Measuring for replacement vinyl windows

Hi, I am measuring for replacement windows and the internet is contradictory on this, I have the interior trim off and I am going to measure the outside edge of the Jambs (the exposed wooden box the window sits in) side to side and top to bottom. is this right? Thanks
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Yes, in 3 different places. Width: top, middle and bottom Height: left, middle and right
Use your highest measurement, also make sure you make your vertical measurement from directly inside the sill. Best device to use is a carpenters rule with the 8" slide on one end. Standard tapes can cause you to be off sometimes up to 1/4". The manufacturers take your measurements and subract either 1/8, 1/4 or even 1/2 so you need to be as close as possible.
example: Width: (top)2, (middle)2 1/8, (bottom)2 1/4 Hieght: (left side)Q 1/8, (middle)Q 1/4, (right side)Q 1/8
Your replacement window would be 32 1/4 x 51 1/4
Good luck! -Brian

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Measure outside too. My house the outside was smaller than inside and they could not get windows all the way in so I lost half my window sill. May have been because of siding but I would check for sure and you want to use the smallest measurement measure middle too!
Wayne

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