Mast step position calculator

These calculators are free to use, for guidance only and without responsibility.

FH Forestay height above deck (mast collar)

Prebend mm Normal is 1/4 to 1/2 cross section of mast longitudinal

Rake mm From FH Measured along deck (@ mast collar)

Q (Bury) Distance from deck to mast-step

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Results

Type your data in the calculator - and see results here.

Need help? See the measurement guide.

Rake °: -°

Rake degrees

Prebend %: -%

(max 1% for Furling mast, 2% for Conventional mast)

Heel Position (a): - Heel Fwd / Aft (mm)

negative = aft / positive = Fwd. From vertical

ALWAYS CHECK RESULT OF MAST CURVE ON BOARD!