Enter the waterline length of a moving boat into the calculator to determine the estimated boat speed.

## Boat Speed Formula

The following equation can be used to calculate the boat speed.

S = 10.34*(WLS/WLM)-10.34

- Where S is the boat speed in knots
- WLM is the waterline length when moving (feet)
- WLS is the waterline length when stopped (feet)

## FAQ

**What is a water line length?**

A water line length of a boat that is in contact with water.

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