These calculators run entirely in your browser. The numbers you type are never sent to us, never stored, and never attached to an email address. There is nothing to sign up for and no result is held back.
TDEE calculator
Your BMR and total daily energy expenditure using the Mifflin-St Jeor equation — the same formula and the same safety floors the HealthMaxxing app uses.
SleepSleep-debt calculator
How far this week's nights fall short of your own target, and what that gap actually does and does not tell you.
Why nothing you type reaches us
Both calculators do their arithmetic in JavaScript on your device. There is no form submission, no request carrying your inputs, and no field that stores them. The pages do load our aggregate website counter, which records only short predefined categories — never a value you entered. Age, sex, weight, height and nightly sleep hours stay in the browser tab and disappear when you close it.
This is the same boundary the app works to, described in full in the privacy policy and the data and AI page.
What a calculator can and cannot tell you
Every one of these produces an estimate from a population equation. It describes what tends to be true of people with your inputs; it does not measure you. Real energy expenditure varies between people with identical measurements, and self-reported sleep is not a sleep study. Treat the output as a starting point to test against your own logs rather than a number to obey — which is the whole method.
None of these is a medical test, and none diagnoses, rules out, or treats anything. Medical questions belong with a clinician.
Want the pattern side rather than the arithmetic? The Pattern Atlas lists testable mind-body hypotheses with their evidence class and confounders, and HealthMaxxing is coming soon to iPhone and Android.