Calculate the efficiency of your propeller by determining the slip percentage.
Measured Performance
Calculation Results
Enter pitch, RPM, and speed
About this calculator
Overview
Propeller slip is the difference between the theoretical distance the propeller should move forward and the actual distance it moves through the water or air.
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Pro Tips
Slip = (Theoretical Speed - Actual Speed) / Theoretical Speed.
A high slip often indicates the propeller is poorly matched to the engine or vessel.
Negative slip is theoretically impossible but might occur due to current or inaccurate speed measurements.
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Fun Facts
"Most outboard motorboats operate with 10% to 15% slip at full throttle."
"Heavier boats generally experience more slip than lighter, faster hulls."
"Propeller cup and rake are design features used to reduce slip and increase grip."
