Welcome to Sail Calculator

Example: what length to displacement ratio would be best for a 43 foot sailboat planing ocean voyages?

Making an upwind passage?

Milage upwind

Degrees off the wind (Course made good (CMG), including drift)

Are we there yet?

Whats my ETA?

Estimated average speed

Nautical Miles / hr

Estimated distance

Nautical Miles

What's my average speed over passage?

Distance

Total time of trip:

Days

Hours

Minuets

How much load is on my rig?

Calculate sheet loads

Main sail foot length:

Square

Luff length of main

Square Feet

Length from aft end of boom to mainsheet attachment

Square Feet

Wind Speed

Vessels Hull Speed

How fast can we go?

Use this calculator to find your theoretical hull speed.

Boat's waterline length

Sail Displacement

Total sail area

square

Total vessel displacement

Length to Displacement

Displacement:

Length at waterline (LWL):

Calculate your capsize screen ratio.

Displacement:

Beam:

Calculate Comfort Ratio.

Displacement:

Beam:

length of waterline:

length overall: