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Ideal Rocket Delta-v — result sheet
Estimate ideal rocket velocity change from specific impulse and initial and final mass.
Inputs used
Results
Visual chart
Breakdown
Calculation steps
Returned data table
Formula and methodology
Formula: Delta-v = Isp g0 ln(m0/mf), with g0 = 9.80665 m/s^2.
The ideal rocket equation estimates velocity change from effective exhaust performance and mass ratio. It is a propulsion reference calculation, not a mission design, launch approval, or trajectory prediction.
This result follows the calculator's declared inputs, precision, validation boundaries, and model limits.
Input contract
- Specific impulse — s; minimum 1.0E-6; maximum 100000
- Initial mass — mass units; minimum 1.0E-6; maximum 1000000000000
- Final mass — same mass units; minimum 1.0E-6; maximum 1000000000000
Worked example
| Input | Value |
|---|---|
| Specific impulse | 300 |
| Initial mass | 1000 |
| Final mass | 600 |
Ideal delta-v is about 1499.9 m/s.
Assumptions and limits
- Initial mass is greater than final mass and both masses use the same unit.
- Specific impulse is expressed in seconds and standard gravity is used.
- Gravity losses, aerodynamic drag, steering losses, staging details, and finite-burn trajectory are not modeled.
Calculator note
Source and methodology
Use the official WorldCalculate methodology policy for the source, formula, precision, and boundary standards behind this calculator.
Planning estimate, not financial, medical, legal, or professional advice. © WorldCalculate — reuse with attribution. Built and curated by Hassan ALRowaie.
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