Overview

Amazon’s On‑Time Delivery (OTD) metric measures the share of units that reach customers by the delivery date shown at checkout. The metric applies to every merchant‑fulfilled order—both standard MFN and Seller‑Fulfilled Prime (SFP)—and a score below the required threshold can jeopardize account health and selling privileges.

Key Points

• Benchmark requirement – 93.5 % — Sellers must keep their OTD rate at or above 93.5 %; dropping to 90 % for a month would trigger a health warning and could lead to enforcement actions.
• All merchant‑fulfilled shipments count — Every unit shipped under MFN or SFP is included in the calculation, while Fulfilled‑by‑Amazon (FBA) orders are excluded because Amazon controls the delivery end‑to‑end.
• Promise extensions are not a safety net — If Amazon adds extra days to the customer‑facing delivery window because of severe weather, the extension only appears to the buyer; the OTD score is still judged against the original promised date you set.
• Unit‑level, not order‑level, measurement — A three‑item order where two items arrive late counts as two missed units, not a single late order, which can quickly erode the overall percentage.
• Channel‑specific reporting — OTD is broken down by fulfillment channel (MFN vs. SFP) at the brand level, allowing sellers to pinpoint whether a particular program is dragging the score down.

How the On‑Time Delivery Metric Works

1. Collect shipment data — Amazon aggregates the total number of units shipped in a reporting period and flags each unit that arrives after the original promised date. Example: In a week you ship 1,200 units; 45 of them are delivered one day late.
2. Calculate the late‑unit ratio — Divide the count of late units by the total units shipped. Using the example, 45 ÷ 1,200 = 0.0375 (3.75 % late).
3. Derive the OTD percentage — Subtract the late‑unit ratio from 1 and multiply by 100. 1 − 0.0375 = 0.9625 → 96.25 % OTD.
4. — The resulting percentage is measured against the 93.5 % minimum.