Get a tape and measure it, there are no calculations just read the measurement off the tape.
However, if it is glass your measuring i.e. for replacement remeber to add 8mm each side for the glazing in. If its a frame your measuring again for replacement remember to add at leaset 25mm of the windows will not fit the reveal.
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How do calculate spiral length of Spiral rings
Calculate the area of the room. Calculate the area of the window (or whatever opening) Room Area*100/Window Area
how to calculate the elbow radius or elbow length
-- Measure or calculate the length of one side. -- Measure or calculate the length of another side. -- Measure or calculate the length of the only remaining side. -- Add the three numbers. The sum is the perimeter of the triangle.
There is no formula to calculate the length of a wire. The length of a wire is determined by the distance from the power source to where the load is situated.