Feet per second.
ft/s to Kilometer per Seconds Converter — ft/s to km/s
Convert ft/s (ft/s) to Kilometer per Seconds (km/s) using the exact conversion factor (1 ft/s = 0.0003048 kilometer per seconds). See the formula, worked examples, and conversion table.
ft/s to Kilometer per Seconds converter
Converter
Speed Converter
Convert road, aviation, marine, lab, and scientific speed units.
Context values
Some unit families need one extra value for a physically accurate result.
Distance divided by time.
Result = input x 0.3048 / 1000.
Speed uses meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting ft/s to Kilometer per Seconds
ft/s and Kilometer per Seconds both describe speed, and the conversion matters whenever a maritime or aviation speed (knots) needs to be compared against a road speed (mph). Specifically: Feet per second, and distance divided by time.
Formula
kilometer per seconds = ft/s × 0.0003048
This factor comes from each unit's defined relationship to the category's base unit: 1 ft/s equals 0.3048 base units, and 1 kilometer per seconds equals 1000 base units, so dividing one by the other gives the direct ft/s-to-kilometer per seconds factor of 0.0003048.
Simple example
1 ft/s × 0.0003048 = 0.0003048 km/s
1 ft/s = 0.0003048 kilometer per seconds.
Real-world example
10 ft/s × 0.0003048 = 0.003048 km/s
10 ft/s = 0.003048 kilometer per seconds.
Conversion table
| ft/s (ft/s) | Kilometer per Seconds (km/s) |
|---|---|
| 1 ft/s | 0.0003048 km/s |
| 5 ft/s | 0.001524 km/s |
| 10 ft/s | 0.003048 km/s |
| 25 ft/s | 0.00762 km/s |
| 50 ft/s | 0.01524 km/s |
| 100 ft/s | 0.03048 km/s |
Reverse conversion: Kilometer per Seconds to ft/s
0.0003048 km/s × 3280.839895 = 1 ft/s
0.0003048 kilometer per seconds = 1 ft/s.
ft/s = kilometer per seconds × 3280.83989501
For a page dedicated to this direction, see Kilometer per Seconds to ft/s.
Understanding the ft/s (ft/s)
Feet per second.
Understanding the Kilometer per Seconds (km/s)
Distance divided by time.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many kilometer per seconds are in 1 ft/s?
1 ft/s equals 0.0003048 kilometer per seconds, using the exact defined conversion factor rather than an estimate.
How do I convert ft/s to kilometer per seconds?
Multiply the ft/s value by 0.0003048. The converter above does this instantly to whatever precision you set.
How do I convert kilometer per seconds back to ft/s?
Use the reverse factor: 1 kilometer per seconds equals 3,280.839895 ft/s. You can also use the swap control in the converter above to flip the direction instantly.
What is a ft/s?
ft/s (ft/s) is a unit of speed.
What is a kilometer per seconds?
Kilometer per Seconds (km/s) is a unit of speed.
Is the ft/s to kilometer per seconds conversion exact?
Yes. Both ft/s and kilometer per seconds are defined by fixed standards rather than physical artifacts, so the factor of 0.0003048 used above is exact to as many digits as you choose to display.