Physics

Thrust to Weight Ratio Calculator

Find the thrust-to-weight ratio of a rocket or aircraft.

Calculated Output

Thrust-to-weight ratio 2.039

Formula: TWR = thrust ÷ (mass·g)

Step-by-Step Breakdown

1. Values used:

2. Thrust = 1,000,000 N

3. Mass = 50,000

4. Gravity = 9.81 m/s²

6. Thrust / Mass = 20

7. Thrust-to-weight ratio = (Thrust x Mass) / Gravity = 20 / 9.81 = 2.039

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The math behind it

TWR = thrust ÷ weight. A value above 1 is needed to accelerate upward against gravity.

1 MN thrust, 50 t → TWR ≈ 2.04.

What TWR do rockets need?

Typically 1.2–1.5 at liftoff for an efficient ascent.