How these health calculators fit together
- Start with the BMI Calculator to see where your weight sits relative to your height. Indian guidelines treat 23–24.9 as overweight, which is lower than the WHO’s 25.
- Use the BMR Calculator to find how many calories your body burns at rest (Mifflin-St Jeor equation).
- Set a daily target with the Calorie Calculator. It multiplies BMR by your activity level and adjusts for a goal of maintaining, losing or gaining weight, with a protein, carb and fat split.
- Stay hydrated with the Water Intake Calculator, which adjusts for body weight, exercise and hot Indian summers.
The formulas we use and why
| Calculator | Method | Source |
|---|---|---|
| BMI | kg ÷ m², WHO and Asian-Indian categories | WHO; Misra et al., JAPI 2009 consensus |
| BMR | Mifflin-St Jeor equation | Am J Clin Nutr, 1990 |
| Calories (TDEE) | BMR × activity factor (1.2–1.9) | Standard dietetics practice |
| Water | ~33 ml/kg + exercise and climate allowances | Clinical rule of thumb; EFSA reference values |
Use the numbers wisely
Population formulas are typically accurate to within about ±10% for healthy adults. Your real needs may be different. The best approach is to use the result as a starting point, track your weight and how you feel for two to three weeks, and adjust. Pair any number with waist measurement, sleep, activity and how you feel day to day.
These tools are for general information and education only. They are not a substitute for professional medical advice, diagnosis or treatment. Children, pregnant or breastfeeding women, older adults and anyone with a medical condition (diabetes, thyroid, kidney or heart disease, or a history of eating disorders) should consult a doctor or registered dietitian.