You can use these calculators to calculate average boat speed, chain locker volume, capsize factor, and more..

**PHRF Calculator
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How Fast Is Your Boat? Calculates Approximate Average Boat Speed and Seconds per Mile Speed Differences

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**Anchor Chain Storage Calculator
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What is the chain locker volume required for self-stowing chain?

**Bobstay Calculator
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This calculator determines the tensile strength needed by the bobstay for sailboats that have bowsprits.

**Capsize Calculator
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Calculate the capsize factor for a sailboat.

**Displacement Hull Speed Calculator
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What is the maximum speed a displacement vessel attain under ordinary conditions?