Adding a Delivery Promise: A Playbook | Shipium



Kris Gösser](https://hub.shipium.com/author/kris-gosser/)

Updated June 22, 2026

13 min read

Introduction

While communicating a delivery date after a customer makes an online purchase is a basic ecommerce interaction, starting the estimation process and providing a clear delivery promise before the final buying decision (in real-time) is much more difficult.

This playbook explores how enterprise shippers, ecommerce businesses, and marketing leads can increase cart conversion rates by merchandising delivery dates.

Key highlights:

Providing a promised delivery date can drive purchase decisions

Consumers expect to be told when they will receive the things they buy online. Traditionally, that is managed after an order is processed, with notifications being sent via email during the post-order flow. But increasingly, buyers are making purchase decisions based on knowing an estimated delivery date before they actually buy something.

A study of VML showed that 63% of shoppers agreed with the statement, with a clear and seamless delivery experience being a crucial aspect of their decision to click the buy now button.

Not many stores adhere to this preference. Visit most ecommerce sites and go to the product detail page, and you will see something like “Usually ships within 2 days,” which doesn’t help. All the consumers care about is when they will get the product, but instead, sites give a service level agreement (SLA) for the fulfillment center.

Examples of delivery promises from large ecommerce brands

Large ecommerce businesses — like Walmart, Target, Amazon, Home Depot, and others — have invested in delivery promises, however, and pushed this expectation over the years because they know it matters to customers.

Once Amazon expanded to a marketplace model, they extended estimated delivery dates to sellers who use Fulfillment By Amazon (FBA). Here is an example of a seller who uses FBA which affords them the same customer experience benefit of showing accurate EDDs on the product detail page.

Here we have Helly/Hansen sold on the Amazon marketplace. The default option is via the reseller Backcountry, who does not use FBA, but still gives a delivery date range.

Meanwhile there is another seller, Big Weather Gear, who does use FBA and thus gets a delivery promise.

Implementing estimated delivery dates is a challenge

Any company that presents an estimated delivery time will experience better conversion and loyalty. So why doesn’t every store do it?

The screen real estate for displaying a simple date is small, yet the technical requirements behind the scenes are huge. A real-time, SKU-specific estimation displayed on a screen requires integration with the following systems:

A delivery promise provides a unique advantage in the form of merchandising your supply chain. We often find ecommerce partners actually provide faster speeds than they advertise, missing a major opportunity. Customers who are geographically close to their fulfillment centers will receive the order in two days, even with economy shipping methods.

How to implement reliable delivery dates

When implementing reliable delivery dates, the first thing to know is the destination ZIP. If you have a user account system set up, you can pull the ZIP from the customer profile. If the user isn’t logged in, you could check if a previous order had been made and saved to a cookie, which can pull the ZIP from that previous order.

Lastly, you can assume the ZIP based on checking the user’s IP address, but to ensure accuracy, you may need to request the user enter the destination ZIP on product pages before showing a projected date. The next thing needed is the SKU.

From there, the front end makes a call and sends those two data points to the inventory management system to know how many items of that SKU are left across which FCs.

Delivery date promise: Key plays

When it comes to providing an upfront shipping date to customers, the challenges are multidimensional and get increasingly complex, with more FCs, SKUs, carriers/methods, packaging options, and shipping policies in your system.

Managing trade-offs

In general, it’s best to optimize towards returning the fastest projected delivery date, as that is a more marketable value. Customers who want things fast or by a specific date are actively looking for that when considering a purchase.

Prioritizing real-time results

Delivery dates need to be determined in real-time. The complexity of inputs going into the estimated date is too immense to rely on static values.

Factoring cut-off times

Managing the latest time that orders can be made on a given day is important to improve precision.

Fulfillment metrics you need to track

The key to optimizing your promise is managing and consistently reviewing and drawing insights from detailed shipping analytics. These include:

Make delivery promises more intuitive with Shipium

Adding a delivery promise is a play that Shipium was built to support. We provide an API that customers call, sending us their product and customer information for a given SKU.

We then return an estimated delivery promise with precision. Enterprise shippers confidently display that date in their storefront interfaces, such as product detail pages or cart checkout flows, helping drive purchase decisions.

Frequently asked questions

What is a delivery promise?

A delivery promise is a commitment a retailer or ecommerce business makes to deliver an order within a specific timeframe.

What is the importance of keeping your delivery promises?

Keeping the delivery promises you make at the time of purchase is crucial because it helps:

How accurate are delivery promises?

The delivery promises given to consumers can vary in accuracy depending on multiple factors outside your control, such as carrier performance and weather events.

How can ecommerce companies maintain their promised delivery dates?

Several key strategies can help ecommerce companies ensure they deliver on time, every time: