the masts came in 2 heights 39 and 42' +/- you should measure your mast yourself, especially if you are going to part with money. Put a line n a halyard hoist it to the top, mark it. bring it back, then measure it. some people tape a measure to the halyard, but if it comes untaped you are screwed. So tie a rope on, it is more sure. It will give you a close enough measurement. Then you can take the rough measurement to the specs section on the site for the exact numbers. The first numbers you asked about are within a couple inches of the measurements I sent you and are in decimals. If my mental figures are correct it is approx. 41'3& 3/4" AND 21' 2&1/4" each sail maker will tweak the numbers a bit and then there is stretch so unless you are racing close enough is close enough! Hope it helps Edd