Features & Capabilities

Designed for propeller calculation for marine vessels.

This calculator can determine pitch, gear ratio, RPM, propeller slip and speed parameters. Enter any four variables, and it will calculate the fifth. Use the toggle switch to choose which field to calculate.

Pitch is the theoretical forward movement for one complete turn of the propeller. Every inch of the boat in contact with the water induces drag. Therefore, the distance travelled differs since the propeller is "slipping" behind the theoretical distance it should travel with each rotation. The difference between theory and reality is called slip.

Depending on your application, slip typically ranges between 5% and 20%. A lower number is only sometimes what you are after. Slip of a prop changes with operating conditions and is not a direct measure of efficiency. Please consult professionals for guidance.

Happy powerboating

User Growth & Download Statistics

App
By:
Frode Rørvik
Rating:
3.00
(1)
Version:
3.2 Last updated: 2025-07-09
Version code:
876265884
Creation date:
2011-11-11
Compatible devices:
Size:
2.64MB
URLs:
Privacy policy
Full description:
See detailed description
Source:
Apple Apps Store
Data ingested on:
2026-06-10
Compare stats and ranking:

Contact the developer

Chrome-Stats does not own this Apple app. Please use these information below to contact the Apple app developer.
Developed by:
Frode Rørvik
Apple Apps Store
https://apps.apple.com/us/app/propeller-calc/id478119478

User Reviews

I use this App for assistance with prop selection on my RC Nito Boats. Use ratio 1 (1:1) and the rest is simple. It works well for full size boats too.
by RD*****, 2013-02-08
View all user reviews ›

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