What You Pay Today: Single Stamp Price and Common Options
A Forever Stamp from the United States Postal Service (USPS) currently costs $0.66 as of 2025 and is designed for a 1-ounce letter mailed domestically. For larger or heavier letters, you add additional ounce charges at a lower per-ounce rate; other options include limited stamps, holiday designs, and metered stamps with the same basic pricing structure. Pricing is established by the Postal Regulatory Commission and follows a published schedule that prioritizes clarity for senders and predictability for businesses. Understanding the difference between a Forever Stamp, which remains valid for first-class one-ounce letters regardless of future price changes, and other denominated stamps is essential for accurate postage.
How to Calculate Postage for Letters and Large Envelopes
To determine how much postage you need, start by weighing your item and measuring its dimensions. First-class letters are charged by weight in ounces, with the first ounce at the base rate and each additional ounce (or fraction thereof) adding a set per-ounce charge. Nonmachinable surcharges apply to letters that are unusually thick, rigid, or shaped, while oversized letters that exceed standard size limits move into higher pricing tiers. Use the USPS price calculator or check the current Domestic First-Class Mail Price list to find exact totals based on weight, shape, and destination.
Weight and Pricing Quick Reference for First-Class Mail
| Weight (oz) | Minimum Cost (2025) | Price Type |
|---|---|---|
| 1 oz | $0.66 | Forever Stamp or First-Class Base |
| 2 oz | $0.88 | Additional ounce charge |
| 3 oz | $1.10 | Additional ounce charge |
| 4 oz | $1.32 | Additional ounce charge; may be higher for nonmachinable or oversized items |
Note: These figures reflect typical 2025 pricing for letters mailed domestically via First-Class Mail. International, Priority, and other mail classes use different structures and should be checked separately.
International and Priority Mail: Different Pricing Rules
International First-Class Package and Priority Mail International have their own rate tables based on weight and destination country. Prices are higher than domestic rates and may include customs forms and additional handling fees. Priority Mail within the U.S. depends on weight, distance, and service level, and often includes tracking. Always confirm current rates on the official USPS website or at a Post Office, especially for items that exceed standard size or weight limits.
Where and How to Buy Postage Stamps
You can purchase Forever Stamps and other denominations at Post Office locations, many retail stores, online through USPS.com, or via approved vendor stamp meters. Metered postage and online indicia provide the same value as physical stamps but are applied electronically. When buying in booklets, verify the total face value matches what you need; if not, combine stamps or add coins or additional stamps at the counter to avoid delays. For high-value or time-sensitive items, consider Priority Mail or registered services for added security and delivery confirmation.
Common Mistakes and How to Avoid Them
- Using older stamps without checking if they remain valid; most Forever Stamps are always valid, but some limited-denomination stamps may not be.
- Relying on a single stamp for heavier letters; always weigh and calculate additional ounces.
- Overlooking nonmachinable or oversized fees that can significantly increase the cost.
- Sending international items without checking the specific rate category and required forms.
- Failing to retain receipts or tracking numbers for valuable or priority mail.
Key Terms and Related Concepts
Forever Stamp: A nondenominated stamp for first-class letters that remains valid for 1 ounce regardless of future price increases. First-Class Mail: The lowest-cost tier for lightweight, timely letters and flats. Nonmachinable: Items that cannot be processed by automated equipment due to size, shape, or texture. Additional Ounce Charge: The extra amount required for each ounce or fraction beyond the first. Priority and International Mail: Faster services with tracking and specific pricing based on weight and destination.
Summary: Plan Your Postage Accurately
For a standard 1-ounce letter, one Forever Stamp at the current rate is typically sufficient. Heavier items, oversized mail, and international shipments require additional planning and higher rates. Verify weight and dimensions, check the latest price list, and choose the right service level to avoid delays and extra fees. Keep receipts and tracking details for peace of mind, and use official sources for the most reliable pricing and guidance.