Calculate the Delta-V, mass ratio, or specific impulse using the Tsiolkovsky rocket equation.
Rocket Parameters
Calculation Results
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About this calculator
Quick Reference
ΔvDelta-V (Velocity change)
v_eIsp × g₀ (Exhaust velocity)
m₀Initial mass (wet)
m_fFinal mass (dry)
g₀9.80665 m/s²
Overview
The Tsiolkovsky rocket equation describes the motion of vehicles that follow the basic principle of a rocket: a device that can apply acceleration to itself using thrust by expelling part of its mass with high velocity.
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Pro Tips
Specific Impulse (Isp) is a measure of how efficiently a rocket uses propellant.
Delta-V is the total change in velocity a rocket can achieve.
Initial mass includes all propellant, while final mass is the 'dry' weight.
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Fun Facts
"Konstantin Tsiolkovsky independently derived this equation in 1903, but it was known to British mathematicians in 1813."
"To reach Low Earth Orbit, a rocket typically needs a Delta-V of about 9.3–10 km/s."
"The equation shows that to double the Delta-V, you need to square the mass ratio!"
