Late Shipment Rate Calculator

Late shipment rate is the metric that punishes you twice. First, it has its own 4% limit. Second, every late order is a small odds bet on a negative review, and those reviews feed your ODR — the one that actually kills accounts. So a sloppy shipping week doesn't just nudge one number; it quietly loads the gun for another.

You need total orders shipped and how many you confirmed after the expected ship date. Divide late by total. That's your LSR.

What "late" actually means

This trips people up. A shipment is late the instant you confirm it after the expected ship date — not the delivery date, not when the customer complains. Your supplier might hand you the box on time, but if you forget to click confirm until Tuesday, Amazon counts it late. The timestamp is the whole game. I've seen sellers with perfect fulfillment lose points purely because someone hit confirm late.

One bad week tanks it

LSR is calculated over a trailing window, and it doesn't care that "the rest of the month was fine." One supplier meltdown, one snowstorm, one vacation where you didn't process orders — and suddenly 30 late confirmations on 400 orders is 7.5%, double the limit. The fix isn't heroic; it's a buffer. Set your handling time a day longer than you think you need. A slightly looser promise you always hit beats a tight promise you miss.

The feedback connection

Here's the part that matters most: late shipments make customers angry, and angry customers leave negative feedback, and that feedback is a defective order in your ODR. So when you fix late shipping, you're not just protecting a 4% line — you're protecting the 1% line behind it. Run this calculator after any rough week. If you're creeping toward 3%, tighten handling time before the next storm.