Website Speed to Revenue Loss Calculator

Calculate how much revenue your slow website is losing you every month. Free page speed and conversion rate calculator, based on real industry research for you.

Anushka Gupta

8/31/20262 min read

Website Speed to Revenue Loss Calculator - Free Tool From BrightNest Studio

Ever wondered how much your slow website is really costing you?

Our free website speed revenue loss calculator shows you exactly that. Just enter your monthly traffic, average sale value, and current page load time, and this site speed calculator instantly estimates your lost revenue from slow performance - comparing your current conversion rate against what you'd earn at Google's "Good" Core Web Vitals speed threshold.

Whether you're checking your page load time, working out your website ROI, or trying to understand the real cost of a slow website, this free conversion rate calculator gives you a clear, instant answer - No sign-up, no guesswork.

How to use it:

Choose your currency and enter your monthly visitors and average sale value
Drag the slider to your current mobile load time (or test it free on Google PageSpeed Insights first)
Get your instant monthly and annual revenue loss estimate, plus a side-by-side comparison

Frequently Asked Questions

Is this website speed revenue loss calculator free to use?
Yes. No sign-up, no email, and no cost - enter your numbers and get an instant result.

How does the calculator estimate my revenue loss?
It compares your estimated conversion rate at your current load time against your estimated conversion rate at a 2.0-second load time - the "Good" threshold Google uses for Core Web Vitals. The conversion curve is based on the widely-cited Portent site speed study, which found conversion rates drop sharply as load time increases.

How accurate is this figure?
It's a directional estimate, not an audit. It's built on published industry averages, so your actual numbers may vary depending on your industry, traffic quality, and how your site is currently converting. If you know your real conversion rate, you can enter it directly for a more accurate result.

What counts as a "slow" website?
Google considers a mobile load time under 2.0 seconds "Good." Between 2.0 and 4.0 seconds is workable but leaking conversions. Above 4 seconds, most businesses are losing a significant share of potential revenue to speed alone.

Does this work for businesses outside the UK?
Yes. Select your currency at the start - the calculator works for any country, since it's based on your own traffic and sale value, not local benchmarks.

What should I do if my number is high?
Start with the biggest wins first - image compression, removing unnecessary scripts, and checking your mobile experience specifically. If you'd like an expert to find exactly what's slowing your site down, BrightNest Studio offers a free speed audit.