Envelope Size Selector Calculator

Determine the right envelope size for your documents based on dimensions, insert count, and clearance. Includes postage tier.

Document Width (inches)

Document Height (inches)

Number of Inserts

Insert Thickness (mm each)

Clearance (mm)

Tab to move between fields

Minimum Envelope Width

8.97 in

≈ 3 credit cards

Minimum Envelope Height11.47 in

Total Insert Thickness0.012 in

Recommended Envelope5

Postage Tier2

How to Use This Calculator

Enter Document Width (inches), Document Height (inches), and Number of Inserts.
Set Insert Thickness (mm each) and Clearance (mm).
Review the Minimum Envelope Width result.
Use Minimum Envelope Height and Total Insert Thickness (in) to inform your decision.
Use the chart to visualize the results and explore different scenarios by adjusting inputs.

How the result changes with Document Width (inches)

Document Width (inches): Width of the documents or inserts.
Document Height (inches): Height of the documents or inserts.
Number of Inserts: Total number of paper inserts in the envelope.
Insert Thickness (mm each): Thickness of each individual insert. Standard 20# paper: ~0.1mm.
Clearance (mm): Extra space around documents for easy insertion. Minimum: 3mm per side.

Identify Input Parameters
4 parameters
Document Width (inches) = 8.5, Document Height (inches) = 11, Number of Inserts = 3, Insert Thickness (mm each) = 0.1 = 5 input(s) provided
Calculate Minimum Envelope Width
Minimum Envelope Width
8.97 = 8.97
Calculate Minimum Envelope Height
Minimum Envelope Height
11.47 = 11.47
Calculate Total Insert Thickness
Total Insert Thickness
0.012 = 0.012