Specific Impulse Converter
Specific impulse scale
The existing engine and reference scale connects specific impulse in seconds with effective exhaust velocity.
Isp is exhaust velocity divided by g₀
Seconds can feel abstract, so the diagram keeps the equivalent exhaust velocity visible. Higher Isp means more impulse per unit propellant flow, not necessarily more thrust.
Performance category
Good Performance
LOX/RP-1, LOX/LH2, Most bipropellants
Specific impulse
350.0 s
Standard gravity-based unit
Effective exhaust velocity
3,432.3 m/s
3.432 km/s
Thrust per mass flow
3,432.3 N/(kg/s)
11,260.9 ft/s equivalent
Open Source and Easy to Use Elsewhere
This tool is open source and the underlying logic is fully transparent. You can inspect the code, understand the calculations, and contribute improvements. If you want to use the tool in your own website, course page, or learning platform, you can also embed it directly and start from a ready-made iframe setup for this exact tool.
Open source: review the implementation and see how the results are produced.
Embeddable: preview this tool, copy the iframe, and use it in your own site or LMS.