Scale to Grams
Check Letter Weight Before Mailing
Nothing is more frustrating than having mail returned for insufficient postage. Our AI letter weighing tool estimates the weight of your envelope from a photo, considering the envelope size, visible thickness, and any bulges that suggest extra contents like photos, cards, or multiple pages. Know before you mail whether you need additional postage.
How Many Pages Fit Under One Stamp
The practical question is usually how many sheets you can send before needing extra postage. Four to five sheets of standard 20 lb paper plus a #10 envelope come in just under the 1 oz limit that a single stamp covers. Slip in a stiff greeting card or a sixth page and you cross into the 2 oz rate, as the chart above lays out.
Understanding Postal Weight Limits
Postal services have specific weight tiers that determine postage costs. In the United States, standard letters up to 1 oz require one stamp, with each additional ounce requiring an extra stamp. Letters exceeding certain weight or thickness thresholds are classified as large envelopes or parcels with different pricing. Our tool helps you navigate these thresholds before heading to the mailbox.
