Things You'll Need
Instructions
Remove any pictures or glass fragments from the frame to leave just the hollow frame.
Place the fabric measuring tape on the inside of the frame. Fabric tape is thin, flexible and will be easier to measure the inside of the frame.
Hold the tape inside the frame with your non-dominant hand at the bottom of the width-side of the frame.
Pull the tape up with your other hand to the top of the width-side of the frame. Always remember that you are measuring the inside of the frame where the glass will go.
Record the inches of the width-side.
Repeat the process for the length-side of the frame. Record the number in inches.
Take the measurements to a frame shop where they can cut the exact piece of glass that you will need for your frame.