BMI Calculator vs NHS BMI calculator

Both calculate Body Mass Index from your height and weight for free with no account. The NHS calculator is an authoritative UK health resource with tailored advice; Gera Tools' calculator computes BMI (plus BMR/TDEE) instantly in your browser.

For health guidance in the UK, use the NHS calculator — it's authoritative and gives tailored advice. For a quick BMI (and BMR/TDEE) number that you can compute privately in your browser, Gera Tools is fast and free.

Open the free BMI Calculator →

Side-by-side comparison

Feature BMI Calculator Gera Tools NHS BMI calculator nhs.uk
Price Free, no paywall Free
Account required No account, ever No account needed to use the core tool
Processing location 100% in your browser — input never uploaded Not guaranteed client-side; treat pasted/uploaded data as leaving your machine unless the tool states otherwise
Usage limit No daily/size cap (limited only by your device memory) No hard documented cap for the basic free action
Clinical / personalised health advice Shows BMI category bands (general information only) Provides NHS-authored health guidance and next steps
Ads Light, single ad slot; never blocks the tool Ad-supported free tier
Works offline after load Yes — keeps working with no network Depends on implementation

Comparison based on each tool's publicly stated, free-tier behaviour at the time of writing. NHS BMI calculator is a trademark of its respective owner; we link to it for fairness and do not claim affiliation. Where NHS BMI calculator is genuinely stronger, the table says so.

FAQ

Does it also calculate BMR and TDEE?

Yes. Gera Tools' calculator returns BMI plus basal metabolic rate and total daily energy expenditure estimates.

Is this medical advice?

No. Gera Tools provides general information only; for health decisions consult the NHS tool or a healthcare professional.

Is my data uploaded?

No. The calculation runs in your browser; your height and weight are not sent anywhere.