Rocket Thrust Calculator

Find rocket thrust from propellant flow and exhaust velocity.

Propellant flow (kg/s)

Exhaust velocity

Thrust (N) 700,000

Formula: F = ṁ · v_e

Step-by-step with your numbers:

1. Values used:

2. Propellant flow = 250 kg/s

3. Exhaust velocity = 2,800

5. Thrust = Propellant flow x Exhaust velocity = 250 x 2,800 = 700,000N

Did we solve your problem today?

Rocket thrust comes from throwing mass out the back at high speed.

The math behind it

F = ṁ·v_e (ignoring pressure terms). More flow or faster exhaust gives more thrust.

250 kg/s at 2800 m/s → 700 kN.

How do rockets work in space?

By Newton's third law — expelling exhaust pushes the rocket forward, no air needed.