Convert Cubic Foot to Cubic Inch (ft³ → in³)
The cubic foot is the American standard for HVAC capacity, natural gas billing, and refrigerator volume.
Cubic Foot to Cubic Inch Conversion Table
10 common values| Cubic Foot | Cubic Inch |
|---|---|
| 1 ft³ | 1,728 in³ |
| 2 ft³ | 3,456 in³ |
| 5 ft³ | 8,640 in³ |
| 10 ft³ | 17,280 in³ |
| 20 ft³ | 34,560 in³ |
| 50 ft³ | 86,400 in³ |
| 100 ft³ | 172,800 in³ |
| 200 ft³ | 345,600 in³ |
| 500 ft³ | 864,000 in³ |
| 1,000 ft³ | 1,728,000 in³ |
How to Convert Cubic Foot to Cubic Inch Manually
Step by StepConverting cubic feet to cubic inches is straightforward: multiply by the conversion factor. Follow these three steps to do it by hand or in your head.
- 1Take your value in cubic feetStart with the number of cubic feet (ft³) you want to convert.
- 2Multiply by 1,728The conversion factor from ft³ to in³ is 1,728. Multiply your value by this number.
- 3Read the result in cubic inchesThe result is your value in cubic inches (in³).
Formula
Multiply the value in cubic feet by 1,728. For the reverse direction, multiply by 0.000579.
in³ = ft³ × 1,728ft³ = in³ × 0.000579Tips
Use these in everyday conversions- 1 ft³ = 28.317 L = 0.0283 m³.
- CFM to m³/h: multiply CFM by 1.699.
- 1 m³ ≈ 35.3 ft³.
Common Mistakes
Avoid these- Confusing ft³ with ft² in US real-estate contexts.
- Using 28 L instead of 28.32 L in precision HVAC calculations.
- Mixing CCF (100 cubic feet) with CFM (cubic feet per minute) on utility bills.
About Cubic Foot and Cubic Inch
What is the Cubic Foot?
The cubic foot equals approximately 28.317 liters (or exactly 1,728 cubic inches) and is the American standard volume unit for HVAC capacity, natural-gas billing, refrigerator interior volume, and bulk material like concrete or mulch. American gas utilities measure delivered gas in 'CCF' (hundred cubic feet) or 'MCF' (thousand cubic feet), even when the customer thinks in terms of monthly bills. Refrigerators are advertised by their interior cubic-foot capacity (typical home unit: 18–25 ft³). Air-conditioning systems are rated in CFM (cubic feet per minute) airflow. Concrete is sometimes priced by the cubic yard (27 ft³), and mulch and topsoil are often sold by cubic foot bags. The cubic foot relates to the cubic yard (27 ft³ = 1 yd³), the cubic inch (1,728 in³ = 1 ft³), the cubic meter (1 ft³ ≈ 0.0283 m³), and the gallon (1 ft³ ≈ 7.481 US gal).
- US air-conditioning and ventilation flow (CFM)
- US natural gas consumption
- Refrigerator and freezer capacity in the US
A typical US fridge is 20 cu ft (566 L). US HVAC flow rated in CFM. US residential gas billed per 100 cu ft (CCF).
What is the Cubic Inch?
The cubic inch equals exactly 16.387064 cubic centimeters and is the traditional American unit for engine displacement and small-volume manufacturing measurements. Classic American muscle cars were famously identified by their cubic-inch engine size: the Ford 'Boss 429' had a 429-cubic-inch (7.0-liter) V8, and the Chevrolet 'Big Block 454' was 7.4 liters. Modern American automakers have transitioned mostly to liter-based naming (e.g., 'Hemi 5.7'), but the cubic inch persists in vintage car culture and aviation engines. It is also used for printer-paper coverage and industrial tolerances. The cubic inch relates to the cubic foot (1,728 in³ = 1 ft³), the cubic centimeter (1 in³ ≈ 16.39 cm³), the milliliter (1 in³ ≈ 16.39 mL), and the US fluid ounce (1 fl oz ≈ 1.805 in³).
- Classic US car engine displacement
- Firearms chamber and cartridge specs
- Some US machining and mould design
350 cu in V8 = 5.7 L engine. 302 cu in Ford V8 = 4.9 L. Modern specs typically give litres.