Below is a chart of how many stamps are required for different envelope sizes (all under 20mm thickness).
As standard, Design Mummy provides 130mm x 190mm envelopes for Wedding Invitations and C6 envelopes for RSVP and Birthday invitations.
| Envelope Size | Postage Stamps Required |
|---|---|
| 11B Envelope (145mm x 90mm) | 1 postage stamp |
| C4 Envelope under 250g (324mm x 229mm) | 3 postage stamps |
| C4 Envelope under 500g (324mm x 229mm) | 5 postage stamps |
| C6 Envelope (162mm x 114mm) | 1 postage stamp |
| 5″ x 7″ Envelope (includes 130mm x 190mm Invitation iFlap Envelope) | 1 postage stamp |
| C5 Envelope (229mm x 162mm) | 2 postage stamps |
| DL Envelope (220mm x 110mm) | 1 postage stamp |
| Reply Envelope (130mm x 80mm) | 1 postage stamp |
| Square Envelopes (any size) | 2 postage stamps |
