How to Measure an Envelope

Measuring an envelope is a relatively simple process, but one that requires attention to detail. The way you specify the measurements of the envelope (height x width) will dictate the type of envelope you receive. Measure the height of the envelope first, from the bottom of the envelope to the base of the flap. Then measure the width. Envelopes with windows require additional measurements.

Window Size:
A – Width
B – Length

Window Location:
– From left edge of envelope
B – From bottom edge of envelope

Place envelope with flap at the top

Envelope Measuring Tool:
Line Gauge Ruler