Can I calculate postage costs with this?

This tool estimates the weight of your mail. You can use the weight result to calculate postage costs on your postal service website.

Does it work for small packages?

Yes, it works well for small to medium packages, padded envelopes, and regular letters. For very large packages, accuracy may decrease.

How much can I mail with a single first-class stamp?

One US first-class stamp covers a standard letter up to 1 oz (about 28 g), which is roughly four sheets of paper plus the envelope. Go over and you need the 2 oz rate. The chart above shows where common items fall.

Can I weigh multiple items at once?

For best accuracy, photograph individual items. If you need to weigh multiple items, photograph them separately and add the weights together.

Postage Scale Online

Weigh mail and packages before shipping

Estimate the weight of your letters, envelopes, and small packages before heading to the post office. Take a photo and get an instant weight estimate to calculate postage costs accurately.

Photo your package or letter to weigh it

Drag & drop an image, or click to browse

How It Works

Take or Upload a Photo

Snap a picture of the object you want to weigh or upload one from your gallery.

AI Analyzes Weight

Our AI identifies the object and estimates its weight using visual analysis.

Get Instant Results

Receive accurate weight estimation in grams, ounces, or pounds instantly.

Envelopes and a small package on a desk being weighed by phone before shipping

Common Mail Weights and USPS Postage Tiers

US first-class pricing steps up by weight, so a few grams can change your postage. Use this chart to see roughly where your item lands before you buy a stamp.

Mail item	Typical weight	Ships as
Single-page letter + envelope	6 g	First-class (up to 1 oz)
3-4 page letter	15 g	First-class (up to 1 oz)
Greeting card	28 g	First-class (1 oz)
Wedding invitation set	42 g	First-class (2 oz rate)
Small padded mailer	60 g	Large envelope / flat
Paperback book	250 g	Media Mail / package

1 oz = 28.35 g. USPS first-class letters top out at 3.5 oz (~99 g); heavier items move to flat or package rates.

Estimate Postage Weight Before You Ship

Avoid surprises at the post office by estimating the weight of your letters and packages at home. Our AI postage scale analyzes your photo and provides a weight estimate in grams or ounces, so you can calculate shipping costs in advance and apply the correct postage.

Save Time and Money on Shipping

Overpaying for postage is common when you guess the weight of your mail. With our free postage scale, you can get a reliable weight estimate before heading to the post office or scheduling a pickup. This helps you choose the most economical shipping option for your needs.

Works with Letters, Envelopes, and Small Packages

Whether you are mailing a birthday card, sending documents, or shipping a small product to a customer, this tool handles it all. Photograph your item on a flat surface for the best results. For packages, include a side view to help the AI gauge thickness and overall volume.