Envelope Size Guide
Find envelope dimensions and which paper each envelope fits.
Quick answer: enter your details below and click Show Envelope Size — your result appears instantly, right here in your browser. Nothing you enter is uploaded or stored.
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How to use
- Choose an envelope size.
- Click Show Envelope Size.
- Read its dimensions and the paper it fits.
About this tool
Choose an envelope size and the tool gives its dimensions and the paper it fits. The rule of thumb is simple: C4 fits A4 flat, C5 fits A4 folded once, C6 fits A5, and DL fits A4 folded into thirds.
Frequently asked questions
What is a DL envelope?
A long, narrow envelope, 110 by 220 millimetres, made for an A4 sheet folded into thirds — the classic business-letter envelope.
Can I post a C4 envelope normally?
Yes, but check your postal service's large-letter limits, since C4 is bigger than a standard letter.