About Zone 2 Heart Rate Calculator
Zone 2 Heart Rate Calculator is a free tool and guide for anyone who wants to train at the right aerobic intensity — beginners, returning exercisers and endurance athletes alike.
What we do
- A transparent calculator that compares the three most widely used Zone 2 methods side by side, with every formula published on our methodology page.
- Plain-English guides grounded in published research and guidance from bodies such as the World Health Organization, the American Heart Association and the American College of Sports Medicine.
- Honesty about limits. Heart rate formulas are estimates. We say so, and we show how to check your intensity with the talk test.
Who publishes the site
The site is published by Autonex Pte Ltd, a Singapore company that builds data tools and automation. Our editorial team researches and writes the guides, checks every figure against the sources cited, and updates pages when guidance changes. We are not a medical provider, and nothing on the site replaces advice from a qualified health professional.
Our principles
- Evidence first. Claims are linked to their sources, including studies whose findings are inconvenient for popular fitness trends.
- Safety first. We highlight when to talk to a doctor, and never encourage maximal testing without appropriate supervision.
- Independence. We do not accept payment to recommend products. The site may show advertising; advertisers do not influence content. See our editorial policy.
Contact
hello@zone2heartratecalculator.com — see the contact page.