\ \ 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:** - A delivery promise showing when customers will receive items before purchase significantly increases cart conversion rates. - Major retailers like Amazon, Walmart, and Target have successfully implemented delivery promises as a competitive advantage. - Creating accurate delivery estimates requires real-time integration between inventory, fulfillment, transit systems, and shipping policies. - Shipium’s API allows enterprise shippers to confidently display precise delivery dates on product pages and in checkout flows. ## 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](https://hub.shipium.com/en/blog/estimated-delivery-dates) _before_ they actually buy something. A study of [VML](https://www.vml.com/insight/the-future-shopper-2024-has-landed) 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)](https://hub.shipium.com/content/delivery-service-level-agreements/) for the fulfillment center. ### Examples of delivery promises from large ecommerce brands Large ecommerce businesses — like Walmart, Target, [Amazon](/content/pr/shipium-and-amazon-shipping-partner-to-bring-reliable-ground-shipping-to-merchants/index.html), 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: - Frontend (Store, like [Shopify](https://hub.shipium.com/content/10-shopify-fulfillment-best-practices-for-ecommerce-businesses/) or Magento) - Inventory - Fulfillment - Transit Management System (TMS) / carrier network - Policies 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](https://hub.shipium.com/content/leverage-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](https://hub.shipium.com/content/shipping-analytics/). These include: - **Accuracy:** Log all displayed estimated dates. Connect a displayed date with an order placed, then track when the order was received via carrier APIs. Check if the date delivered matched the estimate, and track a variance either way. Industry best practice is to be over 90% accurate. - **Conversion percentage:** Log if an estimated delivery date was displayed for a given order. It’s easy to do an A/B test to see its effectiveness. Industry reports show conversion should increase between 6%-12%. - **Speed/cost balance:** When determining an EDD, it’s helpful to log all possible dates that were determined for your given policies. ## Make delivery promises more intuitive with Shipium Adding a delivery promise is a play that [Shipium](https://hub.shipium.com/platform) 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](/content/delivery-promise/index.html) 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: - **Build consumer trust**: When your customers receive their packages exactly when promised, it establishes reliability and credibility. - **Reduce customer service workload**: Meeting delivery promises significantly decreases day-to-day order inquiries. - **Protect your brand reputation**: Negative delivery experiences can quickly damage your reputation across review platforms and social media. - **Avoid unnecessary costs**: Missing delivery promises often leads to [expedited shipping](https://hub.shipium.com/en/blog/expedited-shipping). ### 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: - Implement robust inventory management systems that provide real-time visibility. - Partner with reliable shipping carriers and establish clear service level agreements. - Proactively communicate [shipping delays](https://hub.shipium.com/blog/ecommerce-shipping-delays) to maintain customer trust.