Specific Impulse Calculator

Calculate specific impulse (Isp) for rocket engines

📖 Specific Impulse

Specific impulse (Isp) measures rocket engine efficiency. It's the impulse (thrust × time) per unit of propellant mass. Higher Isp means more efficient propellant usage.

📊 Result

💡 Tips & Information

Specific impulse is measured in seconds (s)
Formula: Isp = F / (ṁ × g₀), where F is thrust, ṁ is mass flow, g₀ is standard gravity
Isp = exhaust velocity / g₀ (approximately)
Chemical rockets: 200-450 s, Ion engines: 2000-5000 s
Higher Isp means less propellant needed for same delta V

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Specific Impulse Calculator