Specific Impulse Calculator
Free calculate specific impulse (isp), exhaust velocity, and thrust efficiency for rocket engines. determine isp from thrust, mass flow rate, and exhaust velocity.
Input Parameters
s
s
Results
Enter parameters to calculate specific impulse
Specific Impulse Formulas
Specific Impulse
Isp = F / (ṁ × g₀)
Where:
- • Isp = specific impulse (s)
- • F = thrust (N)
- • ṁ = mass flow rate (kg/s)
- • g₀ = standard gravity (9.80665 m/s²)
Exhaust Velocity
vₑ = Isp × g₀
Common Isp Values
- • Chemical rocket: 200-450 s
- • Ion thruster: 2000-5000 s
- • Hall thruster: 1000-2000 s
- • Nuclear thermal: 800-1000 s