About
About TDEE Calculator
A calculator that respects you enough to tell you when it might be wrong.
Why this site exists
The TDEE Calculator at tdeecalculator.org has been online since 2014. We rebuilt it in 2026 to fix three things that the rest of the category gets wrong:
- Pretending estimates are exact. Most calculators present a number with quiet authority. Real-world data shows formula estimates miss by > 250 kcal/day for half of users. We say so on the front page and provide a calibration protocol on a dedicated page.
- Vague activity buckets. "Moderate" covers wildly different lifestyles. We built an 8-question quiz that outputs a precise numerical multiplier calibrated to your real life.
- Ignoring women\'s metabolism. No major competitor adjusts for luteal phase, pregnancy, breastfeeding, perimenopause, or PCOS. Ours does, with citations.
How we\'re built
- Server-rendered HTML, no JS framework, no hydration delay
- Calculator math runs in your browser; nothing you type is sent to our servers
- Page weight under 80 KB initial load
- Works offline as a PWA
- No tracking cookies, no ad networks, no third-party scripts
Who maintains the site
The TDEE Calculator Editorial Team reviews all health-related content. Every formula has a primary-source citation (paper, PMID, DOI). Every life-stage adjustment links to the institutional guideline (IOM, WHO, NIH) that supports it.
What we don\'t do
- Personalized nutrition coaching or medical advice (talk to a registered dietitian or your doctor)
- Sell supplements or weight-loss programs
- Display ads from third-party networks
- Collect personal data for marketing
Contact
Corrections, feedback, embed inquiries: /contact/