Physics

Rocket Equation Calculator

Find delta-v from specific impulse and mass ratio.

Specific impulse

Initial mass

Final mass

Calculated Output

Delta-v 3,542.08

Exhaust velocity 2,942

Formula: Δv = Isp·g₀·ln(m₀ ÷ m_f)

Step-by-Step Breakdown

1. Values used:

2. Specific impulse = 300

3. Initial mass = 10,000

4. Final mass = 3,000

6. Delta-v = 3,542.08

7. Exhaust velocity = 2,942

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The math behind it

Exhaust velocity v_e = Isp·g₀, then Δv = v_e·ln(m₀/m_f).

Isp 300 s, 10000 → 3000 kg → about 3543 m/s.

What is specific impulse?

A measure of engine efficiency: exhaust velocity divided by g₀.