Distance divided by time.
Kilometer per Seconds to Mile per Seconds Converter — km/s to mi/s
Convert Kilometer per Seconds (km/s) to Mile per Seconds (mi/s) using the exact conversion factor (1 kilometer per seconds = 0.6213711922 mile per seconds). See the formula, worked examples, and conversion table.
Kilometer per Seconds to Mile 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 1000 / 1609.344.
Speed uses meters per second as the base unit.
Reserved above the conversion cards and below the converter.
About Converting Kilometer per Seconds to Mile per Seconds
Kilometer per Seconds and Mile 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). Both are distance divided by time units.
Formula
mile per seconds = kilometer per seconds × 0.621371192237
This factor comes from each unit's defined relationship to the category's base unit: 1 kilometer per seconds equals 1000 base units, and 1 mile per seconds equals 1609.344 base units, so dividing one by the other gives the direct kilometer per seconds-to-mile per seconds factor of 0.621371192237.
Simple example
1 km/s × 0.6213711922 = 0.6213711922 mi/s
1 kilometer per seconds = 0.6213711922 mile per seconds.
Real-world example
10 km/s × 0.6213711922 = 6.213711922 mi/s
10 kilometer per seconds = 6.213711922 mile per seconds.
Conversion table
| Kilometer per Seconds (km/s) | Mile per Seconds (mi/s) |
|---|---|
| 1 km/s | 0.6213711922 mi/s |
| 5 km/s | 3.106855961 mi/s |
| 10 km/s | 6.213711922 mi/s |
| 25 km/s | 15.53427981 mi/s |
| 50 km/s | 31.06855961 mi/s |
| 100 km/s | 62.13711922 mi/s |
Reverse conversion: Mile per Seconds to Kilometer per Seconds
0.6213711922 mi/s × 1.609344 = 0.9999999999 km/s
0.6213711922 mile per seconds = 0.9999999999 kilometer per seconds.
kilometer per seconds = mile per seconds × 1.609344
For a page dedicated to this direction, see Mile per Seconds to Kilometer per Seconds.
Understanding the Kilometer per Seconds (km/s)
Distance divided by time.
Understanding the Mile per Seconds (mi/s)
Distance divided by time.
Reserved between the cards and the FAQ so the page stays balanced.
Frequently asked questions
How many mile per seconds are in 1 kilometer per seconds?
1 kilometer per seconds equals 0.6213711922 mile per seconds, using the exact defined conversion factor rather than an estimate.
How do I convert kilometer per seconds to mile per seconds?
Multiply the kilometer per seconds value by 0.6213711922. The converter above does this instantly to whatever precision you set.
How do I convert mile per seconds back to kilometer per seconds?
Use the reverse factor: 1 mile per seconds equals 1.609344 kilometer per seconds. You can also use the swap control in the converter above to flip the direction instantly.
What is a kilometer per seconds?
Kilometer per Seconds (km/s) is a unit of speed.
What is a mile per seconds?
Mile per Seconds (mi/s) is a unit of speed.
Is the kilometer per seconds to mile per seconds conversion exact?
Yes. Both kilometer per seconds and mile per seconds are defined by fixed standards rather than physical artifacts, so the factor of 0.6213711922 used above is exact to as many digits as you choose to display.