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When you go shopping for windows, always give the dimensions as WIDTH X HEIGHT. To measure your width, you want to pull a tape measure from the top right corner to the top left corner. Measure in that 1 1/2" pocket that the window frame slides in. Measure to the sixteenth of an inch. Do the same thing at about the midway point,right above where the window locks. Then, raise the bottom sash and take the same measurement at the bottom. If you can't raise the window for whatever reason, go outside and measure from there. You will have to remove the screen though.

The majority of the time all three of those measurements will be the same. If they're not the same, use the SMALLEST measurement. Now subtract 1/4" from that measurement. This is your width for the new window. The height is a bit tricky. If your window sill outside slopes downward for water drainage, you have to make sure that you measure from the HIGHEST Point of the sill.

You want to measure from the top right corner to the bottom right corner. Put your tape at the top where the upper sash closes. If the bottom has a 5/8" high inside wood sill piece to prevent water from coming inside, you need to raise the bottom sash and run the tape past the 5/8" sill and down to the high point of the sloped sill. Do this in the middle and on the left. Once again, take the smallest measurement, but this time deduct 3/16". This is your height. If you order your windows using these dimensions,they will fit right in, and leave just enough room to adjust if needed.