How to calculate certified mail postage

To calculate certified mail postage, you'll need to follow these steps:

  1. Determine the weight of your mailpiece: Weigh your mailpiece using a scale to get its exact weight in ounces or grams.
  2. Determine the size of your mailpiece: Measure the length, width, and thickness of your mailpiece to determine its size. You can use a ruler or a measuring tape to do this.
  3. Check the mailpiece's dimensions: Compare your mailpiece's dimensions to the USPS's size standards for certified mail. If your mailpiece is larger than the maximum size allowed, you'll need to use a larger envelope or package.
  4. Calculate the postage: Use the USPS's postage calculator or consult the USPS's website to determine the postage cost for your certified mailpiece. You can also use the following formula:

Postage = (Weight x Rate per Ounce) + (Size-based Surcharge)

Where:

For example, if your mailpiece weighs 2 ounces and is a standard letter size (up to 11.5 inches long, 6.125 inches wide, and 0.25 inches thick), the postage would be:

Postage = (2 oz x $3.80 per oz) + $0.00 (no size-based surcharge) = $7.60

  1. Add the certified mail fee: Certified mail requires an additional fee, which is currently $3.45 for each piece. Add this fee to your calculated postage:

Total Postage = $7.60 + $3.45 = $11.05

  1. Check for any additional fees: Depending on the type of certified mail you're using (e.g., return receipt requested), you may need to pay additional fees.

Certified Mail Postage Rates (as of 2023)

Remember to always check the USPS's website for the most up-to-date postage rates and fees.