What we built and why
The top-ranked TDEE and BMR calculators on the internet mostly look and feel like they were built in 2012 — because most of them were. They rank well because they've been around a long time, not because they're particularly good. The results are often presented without context, the formulas aren't cited, and there's no guidance on what to do next.
MyVitaMetrics started with a simple goal: build the calculator site we'd actually want to use. Clean, fast, formula-transparent, and genuinely useful beyond the number itself.
The formulas we use
Formula sources
| Calculator | Formula | Source |
|---|---|---|
| TDEE and BMR | Mifflin-St Jeor equation | Mifflin et al., 1990 |
| Body fat % | US Navy circumference method | Hodgdon & Beckett, 1984 |
| Ideal body weight | Devine, Robinson, Miller, Hamwi | 1964–1983 |
| Macronutrients | AMDR + research-backed protein targets | IOM, Morton et al. 2018 |
| Calorie deficit | 7,700 kcal per kg principle | Hall et al., 2011 |
Our principles
1
Formula transparency
Every calculator shows which formula it uses and links to the source research. You should know what's powering the number you're given.
2
No account, no data
All calculations happen in your browser. Your height, weight, and measurements are never sent to our servers or stored anywhere.
3
Context with every result
A number without context is just a number. Every result comes with an interpretation of what it means for you specifically, and a clear next step.
4
Free, permanently
The calculators are free and will stay free. The site is supported by advertising and affiliate commissions — neither of which influences the content or calculator results.
Get in touch
Spotted a formula error, have a calculator suggestion, or just want to say hello — we'd genuinely like to hear from you.