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USPS Shipping & Postage Calculator
Instantly calculate USPS postage and shipping rates, compare services, and unlock up to 87% off — all with ShipStation.
Whether you’re shipping a single First Class envelope or managing high-volume eCommerce orders, ShipStation’s USPS Shipping & Postage Calculator helps you get fast, accurate quotes — and save more on every label.
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- Real-time USPS postage estimates
- Compare USPS Ground Advantage®, Priority Mail®, First-Class®, and more
- Access discounted commercial rates — no volume required
- Print labels, schedule pickups, and manage all your shipping in one place
Start calculating now →
How to Use the USPS Shipping & Postage Calculator
Get a quick USPS shipping estimate in 3 easy steps:
- 1. Enter your origin and destination ZIP codes
- 2. Input package weight and dimensions
- 3. Compare USPS services and rates instantly
Pro tip: Accurate package dimensions matter. Oversized or underfilled boxes may trigger dimensional weight pricing.
Compare USPS Shipping Services
Not sure which USPS service is right for your shipment? Here’s a breakdown of the most common USPS services supported by ShipStation.
| Service | Delivery Time | Weight Limit | Price (starting from) | Best For |
|---|---|---|---|---|
| Ground Advantage | 2–5 business days | Up to 70 lbs | $6.98 | Everyday shipping |
| First-Class Mail® | 1–5 business days | Up to 13 oz | $4.75 | Envelopes, postcards, small parcels |
| Priority Mail® | 1–3 business days | Up to 70 lbs | $8.25 | Packages with tracking |
| Priority Mail Express® | Overnight–2 days | Up to 70 lbs | $26.95 | Urgent shipments |
| First Class Intl® | 7–21 days | Up to 4 lbs | Varies | Budget international shipping |
Ready to see your rate? Try the USPS Shipping Calculator now and access exclusive ShipStation discounts.
Access Low USPS Shipping Rates & More
Why Use ShipStation to Calculate USPS Rates?
Unlike the USPS website or other shipping tools, ShipStation’s calculator does more than just give you a number. Key Benefits:
Want to go beyond rates? Discover how ShipStation simplifies your entire shipping process — from orders to delivery.
Tips to Save on USPS Shipping
Small changes = big savings. Here’s how to reduce your USPS shipping costs:
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- Use the smallest box possible: Avoid dimensional weight surcharges.
- Leverage Flat Rate options: Especially for small and heavy items.
- Compare rates for every shipment: ShipStation does it automatically.
- Use USPS Ground Advantage for non-urgent deliveries.
- Batch print to save time and cost on high-volume shipping days.
USPS Shipping & Postage Calculator – FAQs
How to calculate shipping costs with USPS?
How are USPS shipping costs calculated?
USPS calculates rates based on:
- Package weight
- Size/dimensions (for dimensional pricing)
- Shipping zone (distance from origin to destination)
- Service selected (Ground, Priority, Express)
- Packaging type (e.g., Flat Rate, custom box)
Does USPS charge by weight or size?
How to calculate USPS shipping cost by weight?
How do I calculate USPS international shipping?
How to calculate USPS shipping costs for small businesses?
How do I get USPS commercial rates?
Ready to Get the Best USPS Rates?
Whether you ship 5 packages a month or 500, ShipStation’s USPS calculator makes it easy to get the best rates — and manage your entire shipping process in one place. Want to ship smarter?