Scale to GramsHow to Weigh a Letter Without a Scale
Quick Answer
No scale? The fastest way is to count sheets — 4-5 sheets of 20-lb paper plus a #10 envelope is right at 1 oz (the limit for one Forever stamp). For more accuracy, photograph the letter with a credit card visible and use our AI Letter Weight Tool.
Weigh Your Letter From a Photo5 sheets + envelope
~1 oz
one stamp limit
A kitchen scale
$8-15
cheap solution
Free option
AI photo
no scale needed
Method 1: Count Sheets of Paper
The simplest method when your letter is just paper. Standard 20-lb printer paper (the most common kind) gives you a reliable count.
| Sheets of paper | Total weight | Stamps needed |
|---|---|---|
| 1-2 sheets | ~0.5 oz / 14g | 1 Forever stamp |
| 3 sheets | ~0.7 oz / 20g | 1 Forever stamp |
| 4 sheets | ~0.9 oz / 25g | 1 Forever stamp |
| 5 sheets ⚠ | ~1.0 oz / 28g | Borderline — use 1 stamp |
| 6 sheets | ~1.2 oz / 33g | 2 stamps |
| 7-9 sheets | ~1.5-2.0 oz / 42-56g | 2 stamps |
| 10+ sheets | 2.0+ oz / 56g+ | 3 stamps or weigh |
Method 2: Use a Photo (Free)
Place your sealed letter on a flat surface next to a credit card or US dollar bill for scale. Take a photo from directly above. Upload to our Letter Weight Tool. The AI estimates the weight based on visible thickness, paper type, and the reference object. Works for letters with cards, photos, or non-paper contents that the sheet count method misses.
Method 3: Compare to a Reference
If you have any household object whose weight you know, compare it to your letter by hand. Common 1 oz reference points:
| Object | Weight |
|---|---|
| Standard #2 pencil | ~0.25 oz / 7g |
| Single AA battery | ~0.85 oz / 24g |
| Slice of bread | ~1 oz / 28g |
| Single cracker | ~0.1 oz / 3g |
| Standard playing card | ~0.06 oz / 1.7g |
| Compact disc with case | ~3.5 oz / 100g |
| Single AAA battery | ~0.4 oz / 11g |
| Standard ballpoint pen | ~0.4 oz / 11g |
Method 4: Use a Kitchen Scale
A digital kitchen scale ($8-15 at any grocery store) handles letter mailing forever. Set it to ounces, place the sealed letter on top, read the number. Most kitchen scales weigh in 0.1 oz increments, accurate enough for postage decisions. Bathroom scales are too coarse — letters weigh too little to register.
Method 5: When in Doubt, Add a Stamp
If you cannot weigh and cannot photograph, the safest move is to use 2 Forever stamps for any letter that contains more than 4 sheets, has a card or photo inside, has a thick envelope, or has any non-paper item. The "extra" stamp costs $0.78. A returned letter costs you a delay, a USPS fee, and embarrassment if it had a check or invitation in it.
Quick Decision Guide
Three rules of thumb that cover 95% of mailing decisions:
| Letter contents | Likely weight | Stamps to use |
|---|---|---|
| 1-4 sheets in plain envelope | Under 1 oz | 1 Forever |
| 5+ sheets, or any greeting card | 1-2 oz | 2 Forever (safe) |
| Photos, coins, or bulky items | 2-3 oz | Weigh first |
Frequently Asked Questions
How can I weigh a letter without a scale?+
Count sheets of paper (4-5 = 1 oz with #10 envelope), compare its weight to a known object like an AA battery (~1 oz), or photograph it with a credit card for scale and use our AI Letter Weight Tool.
Can I use a kitchen scale for mail?+
Yes, this is the most reliable home option. A $10 digital kitchen scale weighs in 0.1 oz increments, more than precise enough for postage. Bathroom scales are too coarse to register letter-size weights.
How many sheets of paper equal 1 ounce?+
6-7 sheets of standard 20-lb printer paper weigh exactly 1 oz on their own. Inside a #10 envelope (which weighs 0.24 oz), about 4-5 sheets bring you to the 1 oz total limit.
Will USPS weigh my letter for me?+
Yes. Bring your unsealed or sealed letter to any USPS counter and the clerk will weigh it for free and tell you the exact postage. They will also sell you the right stamps on the spot.
How accurate is photo-based letter weighing?+
Within 0.1-0.2 oz when the photo is clear and includes a reference object like a credit card. That is precise enough to know if you need 1 or 2 Forever stamps.
Is it cheaper to overpay or underpay postage?+
Always overpay. A wasted $0.78 stamp is cheaper than a returned letter (delay, USPS handling fee, and any consequences of the contents not arriving on time).
How heavy is a typical wedding invitation?+
Wedding invitations usually weigh 2-3 oz when assembled (heavy cardstock + envelope + RSVP card + envelope + tissue paper). They almost always need 2-3 Forever stamps. Always weigh wedding invitations or use the AI tool — getting them returned is a major problem.
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