You printed a Mercari label, the package hit the scale at the post office, and suddenly the weight is wrong – either you overpaid for shipping or you’re staring at an adjustment charge for going under. It’s annoying, it eats your profit, and it happens to everyone. Here’s how to fix it and stop it from repeating.
Why the weight comes out wrong
Prepaid labels are priced on the weight and dimensions you entered when you bought them. Guess too low and the carrier catches the real weight and bills the difference. Guess too high and you paid for ounces you didn’t use. Add packaging you forgot to weigh – the box, the poly mailer, the bubble wrap – and small misses add up fast across a busy shop.
Fixing an over or undercharge
- Undercharge: if the carrier adds a postage-due adjustment, Mercari typically deducts the difference from your proceeds. Check the order details and Mercari’s help center for how the adjustment shows up and how to dispute it if the weight is clearly wrong.
- Overcharge: if you bought way more label than you needed, contact Mercari support with the actual weight and receipt – refunds for overpaid postage are handled case by case.
- Going forward, weigh the fully packed parcel on a real scale and round up a touch to leave margin.
Please confirm the current adjustment and refund process in Mercari’s help center, since the details change.
Bottom line
Wrong-weight labels are a slow leak in your profit, not a crisis. Weigh packed, round up, fix the odd adjustment, and clean up your presets in bulk so it stops happening. Small automations, real money saved. Do less, earn more.
New here? Nifty is the crosslister I personally use to list once and sell everywhere. If you decide it is for you, my code ALEXIS44 gets you 15% off: https://nifty.ai/?referral=ALEXIS44