0035 |
| 8 x 6 x 4 | 0.111 | 0.0031 |
| 10 x 8 x 6 | 0.278 | 0.0079 |
| 12 x 10 x 8 | 0.556 | 0.0157 |
| 12 x 12 x 12 | 1 | 0.0283 |
| 14 x 14 x 14 | 1.588 | 0.045 |
| 16 x 12 x 8 | 0.889 | 0.0252 |
| 16 x 12 x 12 | 1.333 | 0.0378 |
| 18 x 12 x 12 | 1.5 | 0.0425 |
| 18 x 18 x 18 | 3.375 | 0.0956 |
| 20 x 20 x 20 | 4.63 | 0.1311 |
| 24 x 18 x 18 | 4.5 | 0.1274 |
| 24 x 24 x 24 | 8 | 0.2265 |

## FAQ

**How do you calculate cubic feet?**
Measure length, width and height. If they are in feet, multiply them: the answer is in cubic feet. If they are in inches, multiply them and divide by 1,728, because one cubic foot is 12 × 12 × 12 = 1,728 cubic inches. A 24 × 18 × 12 in box is 5,184 in³ = 3 ft³.

**How many cubic feet are in a cubic metre (CBM)?**
35.3147 cubic feet. To convert CBM to CFT multiply by 35.3147; to convert cubic feet to cubic metres divide by 35.3147 or multiply by 0.0283168.

**How do I convert cubic inches to cubic feet?**
Divide by 1,728. For example 3,456 in³ ÷ 1,728 = 2 ft³.

**How many cubic feet are in a cubic yard?**
27, because a yard is 3 feet and 3 × 3 × 3 = 27. Divide cubic feet by 27 to get cubic yards.

**How many cubic feet is a 40 ft container?**
About 2,392 ft³ inside a standard 40 ft container (67.7 m³) and about 2,696 ft³ in a 40 ft high cube. A 20 ft holds about 1,172 ft³.

**How do I convert cubic feet to pounds?**
You need the density of what is inside: weight (lb) = cubic feet × density (lb per ft³). For freight the calculation usually runs the other way: weight ÷ cubic feet = density, which sets the LTL freight class. Use the freight class calculator for that.

Source page: https://cartonmath.com/cubic-feet-calculator/
Updated: 2026-10-06
Publisher: CartonMath (https://cartonmath.com)