Calculator
BMI calculator
BMI turns up on intake forms and eligibility criteria, so it is worth being able to work out. It is also a blunt instrument, and worth understanding as one.
How it is worked out
The formula
BMI = weight in kilograms ÷ (height in metres)². For 82 kg at 1.78 m: 82 ÷ 3.168 = 25.9.
What it misses
BMI cannot distinguish muscle from fat, and does not account for where weight sits on the body, or for differences across ancestry and age. Two people with the same BMI can be in very different health.
Why it still appears
Because it is cheap to compute and widely used in eligibility criteria and research. Being able to work yours out is useful precisely because other people will.
Common questions
Does Cafeity use BMI for anything?
Is there a better measure?
This is general wellness information
Cafeity does not diagnose, treat or prevent any condition, and never recommends, calculates or adjusts a medication dose. Anything on this page is arithmetic you can check, not advice. Questions about your treatment belong with a licensed healthcare professional.
Other calculators
- Protein calculator — A daily protein figure from body weight, using the same 1.4 g/kg derivation as the app.
- Water intake calculator — A daily hydration figure from body weight, on the same 33 ml/kg basis as the app.
- Fibre intake reference — The 25 g daily reference the app logs against, and how it is counted.
- TDEE calculator — BMR and total daily energy expenditure via Mifflin–St Jeor, shown as an estimate.