How many stamps do wedding invitations use with a wax seal?

Short answer

A wax seal usually makes your invitation heavier and bulkier, so it may need one or two stamps depending on the weight and size. You cannot know without weighing the complete envelope, so check at a post office or use an online postage calculator.

There is no fixed number of stamps for a wax-sealed invitation because the cost depends on the total weight and size of the envelope. A single standard stamp may cover a light, small card, but a wax seal adds noticeable weight and thickness. Many sealed invitations end up in a higher weight band, which means extra postage.

To get it right, assemble the invitation exactly as you will send it, including the inner envelope if you use one, the outer envelope, all inserts and the wax seal. Take that finished envelope to a post office and ask them to weigh it. They will tell you the exact postage needed. You can also use an online postage calculator at home.

Be aware that wax seals can crack or stick to other envelopes in the post. To protect them, place the sealed envelope inside a slightly larger protective envelope, or wrap each one in a sheet of tissue paper. That extra layer also adds weight, so weigh the whole thing together.

If you want to avoid extra postage, consider using a self-adhesive wax seal sticker instead of a traditional melted wax seal. It looks similar but is much lighter and flatter.