Envelope Sizes Australia: C4, C5, C6 and DL Explained

A C4 (229 x 324mm) holds an A4 sheet flat with no folding. If you fold the A4, a DL takes it in thirds, a C5 in half, and a C6 folded twice.

What does DL stand for?

DL stands for Dimension Lengthways. The envelope measures 110 x 220mm and holds an A4 sheet folded into thirds, which makes it the standard Australian business letter envelope.

What is the difference between C5 and DL?

Both carry an A4 letter with folding. A C5 (162 x 229mm) needs only one fold and suits documents you want read flat, while a DL (110 x 220mm) folds the sheet into thirds for everyday mail.

Are C4 or square envelopes more expensive to post in Australia?

A C4 usually falls into large letter postage, and square or non-standard shapes can attract higher rates. Check current Australia Post guidelines before committing to a size for a large mail run.

Do recycled envelopes work in printers and franking machines?

Yes. The recycled stock is a strong 115gsm and suits standard letter trays, office printers and franking equipment, including the windowed DL recycled envelope for automated runs.

Order Recycled Envelopes for Your Organisation

Standardising your envelope range or moving to recycled stock? The Buyecogreen team can help you match the right sizes to your mailing and set up bulk supply across DL, C4, C5 and C6. Call 1300 663 488 or email info@buyecogreen.com.au to discuss a wholesale enquiry.

Know more https://www.buyecogreen.com.au/envelope-sizes-australia-c4-c5-c6-dl/