Health Tools
All Health Tools
Free health calculators — BMI with waist-to-hip ratio, plus a calorie & TDEE calculator with macros. Private, instant, no data stored.
BMI Calculator
Calculate your Body Mass Index quickly.
Calorie Calculator
Calculate daily calories, TDEE, and protein/carb/fat macros. Imperial & metric.
About
Simple Health Calculators, Zero Data Collected
The BMI Calculator shows where your weight falls for your height (WHO categories), your healthy weight range and ideal weight, plus a built-in Waist-to-Hip Ratio check. The Calorie & TDEE Calculator turns that into a daily calorie target and protein/carb/fat macros. All work in metric or imperial.
Your health data stays on your device. Nothing is transmitted to a server or stored. Use the results as a starting point for a conversation with your doctor, not as a medical diagnosis.
BMI + Waist-to-Hip
BMI with healthy range and ideal weight, plus a WHR risk check.
Calories & Macros
TDEE-based daily calorie target with protein/carb/fat split.
Metric & Imperial
kg/cm, lbs/inches, and stone — switch with one tap.
No Data Stored
Everything is calculated in your browser. Nothing is transmitted.
Use Cases
When to Use These Health Tools
Starting a Fitness Journey
Get a baseline BMI reading before starting a new exercise or diet plan. Recalculate monthly to track progress against your healthy weight range.
Before a Doctor's Appointment
Calculate your BMI ahead of a GP or specialist visit so you arrive informed. Many clinical intake forms ask for BMI — have it ready.
Setting Weight Goals
Use the healthy BMI range (18.5–24.9) to calculate a target weight for your height. Plan a realistic goal before adjusting diet or exercise.
Tracking Weight Changes
Recalculate BMI periodically as you lose or gain weight. A dropping BMI over weeks and months indicates meaningful progress.
Planning a Diet or Cut
Once you know your BMI goal, find the daily calories and macros to get there with the Calorie & TDEE calculator — for losing, maintaining, or gaining weight.
Checking Heart-Health Risk
BMI ignores where you carry fat. Use the Waist-to-Hip Ratio tab to gauge body-shape health risk — useful for muscular builds where BMI alone overstates fat.
FAQ
Frequently Asked Questions
Weight (kg) ÷ height (m)². For imperial: weight (lbs) × 703 ÷ height (inches)². The calculator handles both automatically.
Underweight: < 18.5 | Normal: 18.5–24.9 | Overweight: 25–29.9 | Obese: ≥ 30. These follow WHO standard classifications.
Either — the calculation is identical. Toggle the unit switch and enter your preferred measurements.
BMI is a screening indicator, not a precise fat measurement. It may overestimate fat in athletes and underestimate in sedentary individuals. Consult a doctor for personalised advice.
No. BMI is calculated in your browser only and never transmitted or stored. We don't see any data you enter.
You can calculate the BMI, but interpreting it for children requires age and gender-specific percentile charts — consult a paediatrician for accurate guidance.
It estimates your BMR and TDEE with the Mifflin-St Jeor formula, gives a daily calorie target to lose, maintain, or gain weight, and breaks it into protein, carb and fat macros — in imperial or metric units.
It's on the BMI Calculator page (WHR tab). Enter waist and hip to get your ratio and the WHO risk band for your sex — elevated above 0.85 (women) / 0.90 (men). It complements BMI by showing fat distribution.