Seconds to kilometers per second (exhaust velocity)
Type a value in s to get it in km/s instantly.
3.432km/s
That's 1.01× as efficient as a Merlin vacuum engine, while a Space Shuttle main engine in vacuum is 1.29× more efficient. Its exhaust leaves at about 3.432 km/s.
Convert the other way: km/s to s
What it means
How efficient is that engine?
Rocket figures are typical published values, at sea level unless marked vacuum. The jet-engine figure is for an airliner at cruise.
The math
How to convert s to km/s
To convert seconds to kilometers per second (exhaust velocity), multiply by 0.00980665.
Example: 350 s × 0.00980665 = 3.43233 km/s.
In the other direction, 1 km/s = 101.972 s.
Every unit
Your specific impulse in every unit
Tables
s to km/s conversion table
| s | km/s |
|---|---|
| 200 s | 1.96133 km/s |
| 250 s | 2.45166 km/s |
| 282 s | 2.76548 km/s |
| 300 s | 2.94199 km/s |
| 350 s | 3.43233 km/s |
| 380 s | 3.72653 km/s |
| 450 s | 4.41299 km/s |
| 900 s | 8.82599 km/s |
| 1,600 s | 15.6906 km/s |
| 3,000 s | 29.4199 km/s |
km/s to s conversion table
| km/s | s |
|---|---|
| 200 km/s | 20,394.3 s |
| 250 km/s | 25,492.9 s |
| 282 km/s | 28,756 s |
| 300 km/s | 30,591.5 s |
| 350 km/s | 35,690.1 s |
| 380 km/s | 38,749.2 s |
| 450 km/s | 45,887.2 s |
| 900 km/s | 91,774.5 s |
| 1,600 km/s | 163,155 s |
| 3,000 km/s | 305,915 s |
Quick answers
Quick answers
- How many km/s is 1 s?
- 1 s is 0.00980665 km/s.
- How many km/s is 10 s?
- 10 s is 0.0980665 km/s.
- How many km/s is 350 s?
- 350 s is 3.43233 km/s.
The units
About these units
Seconds (s)
The usual rocketry figure, the same in every unit system.
Kilometers per second (exhaust velocity) (km/s)
Exhaust velocity for electric thrusters.
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