Model Rocket Motor Calculator
Determine the right motor class for your model rocket based on weight, target altitude, body diameter, and drag.
Inputs
Results
Required Impulse (Ns)
85
Motor Class (1=A, 7=G+)
7
Thrust-to-Weight Ratio38.5
Estimated Altitude (ft)500
Typical Burn Time (sec)1.5
How to Use This Calculator
- Enter Rocket Weight (grams), Target Altitude (feet), and Body Diameter (mm).
- Set Drag Coefficient.
- Review Required Impulse (Ns) and Motor Class (1=A, 7=G+).
- Use Thrust-to-Weight Ratio and Estimated Altitude (ft) to inform your decision.
- Use the chart to visualize the results and explore different scenarios by adjusting inputs.
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