Cunningham RMR Calculator (Athletes)
The 500 + 22 × FFM equation sports dietitians prefer for trained athletes with measured body composition.
Cunningham re-analysed the Harris–Benedict dataset and found fat-free mass explained almost all the variance — his equation slightly out-performs Katch–McArdle in lean, trained athletes, which is why sports-nutrition position stands cite it. Defaults model a 72 kg endurance athlete at 12% fat.
Formula
For general information only — not medical or training advice. Estimates vary between individuals; consult a qualified professional before changing your exercise or nutrition routine.
The 500 + 22 × FFM equation sports dietitians prefer for trained athletes with measured body composition. The Cunningham RMR Calculator (Athletes) is a free, private cunningham equation tool — every result computes instantly in your browser with no sign-up and no data upload.
About Cunningham RMR Calculator (Athletes)
Cunningham re-analysed the Harris–Benedict dataset and found fat-free mass explained almost all the variance — his equation slightly out-performs Katch–McArdle in lean, trained athletes, which is why sports-nutrition position stands cite it. It applies RMR = 500 + 22 × FFM(kg). Use the Cunningham RMR Calculator (Athletes) to get an instant, clearly-explained result with the working shown step by step — free, private and with the source method cited.
How to use Cunningham RMR Calculator (Athletes)
- 1Enter your details in the Cunningham RMR Calculator (Athletes) input fields above.
- 2The result updates instantly with the working and reference bands shown.
- 3Adjust any value to explore how it changes the outcome — it's free and unlimited.
Why use Cunningham RMR Calculator (Athletes)?
- ✓Instant cunningham equation result that recomputes as you type — no waiting, no page reloads
- ✓100% client-side: your health data never leaves your browser
- ✓Shows the actual formula and your numbers substituted in, so you can see exactly how the result is reached
- ✓Based on published, citable sources (Cunningham JJ, Am J Clin Nutr 1980;33:2372-4)
- ✓Free forever with no sign-up, account or app install
Frequently asked questions
How does the Cunningham RMR Calculator (Athletes) work?+
Cunningham re-analysed the Harris–Benedict dataset and found fat-free mass explained almost all the variance — his equation slightly out-performs Katch–McArdle in lean, trained athletes, which is why sports-nutrition position stands cite it. The calculation uses the formula: RMR = 500 + 22 × FFM(kg). Everything runs instantly in your browser as you type — your inputs are never uploaded.
Is the Cunningham RMR Calculator (Athletes) accurate, and what is it based on?+
The method is traceable to authoritative sources, including Cunningham JJ, Am J Clin Nutr 1980;33:2372-4; Thomas DT et al., ACSM/AND/DC Position Stand 2016. Results are estimates — individual variation always applies, so treat the output as a well-grounded starting point.
Is the Cunningham RMR Calculator (Athletes) free and private?+
Yes. It's completely free with no sign-up, and all computation happens locally in your browser, so none of your health data ever leaves your device.
Can I use this for medical decisions?+
This tool is for general fitness information only, not medical or training advice. Consult a professional before changing your routine.
What can I use the Cunningham RMR Calculator (Athletes) for?+
It's commonly used for cunningham equation, rmr athletes, ffm metabolic rate. The 500 + 22 × FFM equation sports dietitians prefer for trained athletes with measured body composition.
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