Propeller Pitch Calculator: Optimize Boat & Marine Engine Performance

Calculate Your Theoretical Propeller Pitch

MPH
(:1)
e.g., 2.5 for a 2.5:1 ratio.
%
Typically ranges from 5% to 20%.

Results

Theoretical Propeller Pitch: inches

Easily determine the ideal propeller pitch for your boat with our free online calculator. Input your target speed, engine RPM, and gear ratio to find the theoretical pitch, helping you optimize performance and fuel efficiency. Essential for marine enthusiasts and professionals alike.

Formula:

The Prop Pitch Calculator uses the following formula to determine the theoretical propeller pitch:

P = (Vmph × 1056 × Gratio) / (Erpm × (1 - Sdecimal))

  • P: Theoretical Propeller Pitch (in inches)
  • Vmph: Target Boat Speed (in Miles per Hour)
  • Erpm: Engine Revolutions Per Minute (RPM)
  • Gratio: Gear Reduction Ratio (e.g., 2.5 for a 2.5:1 reduction)
  • Sdecimal: Propeller Slip (as a decimal, e.g., 0.10 for 10% slip)
  • 1056: A conversion constant to ensure units align correctly for speed, RPM, and pitch.

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