Calorie Calculator

This calorie calculator estimates how many calories your body needs each day to maintain, lose or gain weight. It first works out your Basal Metabolic Rate (BMR) — the energy you burn just staying alive at complete rest — and then scales that up by how active you are to give your Total Daily Energy Expenditure (TDEE), the total calories you burn in a typical day including movement, exercise and digestion.

Who it is for

It is built for anyone in India who wants a clear, science-based starting point for a diet or fitness plan: people trying to lose fat sustainably, those bulking to build muscle, gym-goers tracking their macros, and anyone simply wanting to understand their daily calorie needs before changing what they eat. The Goal Mode is handy if you have a target weight and a deadline and want to know the daily deficit required to get there. As with any health tool, treat the result as an informed estimate to plan around, not a medical prescription, and check with a doctor or dietitian before making big changes if you have a medical condition.

Applying it to an Indian diet

Once you know your target, the practical work is matching everyday meals to that number. A typical Indian thali, with two rotis, a katori of dal, a sabzi, rice and curd, can range widely in calories depending on the oil and ghee used, so portion control and cooking method matter as much as the food itself. To hit a protein-rich, calorie-aware plate, lean on dal, rajma, chana, paneer, eggs, curd and lean chicken, go easy on fried snacks and sweets, and remember that drinks like sugary chai, soft drinks and juices add up quickly. The calculator gives you the budget; choosing wholesome, filling foods within it is what makes the budget easy to stick to.

How it works — the Mifflin-St Jeor method

BMR is calculated with the Mifflin-St Jeor equation, widely regarded as the most accurate general formula for healthy adults. It uses weight in kilograms (w), height in centimetres (h) and age in years (a):

Men: BMR = 10w + 6.25h - 5a + 5

Women: BMR = 10w + 6.25h - 5a - 161

Your BMR is then multiplied by an activity factor to get TDEE: sedentary (1.2), lightly active (1.375), moderately active (1.55), very active (1.725) or extra active (1.9). To change weight from there, you adjust intake around TDEE: a deficit of roughly 500 calories a day produces about half a kilogram of loss per week, since around 7,700 calories equal one kilogram of body fat. The calculator shows several preset targets from a gentle 250-calorie change up to an aggressive 1,000-calorie swing.

A worked example

Take a 30-year-old man weighing 75 kg at 178 cm height who is moderately active. His BMR is 10 × 75 + 6.25 × 178 − 5 × 30 + 5 = 750 + 1,112.5 − 150 + 5 = about 1,718 calories. Multiplying by the moderately-active factor of 1.55 gives a TDEE of roughly 2,662 calories a day to maintain weight. To lose weight steadily he would aim for about 2,162 calories (a 500-calorie deficit), and to build muscle he might eat around 3,162 calories (a 500-calorie surplus).

Tips for using it well

• Be honest about your activity level — most people overestimate it; if unsure, pick the lower band.
• Recalculate every few kilograms, because BMR falls as you lose weight and your old targets stop being accurate.
• Prioritise protein and weigh yourself at the same time of day for a fair trend.
• Aim for a moderate, sustainable deficit rather than the most extreme option — slow loss preserves muscle.

Common mistakes to avoid

• Eating too little — do not drop below about 1,200 calories a day for women or 1,500 for men without medical supervision.
• Mixing up BMR and TDEE: eating at BMR alone leaves out all your daily activity and is far too low.
• Treating the number as exact — individual TDEE varies by around 15% due to genetics and non-exercise activity (NEAT).
• Ignoring food quality. Calories drive weight, but nutrients drive health, energy and how full you feel.