⚖️ BMI & Calorie Calculator
Calculate your Body Mass Index, healthy weight range, basal metabolic rate and daily calorie needs for weight loss, maintenance or gain.
Quick answer: BMI = weight in kg ÷ (height in m)². A healthy adult BMI is 18.5–24.9; for example, 70 kg at 1.75 m gives a BMI of 22.9.
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BMI & Calorie Calculator inputs
Result
Your BMI
22.9
Normal weight
Healthy weight for your height: 56.7 – 76.3 kg
- BMR (at rest)
- 1,649 kcal/day
- Maintenance (TDEE)
- 2,267 kcal/day
| Lose ~0.5 kg (1 lb) per week | 1,767 kcal |
| Lose ~0.25 kg (0.5 lb) per week | 2,017 kcal |
| Maintain weight | 2,267 kcal |
| Gain ~0.25 kg (0.5 lb) per week | 2,517 kcal |
BMI categories for adults
| BMI | Category |
|---|---|
| Below 18.5 | Underweight |
| 18.5 – 24.9 | Normal weight |
| 25 – 29.9 | Overweight |
| 30 – 34.9 | Obesity class I |
| 35 – 39.9 | Obesity class II |
| 40 and above | Obesity class III |
How daily calories are estimated
Your basal metabolic rate is calculated with the Mifflin–St Jeor equation, widely regarded as the most reliable everyday formula:
Men: 10 × kg + 6.25 × cm − 5 × age + 5
Women: 10 × kg + 6.25 × cm − 5 × age − 161
That figure is multiplied by an activity factor (1.2 for sedentary up to 1.9 for very active) to estimate your total daily energy expenditure. Weight-loss targets never go below 1,200 kcal (women) or 1,500 kcal (men) a day.
This tool is for general information only and is not medical advice. Children, teenagers, pregnant women and people with medical conditions should consult a healthcare professional.
Frequently asked questions
What is a healthy BMI?
For most adults a BMI between 18.5 and 24.9 is classed as a healthy weight, 25–29.9 as overweight and 30 or more as obese. Some health bodies use lower cut-offs for people of South Asian, Chinese and other Asian backgrounds.
How is BMI calculated?
BMI = weight in kilograms ÷ (height in metres)². In imperial units, BMI = 703 × weight in pounds ÷ (height in inches)².
Is BMI accurate?
BMI is a quick screening tool, not a diagnosis. It does not distinguish muscle from fat, so athletes may score as overweight. Waist measurement and a doctor's assessment give a fuller picture.
What are BMR and TDEE?
BMR (basal metabolic rate) is the energy your body uses at complete rest. TDEE (total daily energy expenditure) adds your activity. Eating about 500 kcal below TDEE typically leads to losing roughly 0.5 kg (1 lb) per week.