Kilometers per second (exhaust velocity) to seconds
Type a value in km/s to get it in s instantly.
35,690.07s
That's 5.5× as efficient as an airliner turbofan at cruise — nothing on our list beats it. Its exhaust leaves at about 350 km/s.
Convert the other way: s to km/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 km/s to s
To convert kilometers per second (exhaust velocity) to seconds, multiply by 101.972.
Example: 350 km/s × 101.972 = 35,690.1 s.
In the other direction, 1 s = 0.00980665 km/s.
Every unit
Your specific impulse in every unit
Tables
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 |
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 |
Quick answers
Quick answers
- How many s is 1 km/s?
- 1 km/s is 101.972 s.
- How many s is 10 km/s?
- 10 km/s is 1,019.72 s.
- How many s is 350 km/s?
- 350 km/s is 35,690.1 s.
The units
About these units
Kilometers per second (exhaust velocity) (km/s)
Exhaust velocity for electric thrusters.
Seconds (s)
The usual rocketry figure, the same in every unit system.
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