calculatorsonline.co.uk
Propeller Diameter Calculator
Estimate propeller diameter from engine power and shaft speed.
π’ Free Online Tool
β‘ Instant Results
π Clear Comparison
π 100% Free Tool
Diameter
Compare Your Options And Get Clear Answers
Estimate propeller diameter from engine power and shaft speed.
Propeller Diameter Estimator
Enter your numbers below for an instant estimate.
0
π‘ Tip: Lower shaft RPM generally calls for a larger diameter.
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
Propeller Quick Guide
Typical values for reference.
| Power | RPM | Diameter | Boat |
|---|---|---|---|
| 100 hp | 2500 | ~14 in | Small |
| 300 hp | 1500 | ~24 in | Medium |
| 500 hp | 1200 | ~30 in | Large |
| 1000 hp | 900 | ~42 in | Yacht |
| Rule of Thumb | Check inputs | Use as a guide | Round sensibly |
Common Questions
Propeller Diameter Calculator FAQ
Answers to common questions about this calculator.
From engine power, shaft speed and hull type.
It gives a quick estimate of propeller diameter 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.