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Prop Size To Engine Rpm Calculator
Estimate engine RPM from boat speed, gear ratio, pitch and slip.
🚤 Free Online Tool
⚡ Instant Results
📊 Clear Comparison
🔒 100% Free Tool
Engine RPM
Compare Your Options And Get Clear Answers
Estimate engine RPM from boat speed, gear ratio, pitch and slip.
Prop Size To Engine Rpm Estimator
Enter your numbers below for an instant estimate.
0
💡 Tip: Speed = RPM x pitch x (1 – slip) / (1056 x gear).
How It Works
Key concepts behind this calculator
1
Enter Values
Fill in each field with your own numbers.
2
Calculate
Results update as you change the inputs.
3
Review
Read the breakdown and the explanation.
4
Adjust
Change values to compare scenarios.
Quick Reference Guide
Prop Quick Guide
Typical values for reference.
| Boat | Slip | Gear | Note |
|---|---|---|---|
| Planing | 8-15% | 1.8-2.2 | Typical |
| Displacement | 20-35% | 2.0-3.0 | Heavy |
| Bass boat | 5-10% | 1.8 | Light |
| Pontoon | 10-18% | 1.9 | Mid |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Prop Size To Calculator FAQ
Answers to common questions about this calculator.
The gap between theoretical and actual speed through water.
It gives a quick estimate of prop size to engine rpm from the values you enter.
No. It is a planning estimate, so check important figures with a professional or official source.
Yes. Edit any field and the result updates when you calculate.