Rocket Equation Calculator (Tsiolkovsky)

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Calculates the change in velocity (delta-v) a rocket can achieve based on propellant mass and exhaust velocity.

How To Use

How to use this calculator

Start with your values, or try a preset.

Step 1

Enter Initial Mass (kg), Final Mass (kg), and Exhaust Velocity (m/s) in the units shown.

Step 2

Read Delta-V (m/s) and Propellant Mass (kg) in the results panel. Results update as you change the inputs.

Step 3

Choose a preset to load an example, then adjust the values for your situation.

Worked Examples

See the inputs and their calculated results.

Initial Mass (kg): 1,000 kg; Final Mass (kg): 800 kg; Exhaust Velocity (m/s): 2,500 m/s

Delta-V (m/s): 557.8588783 m/s; Propellant Mass (kg): 200 kg

Initial Mass (kg): 5,000 kg; Final Mass (kg): 2,500 kg; Exhaust Velocity (m/s): 3,000 m/s

Delta-V (m/s): 2,079.441542 m/s; Propellant Mass (kg): 2,500 kg

Initial Mass (kg): 10,000 kg; Final Mass (kg): 4,000 kg; Exhaust Velocity (m/s): 3,500 m/s

Delta-V (m/s): 3,207.017562 m/s; Propellant Mass (kg): 6,000 kg

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