Online health math is popular because it is fast. It is also easy to over-trust. BMI is a ratio. BMR and TDEE are equation estimates. Macros are planning ranges.
A responsible sequence
- Check BMI with correct units.
- Estimate BMR with a standard equation.
- Apply an activity factor for TDEE.
- Explore macro splits as informational targets.
What these tools cannot do
They cannot diagnose disease, prescribe medication, or replace clinical judgment. Pregnancy, athletic builds, and medical conditions change how useful a number is.
Utila links
BMI Calculator → BMR → TDEE → Macro Calculator. Read the disclaimers on each page.
Bottom line
Use numbers to prepare better questions for professionals — not to self-treat.
