Editorial policy
Health and fitness information should be accurate, sourced and honest about uncertainty. This is how we work.
1. Sources
We base our content on peer-reviewed research (for example in the Journal of the American College of Cardiology, Sports Medicine and Frontiers in Physiology), position stands from professional bodies such as the American College of Sports Medicine, and guidance from public health organisations such as the World Health Organization, the American Heart Association and the U.S. Centers for Disease Control and Prevention. Each guide lists its sources.
2. Calculations
Every figure in the calculator and the guides' tables is computed from the published formulas listed on the methodology page. We do not invent or round favourable numbers.
3. What we will not do
- Give individual medical advice or diagnose conditions.
- Make weight-loss or health promises.
- Recommend maximal exercise testing without appropriate supervision.
- Promote products in exchange for payment.
4. Review and corrections
Guides show their last updated date and are reviewed when guidelines change or readers report problems. Email hello@zone2heartratecalculator.com with corrections; we check reports against the original source and fix confirmed errors promptly.
5. Independence and advertising
The site is published by Autonex Pte Ltd and may display advertising served by Google. Advertisers have no influence over content.