Convert Cubic feet to Cubic inches
1 cubic foot is 1,728 in³. One cubic foot is exactly 1728 cubic inches.
One cubic foot is 1728 cubic inches. To convert cubic feet to cubic inches, multiply by 1728; to go the other way, divide by 1728 or multiply by 5.7870 × 10^-4. The factor is exact rather than rounded: it follows from NIST Handbook 130. Exactly 28.316846592 litres, or 7.48 US gallons.
Factor checked against the defining standard · How we check
- Cubic feet × 1728
1 * 17281,728 in³
1 cubic foot in every volume unit
| Unit | Value | Exact factor |
|---|---|---|
| US teaspoons | 5,745.038961 tsp | × 5,745.03896104 |
| US tablespoons | 1,915.012987 tbsp | × 1,915.01298701 |
| US fluid ounces | 957.5064935 fl oz | × 957.506493506 |
| US cups | 119.6883117 cup | × 119.688311688 |
| US pints | 59.84415584 pt | × 59.8441558442 |
| US quarts | 29.92207792 qt | × 29.9220779221 |
| US gallons | 7.480519481 gal | × 7.48051948052 |
| milliliters | 28,316.84659 ml | × 28,316.846592 |
| liters | 28.31684659 L | × 28.316846592 |
| imperial gallons | 6.228835459 gal (UK) | × 6.22883545904 |
| imperial quarts | 24.91534184 qt (UK) | × 24.9153418362 |
| imperial pints | 49.83068367 pt (UK) | × 49.8306836723 |
| imperial fluid ounces | 996.6136734 fl oz (UK) | × 996.613673447 |
| imperial gills | 199.3227347 gi (UK) | × 199.322734689 |
| cubic millimetres | 28,316,846.59 mm³ | × 28,316,846.592 |
| cubic centimetres | 28,316.84659 cm³ | × 28,316.846592 |
| cubic inches | 1,728 in³ | × 1,728 |
| cubic feet (as entered) | 1 ft³ | — |
| cubic yards | 0.03703703704 yd³ | × 0.037037037037 |
| cubic metres | 0.02831684659 m³ | × 0.028316846592 |
Factors are entered by hand from NIST Handbook 130 rather than derived from a units library, so the ones that terminate are exact rather than rounded.
How do you convert cubic feet to cubic inches? The converter and the working
- 1.Take the measurement in cubic feet.
- 2.Multiply by 1728 — that is how many cubic inches fit in one cubic foot.
- 3.To go back the other way, divide by 1728, or multiply by 5.7870 × 10^-4.
Worked example: 25 cubic feet to cubic inches
- Formula
- ft³ × 1728 = in³
- Arithmetic
- 25 × 1728 = 43,200 in³
- Answer
- 25 ft³ = 43,200 in³
The factor is exact, so this figure is exact too — only the display is rounded.
Cubic feet to cubic inches conversion table
| Cubic feet | Cubic inches |
|---|---|
| 1 ft³ | 1,728 in³ |
| 2 ft³ | 3,456 in³ |
| 3 ft³ | 5,184 in³ |
| 4 ft³ | 6,912 in³ |
| 5 ft³ | 8,640 in³ |
| 6 ft³ | 10,368 in³ |
| 7 ft³ | 12,096 in³ |
| 8 ft³ | 13,824 in³ |
| 9 ft³ | 15,552 in³ |
| 10 ft³ | 17,280 in³ |
| 12 ft³ | 20,736 in³ |
| 15 ft³ | 25,920 in³ |
| 20 ft³ | 34,560 in³ |
| 25 ft³ | 43,200 in³ |
| 50 ft³ | 86,400 in³ |
| 100 ft³ | 172,800 in³ |
| 200 ft³ | 345,600 in³ |
| 300 ft³ | 518,400 in³ |
| 500 ft³ | 864,000 in³ |
| 1000 ft³ | 1,728,000 in³ |
| 2000 ft³ | 3,456,000 in³ |
| 5000 ft³ | 8,640,000 in³ |
| 10000 ft³ | 17,280,000 in³ |
What is a cubic foot?
Exactly 28.316846592 litres, or 7.48 US gallons. The working unit of natural gas billing, air flow and refrigerator capacity in the US.
What is a cubic inch?
Exactly 16.387064 millilitres, since the inch is exactly 25.4 mm. American engine displacement was quoted in it until the 1980s — a 350 small block is 5.7 litres.
How many cubic inches are in a cubic foot?
One cubic foot is 1728 cubic inches, exactly. Going the other way, one cubic inch is 5.7870 × 10^-4 cubic feet. Both figures come from the same defined relation rather than from a measurement, which is why they are the same today as they were in 1959.
Every volume unit here
The whole group — 20 units with their symbols and the size of each one in liters — is on the conversion index, along with every pair it makes. The table above already gives each of them relative to a cubic foot.
Cite this page
- APA
- Rule Calculator. (2026). Convert Cubic feet to cubic inches. Rule Calculator. https://rulecalculators.com/convert/cubic-foot-to-cubic-inch
- MLA
- "Convert Cubic feet to cubic inches." Rule Calculator, August 16, 2026, https://rulecalculators.com/convert/cubic-foot-to-cubic-inch.
- Chicago
- Rule Calculator. "Convert Cubic feet to cubic inches." Rule Calculator. Last reviewed August 16, 2026. https://rulecalculators.com/convert/cubic-foot-to-cubic-inch.
The date is when the figures on this page were last checked against their source, not the day you opened it. Add your own access date if your style needs one.
Questions people actually ask
- How many cubic inches are in a cubic foot?
- 1728. Exactly 16.387064 millilitres, since the inch is exactly 25.4 mm. American engine displacement was quoted in it until the 1980s — a 350 small block is 5.7 litres.
- How do I convert cubic inches back to cubic feet?
- Divide by 1728, or multiply by 5.7870 × 10^-4 — they are the same operation.
Other volume conversions
Cubic inches to cubic feet — the same conversion the other way.