How to Buy Forever Stamps for Wedding Invitations in 2026

Wedding invitations are one of the most common reasons people buy Forever Stamps in bulk. Unlike everyday mail, wedding invitations usually include RSVP cards, maps, and other inserts that affect postage. This guide explains exactly how many Forever Stamps to buy for your wedding, when to buy them, and how to save money by purchasing in advance.

How Much Postage Do Wedding Invitations Need?

The postage required for a wedding invitation depends on the weight and shape of your envelope. The current USPS First-Class Mail rate is $0.73 per one-ounce letter (July 2026), but most invitation suites weigh more than one ounce.

Standard invitation (under 1 ounce)

A single invitation card in a standard #10 business envelope typically weighs just under one ounce. You need 1 Forever Stamp per envelope.

Invitation suite with RSVP (1 to 2 ounces)

Most couples send an invitation card plus a separate RSVP card with its own envelope. Together, the suite usually weighs 1.5 to 2 ounces. You need 2 Forever Stamps per mailing (one for the invitation, one for the RSVP).

Square or unusual envelopes

Square envelopes or invitations with ribbons, wax seals, or thick cardstock are considered non-machinable and require an extra $0.44 non-machinable surcharge in addition to the regular First-Class rate. Most couples add one extra Forever Stamp to cover this surcharge.

Oversized or heavy invitations (over 2 ounces)

Heavy or oversized invitations may need additional postage in $0.20 or $0.30 denominations. USPS sells “additional ounce” stamps for this purpose.

How Many Forever Stamps to Buy for Your Wedding

Use this simple formula to calculate the total stamps needed:

1. Count your guest list (typically 75–200 guests)
2. Add 10–15 extra sets for keepsakes, vendors, and last-minute additions
3. Multiply by the number of Forever Stamps required per mailing (usually 2–3)
4. Add postage for save-the-dates and thank-you cards

Examples:

• 100 guests, standard suite (2 Forever Stamps each): 230 stamps (100 invitations × 2 + 30 RSVP returns)
• 150 guests, square invitation (3 Forever Stamps each): 480 stamps (150 × 3 + 30 RSVP returns)
• 200 guests, heavy suite (3 Forever Stamps each): 630 stamps (200 × 3 + 30 RSVP returns)

Recommendation: Add a 10% buffer for any last-minute guests, mistakes, or re-mailings.

When to Buy Wedding Forever Stamps

The best time to buy Forever Stamps for wedding invitations is 4 to 6 months before the wedding. This timing gives you several advantages:

• Rate protection. Forever Stamps bought today lock in the current USPS rate. If USPS raises rates before your wedding, your stamps still cover the new rate.
• Time to count and verify. Buying early lets you weigh a sample invitation at the post office to confirm your postage is correct.
• Avoid the post-office rush. Wedding season (April–October) is busy at most post offices. Buying online avoids the line.
• Bulk savings. Bulk Stamps US offers 100-stamp and 1,000-stamp packs at lower per-stamp prices than retail post offices.

Which Forever Stamp Design Is Best for Weddings?

Forever Stamps come in many designs. The right choice depends on your wedding style:

• Classic and formal: Forever Stamp with the U.S. flag or the USPS love stamp series
• Modern and minimal: Plain Forever Stamps with simple geometric or floral motifs
• Seasonal: Commemorative Forever Stamps that match your wedding season

Browse our commemorative Forever Stamps for seasonal designs and our flag stamp collection for the classic American flag design.

Buying Forever Stamps in Bulk for Weddings

Bulk Stamps US offers several wedding-friendly options:

• 20-stamp sheet: Perfect for a small wedding (under 30 guests) or a sample order
• 100-stamp pack: Ideal for a medium-sized wedding (50–100 guests) when 2 stamps per invitation are needed
• 500-stamp bulk lot: Best value for large weddings (150+ guests) or combined invitation + thank-you + save-the-date postage

All bulk orders ship free within the U.S. and arrive in 3–7 business days. We recommend placing your order at least 8 weeks before you plan to mail invitations.

Weighing Your Wedding Invitations

USPS charges by weight for First-Class Mail. To make sure your Forever Stamps cover the postage:

1. Assemble a full invitation suite (invitation, RSVP, envelope, any inserts)
2. Take it to your local post office and ask them to weigh it
3. Confirm the postage required with the postal clerk
4. Buy the exact number of Forever Stamps you need, with a small buffer

Common Wedding Postage Mistakes

• Forgetting the RSVP envelope. Each RSVP envelope counts as a separate mailing and needs its own Forever Stamp.
• Square envelope surcharge. Square envelopes are non-machinable and require extra postage.
• Hand-canceling requests. If you want your invitations hand-canceled (to avoid machine marks), add $0.05 per envelope.
• International guests. International wedding invitations require Global Forever Stamps, not domestic Forever Stamps.

Save-the-Dates and Thank-You Cards

Save-the-dates typically go out 6–8 months before the wedding. Each save-the-date is usually a single postcard, requiring 1 Forever Stamp. Thank-you cards go out after the wedding and also require 1 Forever Stamp per envelope. Plan for 1.5 to 2 times your guest list in additional stamps for these mailings.

Why Buy Wedding Forever Stamps from Bulk Stamps US

Bulk Stamps US is an independent online retailer specializing in Forever Stamps for weddings, home, and business mailing. We are not affiliated with USPS, but every stamp we sell is genuine USPS-issued postage. Founded in 2021, we have served thousands of couples and small businesses with bulk Forever Stamps at volume pricing.

• Free U.S. shipping on every order
• 1–2 business day order processing
• Climate-controlled storage to protect stamp quality
• 30-day return policy on unopened products
• Bulk pricing below post-office retail rates

Frequently Asked Questions

How many Forever Stamps do I need for 100 wedding invitations?

For a 100-guest wedding with standard invitation suites, plan for 200 to 250 Forever Stamps. Add 30 extra for RSVP return envelopes and a 10% buffer for re-mailings or last-minute additions.

Do Forever Stamps work for square wedding invitations?

Yes, but square envelopes are non-machinable and require an extra $0.44 surcharge. Most couples add one extra Forever Stamp per envelope to cover this fee.

When should I buy Forever Stamps for my wedding?

Buy your Forever Stamps 4 to 6 months before the wedding. This gives you time to weigh a sample invitation and verify your postage, and protects you from any USPS rate increases before your mailing date.

Can I use Forever Stamps for international wedding invitations?

No. Forever Stamps only cover domestic First-Class Mail. For international guests, you need Global Forever Stamps or international postage stamps.

Where can I buy Forever Stamps in bulk for a wedding?

Bulk Stamps US offers 20-stamp sheets, 100-stamp packs, and 500-stamp bulk lots at volume pricing. All orders ship free within the U.S. and typically arrive within 3–7 business days.

Sources

• USPS First-Class Mail – one-ounce and additional ounce rates
• USPS How to Mail Letters – square envelope surcharge
• The Knot – Wedding Postage Guide

Last updated: July 8, 2026. Postage rates reviewed monthly against USPS announcements.