Calculate exact USPS postage costs instantly with our free calculator. Get current 2025 stamp prices, shipping estimates, and save money on domestic & international mail.
Calculate exactly how many stamps you need and total postage costs with current USPS rates
Use a kitchen scale for precise weight measurements. Round up to the nearest ounce for safety.
Use forever stamps for letters up to 1 oz. They're valid even if rates increase later.
Priority Mail Express guarantees overnight delivery to most locations by 10:30 AM or 3 PM.
Find the best shipping option for your needs and budget
| Feature | Ground Advantage | Priority Mail | Priority Express |
|---|---|---|---|
| Delivery Time | 2-5 business days | 1-3 business days | Overnight |
| Tracking | ✅ Free | ✅ Free | ✅ Free |
| Insurance (included) | Up to $100 | Up to $50 | Up to $100 |
| Free Packaging | ❌ No | ✅ Yes | ✅ Yes |
| Money-back Guarantee | ❌ No | ❌ No | ✅ Yes |
| Weekend Delivery | ❌ No | ❌ No | ✅ Available |
See detailed comparison of all USPS shipping options
Understand USPS size limits and optimize your packaging
Current postage rates updated in real-time from official USPS APIs
Within the United States
To Canada & Worldwide
Rates are fetched directly from USPS APIs and updated every 5 minutes
Rates shown for 1 lb package (6" × 4" × 2") from ZIP 90210 to 10001
Standard retail rates before any commercial discounts