How much postage does a wedding invitation need?

Most wedding invitations use regular letter postage. The price can change when the finished envelope is heavier than one ounce, square, stiff, lumpy, or decorated on the outside.

Check my finished invitation

Start by weighing one finished invitation

Assemble and seal one invitation exactly as a guest will receive it. Weigh that complete envelope, including every card, liner, ribbon, and seal.

Postage for one finished invitation
Finished weight	Postage
Up to 1 ounce	$0.82
Up to 2 ounces	$1.11
Up to 3 ounces	$1.40
Up to 3.5 ounces	$1.69

Square-envelope extra postage

$0.49

A square envelope adds this amount once. Some other unusual envelopes may also need it, but stiff, lumpy, or externally decorated pieces should be checked in person before you buy stamps.

What can make postage cost more?

Is it over one ounce?

Heavier invitations move into the next letter-price tier.

Is the envelope square?

Square envelopes need the extra postage shown above.

Does it feel stiff or lumpy?

Take one sealed sample to the Post Office before stamping the full batch.

Is anything attached outside?

Protect exposed wax, string, or ribbon inside a plain outer envelope.

Common wedding invitation postage costs

These examples assume a paper envelope that bends easily and has no decoration on the outside.

Rectangular · 1 ounce or less

$0.82

A typical wedding invitation in a standard paper envelope.

Rectangular · over 1 through 2 ounces

$1.11

The same kind of envelope, with a heavier invitation suite inside.

Square · 1 ounce or less

$1.31

The one-ounce letter price plus the square-envelope surcharge.

Stiff, lumpy, or decorated outside

Ask in person

Take one sealed sample to the Post Office before stamping the full batch.

When should you ask at the Post Office?

Ask in person if the finished invitation is stiff, noticeably uneven, or difficult to bend. Bring one sealed sample before buying postage for the rest.

If it has exposed wax, string, or ribbon, place it inside a plain outer envelope. Hand-canceling may be available, but it does not promise that the invitation will avoid machines later in its trip.

Check a finished invitation

USPS rules used for this guide Checked August 17, 2026

Rates and mailing guidance are checked directly against these USPS pages:

If these sources become outdated or disagree, the calculator stops giving a confident price and directs you to USPS.