Privacy Policy
The short version: everything you type into a calculator stays in your browser. Here is the full picture, including how advertising works.
What the calculators do with your input
Nothing you enter into a calculator (pace, finish time, distance, predictions, splits or unit conversions) is uploaded or stored anywhere. Every calculation runs as JavaScript in your own browser tab, and those numbers never leave that tab.
Cookies and advertising
PaceLab may show advertising from third-party ad networks (such as Google AdSense or Ezoic) to help keep the calculators free. When ads are running, those networks and their partners can set cookies or use similar technology in your browser to serve and measure ads, including showing ads based on your interests. Visitors in the EEA and UK are shown a consent prompt and can accept or decline this before any personalized ad loads. You can review or clear these cookies from your browser settings at any time.
Analytics
The site may use analytics tools to understand aggregate traffic, such as which pages are popular and how the site is performing, which can also set cookies. Analytics data is used to improve the site and is not used to identify you personally.
Hosting
The site is served as static pages by Vercel, our hosting provider. Like any web host, Vercel processes standard technical request data (such as your IP address and browser user agent) to deliver the pages and keep the service secure.
Contact form
If you use the contact form, the name, email address and message you submit are sent so we can read and reply to it. That information is used only to respond to your message.
Changes and contact
This page is updated whenever the way the site works changes, for example when advertising or analytics are turned on. Questions about this policy? Use the contact form.
Last updated: July 2026.