Weighing parcels for resale: get the label weight right the first time

Two ounces that cost a pound

An example seller weighs a hoodie on a kitchen scale at 15.5 ounces, prints a label for "under a pound," and seals the bag. With the label, mailer and packing slip, the parcel actually weighs 1 pound 1 ounce. A week later, the label platform posts an adjustment. Every one of those extra ounces came from things the seller didn't put on the scale.

This guide covers weighing parcels for resale, using the USPS postage verification page and the USPS Ground Advantage page, checked November 8, 2026. It doesn't recommend a brand of scale, and the price tiers mentioned are USPS's published rules, not current rates.

Why weight has to be exact

USPS says it uses automated package verification on Click-N-Ship and PC Postage labels, including labels bought through eBay and other platforms it names, and that incorrect weight is one of the most common causes of postage differences. Adjustments are made through your label platform.

USPS also rounds weight up:

That last tier is why the hoodie matters. At 15.5 ounces, the parcel would fall in the top ounce tier. At 1 pound 1 ounce, it pays the 2-pound price.

Step 1: Choose a scale that fits what you ship

Look for a scale that reads in ounces and tenths of an ounce, has a capacity above your heaviest typical parcel, and has a platform large enough that a box doesn't hide the display. A tare button, which zeroes the scale with something on it, is useful. A separate small scale for envelopes and a larger one for boxes suits sellers with a wide range of items.

Step 2: Check it before a packing session

Place an object with a known weight on the scale, such as a sealed item labeled with its net weight or a set of calibration weights if you have them. If the reading drifts, replace the batteries and try again. Put the scale on a hard, level surface, not on carpet or a stack of boxes.

Step 3: Weigh the finished parcel

Weigh the parcel after it's fully packed and sealed, with everything that ships:

• The item.
• Padding and void fill.
• The box or mailer.
• The packing slip and any inserts.
• Tape.

If you print the label before sealing, place the label and any label pouch on the scale with the parcel too. A few sheets of paper are small, but for parcels near a tier edge they decide the price.

Step 4: Read the display correctly

Some scales show pounds and decimal pounds; others show pounds and ounces. 1.1 lb isn't 1 pound 1 ounce; it's about 1 pound 1.6 ounces. Set the scale to pounds and ounces if your label tool asks for those units, and write the reading down exactly as the tool wants it.

Worked example: rounding up at tier edges

These are chosen example parcels weighed packed and sealed.

The hoodie and the jeans pay the same pound step even though one weighs 13 ounces more. For items near an edge, a lighter mailer can sometimes move the parcel into a lower tier; padding should never be cut below what protects the item.

Step 5: Add dimensions too

Weight is half of the label. The USPS verification page says a dimension-noncompliance fee applies on Click-N-Ship and PC Postage labels when dimensions are omitted or inaccurate and dimensional weight should have applied. Measure boxes at the same station where you weigh them. The dimensional weight guide has the calculation.

Step 6: Record the packed weight with the item

Write the packed weight and box size in your inventory record. When you list a similar item, you'll know the shipping cost before you price it, and when you relist, you won't need to repack to check. The inventory spreadsheet guide shows a column for it.

Estimate first, weigh last: For pricing a listing, an estimated packed weight is fine. For buying the label, only a real reading of the sealed parcel counts.

Where to put the scale

Keep the scale at the packing station, at a height where you can read it without bending. A station with tape, mailers, a tape measure and a scale in one place makes it easy to weigh every parcel instead of guessing. The standard operating procedures guide covers turning that station into a routine anyone can follow.

Common mistakes

• Weighing the item and guessing the packaging.
• Using a bathroom scale for parcels under a few pounds.
• Confusing decimal pounds with ounces.
• Not checking the scale after changing batteries.
• Forgetting dimensions on a large box.

Weigh it like USPS will

USPS weighs the sealed parcel and rounds up, so you should too. Weigh everything that ships, read the units carefully, and record the packed weight so the next listing starts from a real number.