Tutorials

When measuring envelope dimensions, always measure with the flap side up. Envelope size is always stated in inches with the shortest dimension first. The overall size is measured from the top fold to the bottom fold and from one side to the other. Other measurement rules:

• flap width is measured from the top fold score line to the tip of the flap
• seal gum is measured from the top of the seal flap to where the gum  line stops
• throat depth is measured from the top fold score line to the lowest point on the bottom flap
• side flap is measured from the side fold to its farthest point at the envelope center

For more information about envelopes, order a copy or download a pdf of our Envelope Guide.