Enter your data and before/after speed to get an idea of potential revenue change from a performance boost.
(scroll down for case studies)

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*Math based on 2% conversion increase for every 1 second speed decrease.


Use Google Analytics to get your stats.

Use WebPageTest.org to measure speed and performance metrics (optionally for different connection speeds).

Use the Shopify Analyzer if you're looking for ways to make your Shopify site faster.


Faster load speed improves conversions and SEO but there's no exact formula, so based on public case studies we set the algorithm on the Calculator to a 2% increase in conversions for every 1 second of speed change.

The range in these studies was generally 1% - 7% increase in conversions for every 1 second decrease in load speed.

*We make Shopify sites faster because studies show that performance gains improve key metrics. We guarantee a faster site but can't guarantee actual revenue results.

By the way if you have a case study you want to share let us know. It would also be cool to see any that show a decrease, for scientific completeness 🤓

Walmart saw up to a 2% increase in conversions for every 1 second of page speed decreased.

Through A/B testing, Zalando found that a 100ms improvement in load time led to a 0.7% increase in revenue per session.

A 1 second delay in page response can result in a 7% decrease in conversions

In an analysis of 10 billion user visits, Akamai found that a 2 second delay on mobile decreased conversions by 26% and negatively affected session length and bounce rate

Intuit saw a 1% - 3% improvement in conversions for every 1 second of performance gain

Shopzilla increased page views by 25% and conversions by 7% - 12% after decreasing page load by about 6 seconds