Use the Mercury Propeller Calculator to determine the ideal propeller size and pitch for your Mercury outboard motor. Improve efficiency, speed, and performance.
Propeller Selection Results
Project: | Boat Type:
| Metric | Value |
|---|---|
| Propeller Diameter | |
| Propeller Pitch | |
| Blade Count | |
| Propeller Model | |
| Propeller Slip | |
| WOT RPM | |
| Thrust | |
| Top Speed |
Show unit definitions
Metric Units:
- Meters (m): Length (1 m ≈ 39.37 in)
- Kilometers per hour (km/h): Speed (1 km/h ≈ 0.621 mph)
- Kilograms (kg): Weight (1 kg ≈ 2.205 lb)
- Newtons (N): Force (1 N ≈ 0.225 lbf)
- Inches (in): Length (1 in ≈ 0.0254 m)
- Miles per hour (mph): Speed (1 mph ≈ 1.609 km/h)
- Pounds (lb): Weight (1 lb ≈ 0.454 kg)
- Pounds-force (lbf): Force (1 lbf ≈ 4.448 N)
Understanding Your Results
- Propeller Diameter: The width of the propeller’s blade circle. Larger diameters suit heavier boats or lower RPMs.
- Propeller Pitch: Distance the boat moves forward per revolution. Lower pitch improves acceleration; higher pitch increases speed.
- Blade Count: Number of blades (3 or 4). 4-blade props offer better acceleration and handling, 3-blade for top speed.
- Propeller Model: Recommended Mercury propeller family (e.g., Black Max, Trophy Plus).
- Propeller Slip: Difference between theoretical and actual boat movement (10–20% is typical).
- WOT RPM: Engine RPM at full throttle. Should be within the manufacturer’s range (e.g., 5000–5500 RPM).
- Thrust: Force pushing the boat forward. Higher thrust improves acceleration.
- Top Speed: Estimated maximum speed with the recommended propeller.
Note: Results are estimates based on simplified models. Consult a Mercury dealer for final selection. Visit Mercury Prop Selector.
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