4 free health calculators — no sign-up, no ads, no paywall. → BMI Calculator — NHS-aligned ranges explained in plain English → TDEE & Calorie Calculator — 5 activity levels, targets for weight loss, maintenance & muscle gain → Blood Pressure Checker — AHA + NHS classification standards → Diabetes Risk Calculator — based on FINDRISC, the GP screening model Enter your numbers. Get your result instantly. That's it.