The importance of fast, reliable ecommerce fulfillment for customers cannot be overstated. The moment an order is placed on any online sales channel, the business races to pick, pack, ship, and deliver that order. Meanwhile, shoppers await their products with the expectation that they’ll arrive on time and in perfect condition.
If your ecommerce business fails to meet these expectations, you run the risk of losing customer trust and loyalty. To drive customer satisfaction and revenue growth, you’ve got to get your order fulfillment right.
Some ecommerce businesses handle their order fulfillment in-house, while others opt to outsource the picking, packing, and shipping of their orders to third-party logistics (3PL) providers, like Amazon Supply Chain Services (ASCS), a complete end-to-end logistics solution that offers businesses access to Amazon’s global logistics network, cutting-edge technology, and a suite of supply chain capabilities from ground freight to warehousing, parcel shipping, and more.
Regardless of whether you engage a 3PL or not, you need to ensure that your fulfillment operations run as smoothly and successfully as possible. But how can you monitor and measure the effectiveness of your order fulfillment operations? Many companies track key performance indicators (KPIs) to gauge their performance in order fulfillment (and other business areas) over time.
In this guide, we will discuss the five most important ecommerce fulfillment KPIs that your business should be tracking, and explain how a 3PL can help you improve in those areas.
The first—and arguably the most important—ecommerce fulfillment KPI that you need to be monitoring is your on-time delivery rate. Your on-time delivery rate measures your performance in meeting your delivery promises to customers, which can have a huge impact on customer satisfaction and loyalty.
To calculate an on-time delivery rate, take the number of orders that are delivered on time over a certain period, divide it by the total number of orders over that same period, and multiply that number by 100. This will give you the percentage of your orders that arrive at your customers’ doorsteps on time.
By working with a best-in-class 3PL, you can ensure your on-time delivery rate hovers as close to 100% as possible. Amazon’s Multichannel Fulfillment (MCF) service, part of the fulfillment arm of ASCS, for example, has an average on-time delivery rate of 96.4% for all MCF orders worldwide.1
There are a few common root causes that can lead to subpar on-time delivery rates.
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Inefficient fulfillment operations
Delays or errors in your in-house or 3PL’s pick, pack, and ship processes can lead to orders not being sent out on time.
One of the chief drivers of these delays and errors is a lack of automation in your operations. A 3PL service, by utilizing state-of-the-art integrations and cutting-edge warehouse technologies, can help eliminate these operational issues and optimize your order fulfillment from click to delivery.
MCF, for example, offers partners more than 100 integrations and has access to ASCS’ advanced and continuously evolving technology. -
Substandard carrier performance
Issues with carriers—who handle the shipping of orders to customers—not meeting their service-level agreements (SLAs) and delivering on time.
Although most 3PLs rely on external carriers, some 3PLs—like ASCS—are carriers themselves, giving them the capability to control shipping operations and ensure SLAs are met. This benefits ecommerce businesses: by engaging a 3PL that is also a carrier, ecommerce businesses reduce the number of partners they engage with, saving time and streamlining their own operations.
By engaging the right 3PL provider for your fulfillment services, you can pinpoint and resolve the root causes of lackluster on-time delivery rates and ensure you are consistently able to meet delivery promises to shoppers.
By engaging the right 3PL provider for your fulfillment services, you can pinpoint and resolve the root causes of lackluster on-time delivery rates and ensure you are consistently able to meet delivery promises to shoppers.
1Based on all orders placed and delivered between October 2024 and September 2025, and measuring the percentage of orders that were delivered on or before the estimated delivery date generated upon order confirmation.
The second ecommerce fulfillment KPI that you should be monitoring is total order cycle time.
This KPI can be calculated by taking the total number of days that elapse between customers placing their orders and receiving them, and dividing that figure by the total number of orders shipped over that time period. Total order cycle time measures the average amount of time from click to delivery, and is a good indicator of the efficiency of your order fulfillment operations.
The faster your total order cycle time is, the better. If your order cycle time is causing delays in getting your orders out from the warehouse door and to customers’ doorsteps, it can harm your topline growth. In fact, abandon their online carts because the delivery times displayed at checkout are too slow.
Today’s shoppers increasingly expect deliveries within two business days—and leading 3PL services, like MCF, can consistently meet these expectations and help ensure your order fulfillment operations run with the highest levels of efficiency. MCF leverages Amazon’s world-class fulfillment network, which has an average “click-to-door speed” of 1.9 days—over 50% faster than other retailers.
The third ecommerce fulfillment metric that you should keep an eye on is your order picking accuracy rate. This measures the percentage of ecommerce fulfillment orders that contain the correct items that shoppers ordered.
When picking errors occur in the warehouse, and the wrong items or quantities of items are shipped out, this can cause significant damage to customer satisfaction and trust. It can also lead to increased operating costs for inventory and returns processing.
To calculate your order picking accuracy rate, take the total number of orders that are verified as being picked accurately before shipment over a certain time period, divide that by the total number of orders picked during that period, and then multiply that number by 100.
You should aim to have your order picking accuracy rate as close to 100% as possible. Leading ecommerce companies and 3PL providers often register order picking accuracy rates of 98% and above. If your order picking accuracy rate is lower than that, you should investigate and identify the errors’ causes and potentially consider engaging a new 3PL provider to help you boost your order picking accuracy.
By employing warehouse management systems and automation technologies, a 3PL can help you ensure that the right products are always picked, packed, and shipped to customers. As part of the ASCS network, MCF has access to Amazon’s advanced packing and picking technology, including a fleet of more than 1 million robots that work to ensure the speed and accuracy of warehouse processes.
Another ecommerce KPI that you should be closely tracking is inventory accuracy rate. It measures the difference between the actual amount of stock that you have on-hand in the warehouse and the amount of stock that is recorded in your back-end systems.
To calculate your inventory accuracy rate, count the number of units you have physically in the warehouse, divide that by the number of units you have recorded in your back-end systems, and multiply that by 100. You should aim for a 100% inventory accuracy rate. Anything less could indicate that you have inventory management issues, potentially leading to stockouts, eroding customer trust, or excess stock, which can tie up working capital.
A 3PL can help you improve your inventory accuracy rate and attain an accurate, real-time view of your inventory levels by:
- Instituting inventory management best practices, such as cycle counts and rolling audits, to make sure your physical inventory levels tally with what’s showing in your back-end systems.
- Utilizing the latest warehouse hardware (like scanners) to track and trace your products from the moment they’re inbounded at the 3PL’s warehouse, and software integrations to seamlessly connect the 3PL’s systems with your order and inventory management systems.
- Using advanced inventory forecasting software to accurately predict stock levels during peak season. ASCS’ advanced analytics and sophisticated prediction models ensures your stock is accurate and reduces the possibility of stockouts or overstocking.
Working with a 3PL can help you to optimize your inventory management and ensure that your inventory accuracy rate hovers as close to 100% as possible.
Cost per order fulfillment is a financial metric that reveals how much you’re really paying to store, pick, pack, and ship orders to customers. If you want to maintain a healthy bottom line over time, you have to keep your cost per order down.
Your average cost per order can be determined by adding together all the costs you incur that are associated with fulfilling orders (including inbounding, storage, picking, packing, and shipping costs) over a certain period of time and dividing that number by the total number of orders during that timeframe.
It’s pivotal that you continuously monitor your average cost per order from week to week and strive to keep this figure as low as possible. Even small reductions in your cost per order can have an impact on the long-term profitability of your business.
A 3PL provider can help you reduce your average cost per order by:
- Conducting ongoing, in-depth analysis of your average cost per order and identifying the underlying drivers of higher costs.
- Optimizing your order fulfillment operations from click to delivery, to consistently keep your average cost per order down and, at the same time, keep your delivery promises to customers.
The success of your ecommerce business hinges on your ability to deliver orders as rapidly and reliably as possible to shoppers’ doorsteps. By continuously monitoring and assessing your order fulfillment performance, you can meet customer expectations for fast, reliable delivery.
Be sure to track the five critical ecommerce fulfillment KPIs that we outlined in this article as a baseline; think of them as a starting point. Ultimately, the selection of ecommerce fulfillment KPIs you decide to focus on should reflect your business priorities. If you are working with a 3PL or evaluating potential 3PL providers,you can discuss with them how they can help you improve in these areas.
If you engage the right 3PL, they can help you to elevate your performance against your ecommerce fulfillment KPIs and accelerate your business growth.
