Calculate your headsail overlap!

Enter your sail and "J" measurements below and press the "Calculate" button to find your overlap.

Any unit of measure is ok as long as it's consistent and just a number. So meters, inches, or feet will work, but you may need to use "decimal feet" to keep it precise, e.g., 35.5 will work, but 35' 6" will not.

Results | |
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Sail Area: | |

Luff Perpendicular: | |

Overlap(%): |