A cubic foot is exactly 0.028316846592 cubic meters.
Cubic feet to Cubic Kilometers Converter — ft3 to km3
Convert Cubic foot (ft3) to Cubic Kilometer (km3) using the exact conversion factor (1 cubic foot = 2.831685e-11 cubic kilometer). See the formula, worked examples, conversion table, history, and common uses.
Cubic feet to Cubic Kilometers converter
Converter
Volume Converter
Convert metric, US customary, imperial, cooking, dry, and industrial volume units.
Context values
Some unit families need one extra value for a physically accurate result.
Cubic metric volume unit.
Result = input x 0.02831684659 / 1e+9.
Volume uses the cubic meter as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Cubic feet to Cubic Kilometers
Cubic foot and Cubic Kilometer appear side by side at fuel pumps and on beverage labels, since the US measures liquids in gallons while most of the world uses liters. Cubic foot is most often used for us natural gas utility billing (often in hundreds or thousands of cubic feet).
Formula
cubic kilometers = cubic feet × 2.831685e-11
This factor comes from each unit's defined relationship to the category's base unit: 1 cubic foot equals 0.028316846592 base units, and 1 cubic kilometer equals 1000000000 base units, so dividing one by the other gives the direct cubic foot-to-cubic kilometer factor of 2.831685e-11.
Simple example
1 ft3 × 2.831685e-11 = 2.831685e-11 km3
1 cubic foot = 2.831685e-11 cubic kilometers.
Real-world example
10 ft3 × 2.831685e-11 = 2.831685e-10 km3
10 cubic feet = 2.831685e-10 cubic kilometers.
Conversion table
| Cubic foot (ft3) | Cubic Kilometer (km3) |
|---|---|
| 1 ft3 | 2.831685e-11 km3 |
| 5 ft3 | 1.415842e-10 km3 |
| 10 ft3 | 2.831685e-10 km3 |
| 25 ft3 | 7.079212e-10 km3 |
| 50 ft3 | 1.415842e-9 km3 |
| 100 ft3 | 2.831685e-9 km3 |
Reverse conversion: Cubic Kilometer to Cubic foot
2.831685e-11 km3 × 35314666720 = 1.00000012 ft3
2.831685e-11 cubic kilometers = 1.00000012 cubic feet.
cubic feet = cubic kilometers × 35314666721.5
For a page dedicated to this direction, see Cubic Kilometer to Cubic foot.
Understanding the Cubic foot
Cubic foot (ft3) measures volume. A cubic foot is exactly 0.028316846592 cubic meters, derived from the 1959 international foot. It is classified as a US/imperial customary unit.
Where it's used: United States (construction, HVAC, natural gas billing)
Uses of the Cubic foot today
- US natural gas utility billing (often in hundreds or thousands of cubic feet)
- HVAC airflow and building-volume calculations
- Lumber, concrete, and construction material estimation in the US
History of the Cubic foot
The cubic foot, like the square foot, follows from the standardized foot (exactly 0.3048 m since the 1959 international agreement) rather than having a separate historical definition.
Historical origin. Cubic foot was not the invention of a single named person; it developed through the process described above.
Understanding the Cubic Kilometer (km3)
Cubic metric volume unit.
Cubic foot — sources
- NIST — International yard and pound (1959) — Basis for the modern foot and its derived volume unit.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many cubic kilometers are in 1 cubic foot?
1 cubic foot equals 2.831685e-11 cubic kilometers, using the exact defined conversion factor rather than an estimate.
How do I convert cubic foot to cubic kilometer?
Multiply the cubic foot value by 2.831685e-11. The converter above does this instantly to whatever precision you set.
How do I convert cubic kilometer back to cubic foot?
Use the reverse factor: 1 cubic kilometer equals 35,314,666,720 cubic feet. You can also use the swap control in the converter above to flip the direction instantly.
What is a cubic foot?
Cubic foot (ft3) measures volume. A cubic foot is exactly 0.028316846592 cubic meters, derived from the 1959 international foot. It is classified as a US/imperial customary unit.
What is a cubic kilometer?
Cubic Kilometer (km3) is a unit of volume.
Is the cubic foot to cubic kilometer conversion exact?
Yes. A cubic foot is exactly 0.028316846592 cubic meters, derived from the 1959 international foot. That fixed definition is what the converter above uses, so any rounding you see is a display choice, not a limitation of the math.
Where is the cubic foot still used today?
United States (construction, HVAC, natural gas billing)