Is BMI the same as body fat percentage?

No. BMI uses height and weight only. It does not directly measure body fat, muscle mass or clinical risk.

Can I use this result as an official amount?

No. This result is a planning estimate only. Official payroll, tax, lending, property or medical decisions should be checked with official sources and qualified professionals.

UK health reference

UK BMI / Calorie Calculator

Estimate adult BMI, BMR and daily maintenance calories from height, weight, age, sex and activity. This is not medical advice.

Estimated BMI

Enter values to calculate Calculation basis date: 17 May 2026. NHS adult BMI reference and Mifflin-St Jeor BMR estimate.

Inputs

Height (cm) Weight (kg) Age Sex Activity factor

Calculation basis

BMI = weight(kg) / height(m)^2.
BMR uses the Mifflin-St Jeor equation; daily calories multiply BMR by activity factor.

Calculation Basis and Official Sources

Calculation basis date: 17 May 2026. Uses NHS adult BMI reference information and a common BMR estimation equation.

NHS - BMI healthy weight calculator

For symptoms, pregnancy, medication, diet changes or disease management, use NHS guidance and qualified healthcare professionals.

Formula and Interpretation

Formula

Calculate BMI from metric height and weight, estimate BMR from sex, age, height and weight, then multiply by activity factor.

How to read it

BMI is a screening measure and does not directly measure body fat, muscle, pregnancy status or clinical risk.

Medical and legal disclaimer

This calculator and its examples are for general information and rough estimation only. They are not medical diagnosis, treatment advice, pregnancy care advice, nutrition advice, emergency guidance, legal advice, tax advice, insurance advice or any other professional advice.

Actual health, pregnancy and nutrition decisions can differ because of symptoms, age, pregnancy status, medical history, medication, clinical measurements, ultrasound results and a clinician's judgement. Use a qualified health professional or medical service before acting on the result.

Calcitda does not guarantee accuracy, completeness, currentness or suitability for your situation. To the fullest extent permitted by law, we disclaim liability for losses, damages, claims or decisions arising from use of, or reliance on, this page.

Before You Rely on the Result

Practical examples

Enter 175 cm and 75 kg to see the BMI category.

Change activity level to see how maintenance calories move.

Use it as a rough health discussion aid, not as a diagnosis.

What this includes

Adult BMI estimate
BMR estimate
Daily maintenance calorie estimate

What this does not include

Children and teenagers
Pregnancy, clinical conditions and medication effects
Diet prescription or medical diagnosis

When to check official sources

Use NHS or a qualified healthcare professional before changing diet, medication, treatment or exercise because of this estimate.