Dr. Paul Borosky, DBA, MBA
Business Consultant · Operations Glossary
How Do You Calculate On-Time Delivery Rate?
Late deliveries stick in a customer’s memory long after the order arrives. On-time delivery rate shows how often you keep the promise date you gave. This guide gives the formula, explains which orders belong in the count, including the ones never delivered, and shows how to set a fair target. It comes from business consultant Dr. Paul Borosky, DBA, MBA.
Questions? Call or text (321) 948-9588. Dr. Paul answers personally.
Last Updated: 11/07/2026 · Written by Dr. Paul Borosky, DBA, MBA
The Short Answer
What Is On-Time Delivery Rate?
How to calculate it: list every order due in the period with its original promise date, mark each one on time, late, or still open, divide the on-time orders by all orders due, and multiply by 100. Record the reason for every late order.
Are You Keeping Your Delivery Promises?
In Plain English
How Many Promises You Kept
On-time delivery rate answers one question: out of every promise you made, how many did you keep?
Customers remember the one late order, not the nine on-time ones. You cannot fix lateness you have not counted, and most owners overestimate how often they are on time.
A Real-World Example
The Furniture Delivery Company With Late Fridays
A furniture delivery company in Detroit, Michigan had 200 orders due in March. 172 were delivered on or before the promised date. 22 were late, and 6 are still undelivered. The on-time rate is 172 ÷ 200, or 86 percent.
Most of the late runs are on the far side of town on Fridays, so the owner moves those stops to Thursday. Every courier and delivery business can find its weak spot the same way: track the reason, not just the result.
From Dr. Paul’s Fabled Forest
Dumpster Dani and the Willow Grove Run
Doctor Owl was riding the forest trolley when Dani’s box truck roared past, horn blaring.
“Load it up, it’s as good as there!” Dani shouted out the window.
Later that day, at the trolley stop, Dani swore her deliveries for Dani on the Run were basically always on time.
“Basically?” Doctor Owl asked. He handed her a scroll. “For one week, mark each delivery. On time, or late.”
At the end of the week, Dani brought the scroll back. About four in five deliveries were on time. And every single late one was a trip past the Willow Grove, where the road washed out whenever it rained.
Dani mapped a new route around the grove. The next week’s scroll had far fewer late marks.
From Book 3 of Dr. Paul’s Fabled Forest Business School Series, where every business lesson starts with a story.
Dr. Paul’s Insight
Dr. Paul has owners measure promises kept before they promise faster service.
Put It to Work
On-Time Delivery Rate, With a Weekly Tracker
The denominator is every order due in the period, including late orders not yet delivered. For each order, record the order ID, the original promised date, the actual delivery date, and the reason if late.
The formula: on-time rate = orders due and delivered on time ÷ all orders due × 100.
Weekly tracker (March, illustrative):
| Week | Orders due | On time | Late or open | Rate |
|---|---|---|---|---|
| Week 1 | 48 | 40 | 8 | 83 percent |
| Week 2 | 52 | 46 | 6 | 88 percent |
| Week 3 | 50 | 43 | 7 | 86 percent |
| Week 4 | 50 | 43 | 7 | 86 percent |
| March | 200 | 172 | 28 (22 late, 6 open) | 86 percent |
Rule: never move the promised date after the fact.
Watch Out
Pitfalls When Measuring On-Time Delivery
Orders that never arrived are the latest of all. Count them.
If the date moves, the number stops meaning anything.
Without the reason, you cannot fix the cause.
A promise the operation cannot keep is late before it starts.
Why It Matters
Benefits of Tracking On-Time Delivery
- Fewer complaints
- More repeat customers
- Better scheduling decisions
- A delivery claim you can back up
In Your Business Plan
How On-Time Delivery Rate Shows Up in a Business Plan
Lenders and big customers both ask how reliable you are. A measured on-time rate, with a plan to improve it, is a better answer than a promise.
Sample plan excerpt: Operations, Service Metrics
“On-time delivery is measured against every order due, using the original promised date. In March, 172 of 200 orders due (86 percent) were delivered on time. The plan targets 95 percent by Month 4 by rerouting Friday stops and adding a confirmation call the day before.”
FAQ
Questions Owners Ask About On-Time Delivery
What is a good on-time delivery rate?
How do you improve on-time delivery?
Should on-time delivery include partial orders?
More From the Series
Keep Building Your Business
Every book in Dr. Paul’s Fabled Forest Business School Series teaches one subject through short stories, real terms, and one-page worksheets.
Dr. Paul Borosky, DBA, MBA
Dr. Paul is a business consultant and author with 14+ years of experience and 1,000+ written business plans. He works with owner-run small businesses on plans, financial projections, and the systems that let a business run without the owner doing everything. This page is part of the glossary for Operations for Small Businesses, Book 3 of Dr. Paul’s Fabled Forest Business School Series.
This page is for general educational purposes only. It is not legal, safety, accounting, or other professional advice. For decisions about your own business, consult a qualified professional.