# How is postage weight calculated?

### Table of Contents

- How is postage weight calculated?
- How do you calculate postage by weight at home?
- Is postage calculated by size or weight?
- How many stamps does my package need?
- How many stamps do I need for 2 ounces?
- How much does it cost to ship a 5 pound box?
- What if package is heavier than label?
- Which is the best way to estimate postage?
- How to calculate postage rates without a postage scale?
- What's the weight of a USPS mail piece?
- How to calculate the cost of USPS shipping?

### How is postage weight calculated?

If a package qualifies for USPS, **divide the length times width times height by the 166 divisor**. For all FedEx and UPS packages, you divide by 139 for any package dimensions to get the dimensional weight. The result is your new dimensional weight.

### How do you calculate postage by weight at home?

Weigh Your Item and Round Up USPS **rounds up to either the next pound (lb) or ounce** (oz). For example, if your package weighs 3 lbs 5 oz, it would be charged at the 4 lb-rate. If you have an item for shipping by First-Class Package® service that weighs 7.3 oz, it must be charged at the 8 oz-rate.

### Is postage calculated by size or weight?

Postage price of the item is based on **the actual weight or the calculated dimensional weight**, whichever is greater. Dimensional weight may apply to: USPS Retail Ground (excluding Limited Overland Routes parcels)

### How many stamps does my package need?

For a legal-sized envelope: **Two Forever stamps** (currently valued at $0.55 per stamp) are needed to mail a one-ounce legal-sized envelope (9½” by 15” envelope). Each additional ounce over the standard one ounce requires an additional $0.20 in postage (per the Janu price increases).

### How many stamps do I need for 2 ounces?

So if you are sending a 2-ounce letter you will need **$0.70 worth of** postage stamps. A letter weighing 1 ounce will need one first-class stamp. As of January 2019, a first-class stamp costs $0.55, every additional ounce is charged at $0.15.

### How much does it cost to ship a 5 pound box?

How Much Does It Cost To Ship a 5lb Package? A five-pound package costs **$7.81 to $14.32** to ship, depending on the destination and your carrier of choice. Depending on the nature of your business, if you're able to keep most shipments at five pounds or less, it can save a lot of money in the long run.

### What if package is heavier than label?

If it's heavier, you'll most likely want **Priority Mail®**; otherwise, you could be inadvertently underpaying the amount of postage due. If that happens, the package may come back to you, requiring it to be reshipped (and delaying delivery time), or the customer may be liable for paying the difference in postage.

### Which is the best way to estimate postage?

Calculating postage by weight is one of the best ways to create an accurate shipping estimate, but weight is just one piece of information that you will need in order to narrow down the potential cost of shipping.

### How to calculate postage rates without a postage scale?

When inputting the weight and dimensions, pay close attention to the units selected. If your postal scale gave the weight in grams, choose metric. If the weight was in pounds and ounces, choose standard/imperial. Likewise, make sure you choose inches or centimeters accordingly.

### What's the weight of a USPS mail piece?

What is the weight of your mail piece? Length plus girth combined cannot exceed 108 inches. (USPS Retail Ground cannot exceed 130 inches.)

### How to calculate the cost of USPS shipping?

Commercial pricing provides shipping discounts of up to 15% off retail shipping and postage prices. You need to apply for this pricing model through USPS. To calculate USPS shipping costs, use this price calculator.