Free, and how it stays free

How the site is funded

Running a website costs a little money and a lot of evenings. To cover that, Atrical may use:

• Donations: entirely optional, for anyone who finds the tools useful. You can buy me a coffee.
• Affiliate links: some product suggestions (for example energy gels or drink mix) may link to shops that pay Atrical a small commission if you buy something. The price you pay is the same.
• Advertising may be added later. If it is, it will be clearly separated from the tools.

What we promise

• Products never change the numbers. Pacing, fuelling and every other result is calculated first; product suggestions come after and never influence it.
• Affiliate links are always labelled as affiliate links, right where they appear.
• No sign-up, no paywall, no premium version of the calculators.

Your data

Atrical remembers your last plan in your own browser so it's there next time; you can clear it with "Start over". Share links carry your plan inside the link itself, with the course's elevation profile but no GPS coordinates. Visits are counted without cookies. The privacy page has the details.

The small print

Results are estimates based on published research, standard physics and the numbers you enter. They're not coaching, medical or nutritional advice, and they don't replace a professional who knows you. See the methodology for every formula and source, and the about page for who's behind Atrical.