Calculate Boat Speed
Enter your boat’s specifications to calculate speed
– RPM is engine revolutions per minute
– Pitch is propeller pitch in inches
– Slip is propeller slip percentage (typically 5-15%)
– Gear Ratio is the reduction ratio between engine and propeller
– 1056 is a constant that converts inches/minute to knots
Want to know how fast your boat can go? Our Boat Speed Calculator helps you estimate your vessel’s speed based on horsepower, hull type, and weight — no guesswork, just smooth sailing.
What Is Boat Speed? 🌊
Boat speed depends on several factors like engine power, hull shape, displacement, and drag. Whether you’re cruising, fishing, or racing, knowing your estimated speed helps you:
- Plan trips more efficiently
- Improve fuel economy
- Stay within safety limits
How It Works ⚙️
Just enter:
- Boat horsepower (HP)
- Boat weight (lbs or kg)
- Hull type (planing, displacement, semi-displacement)
The calculator uses a proven formula to estimate your speed in knots or miles per hour (mph).
Formula Behind the Scenes ✍️
For displacement hulls:
Speed (knots) ≈ 1.34 × √LWL (in feet)
For planing hulls:
Speed (mph) ≈ (HP / Weight) × constant (varies by hull type)
Why Use This Tool?
- Estimate speed for planning and safety
- Compare different boats or setups
- Avoid overloading your engine
- Make smarter marine decisions
FAQs ❓
Does this calculate top speed or average cruising speed?
It estimates top speed under ideal conditions. Actual speed can vary with load, wind, and water current.
Can I use this for jet skis or pontoon boats?
Yes! Just select the appropriate hull type and input accurate weight and horsepower.
