Mechanical & Civil Engineering
Rocket Thrust Calculator
Compute rocket engine thrust from mass flow rate, exhaust velocity, and pressure thrust term.
Your inputs
Change any value to update the result instantly.
Total thrust
7,24,337.5 N
Momentum thrust
7,50,000 N
Pressure thrust
-25,662.5 N
Thrust in kN
724.338 kN
Effective exhaust velocity
2,897.4 m/s
What this calculator does
Rocket Thrust Calculator: Applies the standard aerodynamics or orbital-mechanics relationship so the force, efficiency or manoeuvre cost can be worked out from the flight inputs.
What your result means
The headline figure is the aerodynamic force, efficiency or manoeuvre cost implied by your flight inputs. Real vehicles carry additional losses and margins.
Formula and working
F = mdot·ve + (pe − p0)·Ae
- 1
Collect the inputs
Mass flow rate = 250 kg/s; Exhaust velocity = 3,000 m/s; Exit pressure = 50,000 Pa; Ambient pressure = 101,325 Pa; Nozzle exit area = 0.5 m²
- 2
Apply the formula
F = mdot·ve + (pe − p0)·Ae
- 3
Result
Total thrust = 724,337.5 N
Frequently asked questions
Symbols and assumptions
- mdot
- Mass flow rate (kg/s)
- ve
- Exhaust velocity (m/s)
- pe
- Exit pressure (Pa)
- p0
- Ambient pressure (Pa)
- Ae
- Nozzle exit area (m²)
- • Standard-atmosphere and idealised flow or two-body orbital conditions are assumed.
- • Losses, gravity turn, atmospheric drag and vehicle-specific effects are not modelled unless the page names them.
Sources and review
Reviewed 2026-09-22 · Next review 2027-09-22
- • This is an educational estimate for learning and checking, not a design deliverable.
- • Real design must follow the governing code or standard for your jurisdiction and be reviewed and signed off by a qualified engineer.
- • Safety factors, load combinations and material certification are the responsibility of the designer, not of this page.
Important limitation
This is an educational estimate based only on the values and formula shown. Verify current rates, rules, units, and professional standards before relying on the result. It is not personalized financial or investment advice.
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