Quick Answer
To estimate your daily calories, first calculate BMR with the Mifflin-St Jeor equation — for men 10 × weight (kg) + 6.25 × height (cm) − 5 × age + 5, and for women the same with −161 instead of +5 — then multiply by an activity factor from 1.2 (sedentary) to 1.9 (very active). A 30-year-old man of 70 kg and 175 cm who exercises 3–5 days a week needs about 2,556 kcal a day to maintain weight.
What is a Calorie Calculator?
A Calorie Calculator (कैलोरी कैलकुलेटर) estimates how much energy your body uses each day and, from that, how many calories you might eat to lose, maintain or gain weight. It works in two steps. First it estimates your basal metabolic rate (BMR) — the calories you would burn lying still all day. Then it multiplies BMR by an activity factor to estimate your total daily energy expenditure (TDEE), often called maintenance calories.
This calculator uses the Mifflin-St Jeor equation, which studies have found to be one of the more accurate prediction equations for healthy adults. It shows your BMR, TDEE, targets for mild and standard weight loss and for weight gain, warns you if a target is too low to be safe without supervision, and gives example protein, carbohydrate and fat amounts. Every number is an estimate — a starting point you refine by watching what actually happens to your weight over a few weeks.
Key Features
- BMR by the Mifflin-St Jeor equation for men and women.
- TDEE with five clearly described activity levels.
- Goal targets — mild loss (−250), loss (−500) and gain (+500 kcal a day).
- Safety warning if a target drops below common minimum intakes.
- Macro table — protein, carbs and fat in grams for three common splits.
- Metric or US units — kg and cm, or pounds plus feet and inches.
- Private — calculated in your browser, nothing uploaded.
How to Use It — Step by Step
- Enter age and sex. The equation is designed for adults; use it from about 18 years of age.
- Enter weight and height in metric or US units.
- Choose your activity level honestly, based on a typical week.
- Read your BMR and maintenance calories (TDEE).
- Choose a target from the loss or gain boxes, and look at the macro table for a balanced split.
- Track and adjust. After two to three weeks, compare your average weight with your goal and adjust by 100–200 kcal if needed.
The Formulas with Worked Examples
Mifflin-St Jeor BMR (weight in kg, height in cm, age in years):
- Men: BMR = 10 × weight + 6.25 × height − 5 × age + 5
- Women: BMR = 10 × weight + 6.25 × height − 5 × age − 161
Example 1 — man, 30 years, 70 kg, 175 cm, moderately active: BMR = 700 + 1,093.75 − 150 + 5 = 1,649 kcal. TDEE = 1,648.75 × 1.55 = 2,556 kcal a day. A 500 kcal deficit gives about 2,056 kcal; a 500 kcal surplus about 3,056 kcal.
Example 2 — woman, 28 years, 60 kg, 160 cm, lightly active: BMR = 600 + 1,000 − 140 − 161 = 1,299 kcal. TDEE = 1,299 × 1.375 = 1,786 kcal a day. A 500 kcal deficit would be 1,286 kcal — just above the common 1,200 kcal floor, so a smaller 250 kcal deficit plus more activity may be easier to sustain.
Activity Levels Explained
| Level | Factor | Typical week |
|---|---|---|
| Sedentary | 1.2 | Desk job, little or no planned exercise |
| Lightly active | 1.375 | Light exercise or sports 1–3 days a week |
| Moderately active | 1.55 | Moderate exercise 3–5 days a week |
| Very active | 1.725 | Hard exercise 6–7 days a week |
| Extra active | 1.9 | Physical job plus training, or twice-daily training |
People often overestimate their activity. If you walk a little and go to the gym three times a week but sit for most of the day, “lightly active” may describe you better than “moderately active”. It is better to start lower and increase if you lose weight faster than planned.
Losing, Maintaining or Gaining Weight
- Maintain: eat around your TDEE.
- Lose steadily: eat 250–500 kcal below TDEE. The old rule says a 500 kcal daily deficit equals about 0.45 kg (1 lb) a week, but real loss usually slows over time as the body adapts.
- Gain muscle: eat 250–500 kcal above TDEE and follow a progressive strength-training programme.
- Avoid extremes: very large deficits increase muscle loss, tiredness and the chance of regaining weight.
Understanding the Macro Table
Calories come from three macronutrients: protein and carbohydrates provide about 4 kcal per gram, and fat about 9 kcal per gram. The calculator shows grams for three common splits at your maintenance calories — balanced (30% protein, 40% carbs, 30% fat), higher protein (35/35/30) and lower carb (35/25/40). For a 2,556 kcal day, the balanced split is about 192 g protein, 256 g carbs and 85 g fat. These are examples, not prescriptions; many people do well on a wide range of splits as long as total calories, protein and food quality are sensible.
Practical Tips for Indian Diets
- Watch the oil and ghee: one tablespoon of oil is around 120 kcal, so tadka and fried snacks add up quickly.
- Add protein to every meal: dal, paneer, curd, eggs, chicken, fish, chana and soya help you feel full.
- Measure rice and roti portions for a week to learn what a typical serving really is.
- Count drinks: sweet chai, juices, lassi and soft drinks can add several hundred calories a day.
- Fill half the plate with vegetables and salad for volume with few calories.
Why Your Numbers Change Over Time
Your calorie needs are not fixed. As you lose weight, your BMR falls because a smaller body needs less energy, and everyday movement often drops a little without you noticing. Ageing also lowers BMR gradually — the equation subtracts 5 kcal for every year of age. Building muscle through strength training can offset part of this. That is why it is worth recalculating after every 4–5 kg of change, or every few months, rather than following the same number forever.
Who Uses a Calorie Calculator?
- People starting a weight-loss plan who want a realistic daily target.
- Gym-goers planning a muscle-building phase.
- Anyone curious about how many calories they burn in a day.
- Coaches and trainers setting starting points for clients.
- People returning to fitness after a break who need fresh numbers.
Common Mistakes to Avoid
- Picking too high an activity level — the most common reason targets do not work.
- Eating back exercise calories — the activity factor already includes exercise.
- Cutting too hard — very low intakes are hard to sustain and can harm health.
- Judging by daily weight — water and food volume change daily weight; look at a weekly average.
- Never recalculating — your TDEE falls as you lose weight; recalculate every 4–5 kg.
Tips and Troubleshooting
- “Enter age 15–100…” — the inputs must be realistic for an adult; check units (cm, not metres).
- Switching units carries your current weight and height across automatically.
- Warning about the minimum — choose the mild-loss target or add activity instead of eating less.
- Results seem high — try the next lower activity level and compare with your real weight trend.
Quick Glossary
- Calorie (kcal): a unit of energy in food; food labels use kilocalories.
- BMR: energy used at complete rest.
- TDEE: total daily energy expenditure including activity.
- Deficit / surplus: eating fewer / more calories than TDEE.
- Macros: protein, carbohydrates and fat.
- NEAT: non-exercise activity such as walking, standing and household work — a big, often overlooked part of TDEE.
Why Use This Calorie Calculator?
It uses a well-regarded equation, explains every number, warns you about unsafe targets and gives practical macro amounts — all without sign-up and with your data staying on your device. Treat the results as estimates and talk to a doctor or registered dietitian before major diet changes, especially if you have a medical condition, are pregnant or breastfeeding, or are under 18.
Calorie Calculator — Key Facts
| BMR equation | Mifflin-St Jeor: 10W + 6.25H − 5A + 5 (men), −161 (women) |
|---|---|
| TDEE | BMR × activity factor (1.2 / 1.375 / 1.55 / 1.725 / 1.9) |
| Weight loss | About 250–500 kcal below TDEE per day |
| Weight gain | About 250–500 kcal above TDEE per day |
| Safety | Warns below ~1,200 kcal (women) or ~1,500 kcal (men) |
| For | Healthy adults; estimates only — not medical advice |
Frequently Asked Questions
What is BMR?
BMR (basal metabolic rate) is the energy your body uses at complete rest to keep you alive — breathing, circulation, temperature and cell repair. It is usually the largest part of daily energy use.
What is TDEE?
TDEE (total daily energy expenditure) is the calories you burn in a day including activity. It is estimated as BMR multiplied by an activity factor, and it is the intake that keeps your weight stable.
Why the Mifflin-St Jeor equation?
Research comparing prediction equations has found Mifflin-St Jeor to be among the most accurate for healthy adults, which is why many dietitians use it. Like all equations, it gives an estimate, and individuals can differ by 10% or more.
How many calories should I eat to lose weight?
A deficit of about 250–500 kcal a day below your TDEE is a common, sustainable starting point. It is often estimated to lead to roughly 0.25–0.5 kg loss per week, but real results vary with water, muscle and adherence.
Does a 3,500-calorie deficit always equal 1 pound of fat?
It is a rough rule of thumb. In reality, weight loss slows over time as your body adapts and as you weigh less, so long-term results are usually smaller than this simple rule predicts.
What is the minimum I should eat?
General guidance is not to go below about 1,200 kcal a day for women or 1,500 kcal for men without medical supervision. Very low intakes can cause nutrient deficiencies and muscle loss. The calculator warns you if a target goes below these levels.
Which activity level should I choose?
Choose based on a typical week, not your best week. Most office workers who exercise 3–5 times a week fit “moderately active”. If unsure, choose the lower level and adjust after a few weeks of tracking your weight.
How many calories do I need to gain muscle?
A small surplus of about 250–500 kcal above TDEE, combined with strength training and enough protein, is a common approach. Larger surpluses mostly add fat.
How much protein do I need?
The calculator shows sample splits. Many active adults aim for roughly 1.2–2.0 g of protein per kg of body weight, but needs depend on your health, age and goals — ask a dietitian for personal advice.
Is this calculator suitable for pregnant women or teenagers?
No. Pregnancy, breastfeeding, growth in teenagers and many medical conditions change energy needs. Consult a doctor or registered dietitian.
Why is my weight not changing even at the target?
Food tracking is often less accurate than we think, and activity estimates can be too high. Track honestly for 2–3 weeks, then adjust intake by 100–200 kcal based on the trend in your weight.
Is the Calorie Calculator free?
Yes. It is free with no sign-up, and your data stays in your browser. It provides estimates for information only and is not medical advice.
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