Ecommerce Statistics for 2027: US and UK Online Sales, Speed and Ad Spend

Roughly one dollar in every six spent in American retail now goes through a checkout page. In Great Britain it's closer to three pounds in every ten. Those two numbers, both from official statistics offices, say more about the state of online selling than most of the forecasts you'll find on ecommerce statistics pages, because they're measured rather than predicted.

They also hide a more practical story. Growth is still strong, so competition for each shopper keeps rising. Retailers are now selling advertising space on their own sites, which changes where brands spend. And the oldest finding in ecommerce still holds: faster pages sell more. This page brings together the official figures for the U.S. and UK, plus the advertising and speed numbers that affect every store owner's results, and explains what to do with them.

Ecommerce statistics at a glance

How big is US ecommerce?

U.S. online retail sales came to $340.2 billion in the Census Bureau's latest quarterly estimate, seasonally adjusted. That's 17.1% of all retail sales, 3.8% above the previous quarter and 12.2% above the same quarter a year earlier, while total retail for the quarter came to $1,986.5 billion.

You'll want to know how to read the Census Bureau's quarterly retail e-commerce report, since it's the official measure. The headline share is seasonally adjusted, so holiday peaks are smoothed out and you can compare one quarter fairly with another. The Bureau also revises earlier quarters when more data arrives, which means a past quarter's figure can shift a little in later releases.

Growth of 12% a year on a base this size means every online seller faces more competition: more stores, more ads and more marketplaces going after the same shoppers. For a small store that usually means organic search and repeat customers matter more, since paid traffic keeps costing more.

How big is UK ecommerce?

As a share of retail it's much bigger than in the U.S.: the Office for National Statistics put online shopping at 28.8% of retail sales in Great Britain in the most recent monthly release. That's down slightly from 28.9% the month before. British shoppers buy online far more often than Americans do, but each country defines retail in its own way.

The ONS publishes this figure every month in its retail sales bulletin. Month-to-month moves like 28.9% to 28.8% are small and often just noise. The useful comparison is the same month a year earlier, or the trend across several months.

Be careful comparing the U.S. and UK shares directly. They're measured by different agencies with different definitions of retail, and the two countries have different store networks, delivery distances and habits. Both figures are official and both are useful. Compare each one with its own history.

Where does ecommerce ad money go?

More and more of it goes to retailers themselves. IAB's full-year 2024 report puts U.S. retail media, meaning ads that retailers sell inside their own websites and apps, at $53.7 billion, up 23%, and making up 20.8% of internet ad revenue overall. Search was still the biggest format, at $102.9 billion.

IAB's internet advertising revenue report has the breakdown. Retail media grew faster than search and display, because brands can reach shoppers just as they're browsing a product category, and they can use the retailer's own purchase data to do it.

If you sell on big marketplaces, retail media is now part of what it costs to be seen there. If you sell from your own store, it's a reminder that the largest retailers are also among the largest sellers of advertising, and that your customer list and organic traffic are assets they can't bill you for. We cover the full channel split in our digital advertising statistics.

Does site speed still affect sales?

Yes, it does. A Google-commissioned study covering 37 brands and more than 30 million sessions found that a mobile site 0.1 seconds faster raised retail conversion rates by 8.4% and made shoppers spend 9.2% more. Separately, Vodafone tested a 31% improvement in loading time for its main content and saw 8% more sales.

The Milliseconds Make Millions study was commissioned by Google and carried out by Deloitte and 55 across 37 European and American brands. The Vodafone case study is a cleaner A/B test: two versions of a landing page looked and worked the same, but the faster one had a 31% better Largest Contentful Paint and produced 8% more sales, an 11% better cart-to-visit rate and a 15% better lead-to-visit rate.

Yet only 48% of mobile websites pass all three Core Web Vitals, according to the 2025 Web Almanac. For most stores, speed is still the cheapest conversion gain available. More in our website speed statistics.

What slows most online stores down?

Speed reports for online stores tend to flag the same few problems, and most of them are fixable without a rebuild:

• Oversized product and banner images. On many stores the biggest single delay is a homepage slider loading five full-size photos.
• Too many apps and scripts. Review widgets, chat, pop-ups, upsell tools and a handful of tracking tags all fight to load before anything else.
• Heavy themes. Many themes load features you don't use on every page.
• Slow category pages. Filters and long product grids that load everything at once.
• Layout jumps. When images and price blocks have no set size, the page jumps around while it loads, and that's annoying when a shopper is about to tap a button.

Test a product page, a category page and the homepage with our free website analysis, and fix the template instead of single pages, because one slow template slows every product.

A product page checklist

Speed, search and conversion all come together on product pages. Before you spend more on ads, look over your top-selling product pages and see whether each one handles these points well:

1. Loads its main image fast on a phone. Compressed, sized correctly, and placed where a slider won't hide them.
2. Answers the buying questions in the first screen. Returns, delivery time, availability and price, all visible without scrolling.
3. Uses a unique, plain-language description. Not the manufacturer's text copied from fifty other stores.
4. Shows real photos from several angles. Add something that shows scale, so shoppers can tell how big the item really is.
5. Shows genuine reviews. Use only genuine ones, never invented or edited, because the FTC's fake review rule covers store reviews as well.
6. Keeps the layout steady while it loads. Images appearing shouldn't make the "add to basket" button jump.
7. Has a clear title and URL. Product name and key attribute, not internal codes.
8. Links to related products and the category. This guides shoppers and also helps search engines make sense of your range.

Start with your ten best sellers, since they usually bring in most of your revenue and fixes there pay back fastest.

Your own store or a marketplace?

Most small sellers end up using both, and the official numbers show why. Marketplaces put you in front of shoppers you couldn't reach alone, and brands paid retailers $53.7 billion for retail media in 2024, which shows what that visibility costs. With your own store you keep the margin and the data, and you own the customer relationship, though you have to find the traffic yourself.

A sensible pattern is to let a marketplace handle discovery and save repeat orders for your own store. Packaging inserts and follow-up emails can invite marketplace buyers to order direct next time, as long as the marketplace's rules allow it.

How to read the official numbers like an analyst

Three habits will keep you from misreading ecommerce statistics, ours included.

Look at the same period last year. Online sales follow the seasons, so a strong final quarter doesn't tell you much by itself. Set it against the final quarter of the year before.

Check whether a figure is seasonally adjusted. Adjustment is applied to the Census headline share, which lets you compare quarters fairly, whereas unadjusted figures swing a lot more around the holidays.

Watch for revisions. Statistics offices go back and revise earlier periods when more data arrives, so if you're following a trend, take every figure from the latest release instead of mixing old and new ones.

Your own analytics call for the same habits. Check what every number actually measures, compare like with like, and treat with suspicion any month that seems unusually good or unusually bad. Our post on why dashboard numbers change shows how to do this in Google Analytics.

Figures you'll see elsewhere that we left out

You'll see ecommerce statistics pages packed with worldwide forecasts in the trillions of dollars, guesses at how many people shop online around the globe, and survey numbers on cart abandonment or free shipping. Most of those are projections or vendor estimates, and the totals differ a lot from one source to the next. We stuck to official, measured figures, so you can link to them when you quote them and be sure what they mean.

What store owners should do with these numbers

1. Test your product pages on a phone, on mobile data. Test away from office Wi-Fi, and run our free analysis to see your Core Web Vitals.
2. Treat organic search as a sales channel, not a hope. Category and product pages deserve as much attention as your ads, and our ecommerce SEO service begins with how categories are structured.
3. Get product data right everywhere you sell. Tidy titles, attributes and images matter for your site as much as for each marketplace; see our product listing service.
4. Build your own audience. You don't pay again for each visit from an email subscriber or a repeat customer.
5. Track revenue by channel in one place. With a business analytics dashboard you can see which channel really pays instead of guessing.

Sources and method

Each figure was checked against its source: the quarterly e-commerce report from the U.S. Census Bureau, the retail sales bulletin from the UK Office for National Statistics, IAB's report on internet advertising revenue for full year 2024, the HTTP Archive Web Almanac 2025 and Google's web.dev case studies. Where we say "latest", we mean the most recent release when we wrote this, and both statistics offices update regularly.