BMR Calculator

What is BMR?

BMR Calculator — Basal Metabolic Rate Calculator Free

Your BMR (Basal Metabolic Rate) is the number of calories your body burns at complete rest — just to stay alive. It accounts for all the energy needed to keep your heart beating, lungs breathing, brain functioning, and cells repairing themselves. BMR represents 60–70% of your total daily calorie burn.

Knowing your BMR is the foundation of any diet or fitness plan. It tells you the minimum calories your body needs to function — and from there, you can calculate your TDEE (Total Daily Energy Expenditure) by factoring in your activity level, giving you the exact calories to eat for weight loss, maintenance, or muscle gain. This BMR calculator India-specific tool accounts for South Asian body composition differences — Indians typically have lower muscle mass and higher body fat at the same BMI compared to Western populations, which directly affects BMR.

This free BMR calculator uses both the Mifflin-St Jeor equation (most accurate for general use, validated by the American Journal of Clinical Nutrition) and the Harris-Benedict equation (the original gold standard) so you can compare both results and use the average if you prefer. Use this as your free basal metabolic rate calculator, metabolic rate calculator, or calorie burn calculator — all in one tool.

How to Use This BMR Calculator

BMR Formula

How to Calculate BMR — BMR Formula Explained

There are three main BMR formulas used by dietitians and health professionals. The Mifflin-St Jeor equation is the most accurate for most people and is recommended by the Academy of Nutrition and Dietetics.

Mifflin-St Jeor vs Harris-Benedict Calculator

The Mifflin-St Jeor equation, published in the American Journal of Clinical Nutrition in 1990, consistently outperforms the Harris-Benedict formula in accuracy studies. Research shows it predicts BMR within 10% for 82% of people, compared to 75% for Harris-Benedict. The Harris-Benedict calculator tends to slightly overestimate BMR — especially in overweight individuals.

For most people, the two equations will give results within 50–150 kcal of each other. If they differ significantly, the Mifflin-St Jeor result is generally more reliable. The Katch-McArdle formula uses lean body mass and can be more accurate for very lean or very muscular individuals.

Calorie Burn

Calorie Burn Calculator — Resting Metabolic Rate Calculator

Your BMR is your resting metabolic rate — the baseline calorie burn that happens 24 hours a day, 7 days a week, even while you sleep. Understanding where these calories go helps you make smarter nutrition decisions.

What Burns Your BMR Calories?

How to increase metabolism: the most effective method is building muscle through resistance training. Every kilogram of muscle burns approximately 13 kcal/day at rest — nearly three times more than fat tissue (which burns about 4.5 kcal/kg/day). Building muscle through resistance training permanently raises your BMR and makes weight management easier long-term.

Calories burned sleeping equal approximately your BMR divided by 24, multiplied by hours slept — typically 400–600 kcal for a 7–8 hour sleep. For Indians specifically, ICMR guidelines note that South Asians have a higher percentage of body fat at any given BMI compared to Caucasians — meaning their metabolic rate is often lower relative to their total body weight. Prioritising resistance training and adequate protein intake (1.6–2.2 g/kg) is especially important.

Gender Differences

BMR Calculator for Women and BMR Calculator for Men

Men and women have different BMR values due to differences in body composition — specifically, men naturally carry more muscle mass and less body fat at the same weight, which means a higher resting metabolic rate.

BMR Calculator for Women

Women typically have a BMR 5–10% lower than men of the same age, height and weight. The Mifflin-St Jeor equation accounts for this with a −161 kcal constant for women vs +5 for men. For Indian women, average BMR ranges from 1,150–1,450 kcal/day depending on body size and age. Hormonal changes (PCOS, thyroid, menopause) can also affect BMR significantly — if your actual food intake is much lower than your calculated BMR, consult a doctor to rule out thyroid or metabolic conditions.

BMR Calculator for Men

Indian men typically have a BMR ranging from 1,500–1,900 kcal/day. Men with higher muscle mass — from regular resistance training — will sit at the upper end of this range. As men age, BMR decreases by approximately 1–2% per decade after age 20 due to gradual muscle loss (sarcopenia). This is why maintaining resistance training throughout life is essential for metabolic health.

BMR & Weight Loss

BMR and TDEE Calculator — Using BMR for Weight Loss

Your BMR is the foundation of your weight loss strategy. You should never eat below your BMR — doing so deprives your body of the energy it needs for basic organ function and triggers adaptive thermogenesis, where your body slows its metabolism in response to severe restriction.

The correct approach for BMR weight loss: calculate your TDEE (BMR × activity multiplier), then create a deficit of 300–500 kcal below your TDEE. This gives sustainable fat loss of 0.25–0.5 kg/week while keeping calories well above your BMR.

• Never go below BMR: eating less than your BMR slows metabolism and causes muscle loss
• 500 kcal deficit from TDEE = ~0.5 kg fat loss per week (7,700 kcal = 1 kg fat)
• High protein (1.6–2.2 g/kg) preserves muscle while in a calorie deficit
• Resistance training maintains and builds muscle, keeping BMR elevated during fat loss
• Recalculate your BMR every 5 kg lost — as weight drops, BMR decreases too

What is a Good BMR?

A "good" BMR depends on your gender, age and body size. A higher BMR is generally better — it means you burn more calories at rest and have more flexibility in your diet. For Indian adults: men with BMR above 1,700 kcal are above average; women with BMR above 1,350 kcal are above average. The most effective way to raise your BMR is to build muscle mass through consistent resistance training.

Common Questions

Frequently Asked Questions