How the BMR formula works, step by step
Follow a complete Mifflin–St Jeor example and see exactly what the calculator can—and cannot—tell you.
Read the guide →The reading room
A number is a starting point.
Understanding comes next.
Ten practical guides to the assumptions, arithmetic, and limits behind the tools.
BMR, resting energy, and TDEE: what changes?
Separate resting-energy estimates from activity scenarios before comparing calorie numbers.
Read the guide →Why activity multipliers change your estimate
Explore the sensitivity of a daily-energy calculation without pretending an activity label is a measurement.
Read the guide →What an adult BMI result does and does not mean
Understand the arithmetic, category boundaries, and limitations of an adult screening measure.
Read the guide →Avoid centimetre, inch, pound, and stone mistakes
A practical input checklist with worked conversions for metric, US, and UK forms.
Read the guide →Calories and kilojoules: convert the unit correctly
Read food-energy units and reproduce a conversion without changing the underlying amount.
Read the guide →Calculate energy from protein, carbohydrate, and fat
Use the 4–4–9 convention and understand why a label may not match the simplified total.
Read the guide →Why two calorie calculators give different answers
Audit the equation, units, assumptions, and rounding before deciding a result is wrong.
Read the guide →Five calculations you can check by hand
A reproducible practice set for resting energy, activity scenarios, BMI, energy units, and macro totals.
Read the guide →How to read a health calculator’s claims critically
Look for a visible method, appropriate scope, and evidence that supports the actual claim being made.
Read the guide →