"How many calories should I eat?" is one of the most Googled health questions on the internet. And it's the right question — because without knowing your personal calorie needs, all the diet advice in the world won't help.
The answer depends on your TDEE — Total Daily Energy Expenditure. This guide explains what TDEE is, how to calculate it, and how to use it to reach any body composition goal.
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What Is TDEE?
TDEE (Total Daily Energy Expenditure) is the total number of calories your body burns in 24 hours — including:
- BMR: calories burned at rest just to keep you alive
- TEF: thermal effect of food (digestion burns ~10% of calories consumed)
- NEAT: non-exercise activity thermogenesis (fidgeting, standing, walking to work)
- EAT: exercise activity thermogenesis (deliberate workouts)
TDEE is your personal calorie maintenance level. Eat at TDEE = weight stays the same. Eat below = lose weight. Eat above = gain weight.
Step 1: Calculate BMR
BMR (Basal Metabolic Rate) is your calorie burn at complete rest.
Mifflin-St Jeor Formula (Most Accurate for Non-Athletes)
Men: BMR = (10 × weight_kg) + (6.25 × height_cm) − (5 × age) + 5
Women: BMR = (10 × weight_kg) + (6.25 × height_cm) − (5 × age) − 161
Example 1 — Male, 28 years, 75 kg, 178 cm: BMR = (750) + (1112.5) − (140) + 5 = 1,727.5 cal
Example 2 — Female, 25 years, 60 kg, 163 cm: BMR = (600) + (1018.75) − (125) − 161 = 1,332.75 cal
This is how many calories each person burns doing absolutely nothing all day.
Step 2: Calculate TDEE with Activity Multiplier
Multiply BMR by the activity factor that best matches your weekly lifestyle:
| Level | Description | Multiplier |
|---|---|---|
| Sedentary | Office job, no exercise, mostly sitting | × 1.2 |
| Lightly Active | 1–2 light workouts/week, casual walking | × 1.375 |
| Moderately Active | 3–5 workouts/week | × 1.55 |
| Very Active | 6–7 intense workouts/week | × 1.725 |
| Extra Active | Physical labour job + daily training | × 1.9 |
Example 1 (Male, moderately active): TDEE = 1,727.5 × 1.55 = 2,678 calories/day
Example 2 (Female, lightly active): TDEE = 1,332.75 × 1.375 = 1,832 calories/day
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How to Use Your TDEE for Your Goal
| Goal | Daily Calories | Expected Rate |
|---|---|---|
| Lose weight fast | TDEE − 750 to −1,000 | 0.7–1 kg/week |
| Lose weight standard | TDEE − 500 | ~0.5 kg/week |
| Slow cut | TDEE − 200 to −300 | ~0.2–0.3 kg/week |
| Maintain weight | TDEE | 0 change |
| Slow muscle gain (lean bulk) | TDEE + 200 to +300 | 0.2–0.3 kg/week |
| Fast bulk | TDEE + 500 | ~0.5 kg/week |
For the male example above (TDEE = 2,678):
- Fat loss: 2,678 − 500 = 2,178 cal/day
- Maintenance: 2,678 cal/day
- Muscle gain: 2,678 + 250 = 2,928 cal/day
Does TDEE Change Over Time?
Yes, and understanding this prevents frustration.
Reasons TDEE decreases during fat loss:
- Lighter body burns fewer calories — as you lose weight, your BMR drops
- Metabolic adaptation — the body becomes more efficient at lower calorie intake
- Less NEAT — people unconsciously move less when eating fewer calories
Rule of thumb: Recalculate your TDEE every 4–6 weeks, or whenever you've lost 3–5 kg.
Reasons TDEE can increase:
- Building muscle (muscle burns ~6 cal/lb/day, fat burns ~2)
- Increasing activity level
- Being younger (BMR is higher in younger people)
Macros: What to Eat Within Your Calorie Target
Hitting your calorie target is the first priority. But what those calories are made of affects your body composition (how much muscle vs fat you keep or build).
The Three Macronutrients
Protein: 4 cal/gram
- Builds and preserves muscle
- Most satiating per calorie
- Highest thermic effect (you burn ~25% of protein calories just digesting it)
- Target: 1.6–2.2g per kg of body weight
Carbohydrates: 4 cal/gram
- Primary energy source, especially for brain and high-intensity exercise
- Not inherently fattening — excess total calories cause fat gain
- Include fibre-rich carbs (oats, rice, fruit, vegetables, dal, rotis)
Fats: 9 cal/gram
- Essential for hormones, brain function, fat-soluble vitamins (A, D, E, K)
- Very calorie-dense — easy to overeat
- Target: at least 0.8–1g per kg of body weight minimum
Example Macro Setup (2,178 cal cut, 75kg male):
- Protein: 150g × 4 = 600 cal (27%)
- Fat: 65g × 9 = 585 cal (27%)
- Carbs: 248g × 4 = 993 cal (46%)
- Total: 2,178 cal ✓
Indian Foods with High Protein (for Reference)
Protein is often the hardest macro to hit on Indian diets. Here's a practical reference:
| Food | Serving | Protein | Calories |
|---|---|---|---|
| Chicken breast (grilled) | 100g | 31g | 165 |
| Eggs (whole) | 1 egg | 6g | 70 |
| Paneer | 100g | 18g | 265 |
| Dal (any, cooked) | 1 cup (200g) | 18g | 230 |
| Greek yogurt / Dahi (low fat) | 100g | 10g | 60 |
| Tofu (firm) | 100g | 8g | 76 |
| Rajma (cooked) | 1 cup | 15g | 230 |
| Skimmed milk | 250ml | 9g | 90 |
| Whey protein powder | 30g scoop | 24g | 120 |
| Tuna (canned) | 100g | 26g | 116 |
What About Intermittent Fasting and Keto?
These are popular approaches, but they work because of their effect on calories — not because of any magical metabolic property.
Intermittent Fasting (IF): 16:8, 5:2, OMAD — these work by restricting the eating window, which makes it easier to eat fewer total calories. If you eat your full TDEE within a 8-hour window, you won't lose weight.
Keto: Very low carb, high fat diet. Works by reducing total calorie intake (fat is very satiating, and people tend to eat less on keto), not by some fat-burning advantage of ketosis.
Bottom line: Any diet that creates a calorie deficit will produce weight loss. The "best" diet is the one you can consistently maintain while hitting your protein target.
Common TDEE Mistakes
Choosing Too High an Activity Multiplier
Most people overestimate their activity level. A 45-minute gym session 3 times a week in an otherwise sedentary office job = lightly active (1.375), not moderately or very active.
Overestimating activity leads to overestimating TDEE, which means you're eating at maintenance (or even surplus) while thinking you're in a deficit.
Fix: Choose the multiplier conservatively. You can always add calories back if you're losing too fast.
Not Adjusting After Weight Loss
Your TDEE when you weigh 90 kg is meaningfully different from your TDEE at 75 kg. Recalculate every 4–6 weeks.
Ignoring Tracking Accuracy
Measuring food by volume ("one cup") introduces 20–30% error. Weighing with a kitchen scale is far more accurate.
Expecting Linear Progress
Weight naturally fluctuates by 1–3 kg from day to day (water, food in gut, hormones). Track weekly averages for meaningful data.
TDEE for Special Cases
For Athletes
The Mifflin-St Jeor formula underestimates TDEE for athletes with low body fat. The Katch-McArdle formula uses lean body mass for more accuracy: BMR = 370 + (21.6 × lean mass in kg)
For Very Overweight Individuals
Higher body fat means less metabolic tissue per kilogram. BMR formulas may overestimate. Adjust calorie targets if weight loss stalls beyond the expected adaptation.
For Pregnant or Breastfeeding Women
TDEE and calorie needs are significantly higher. This calculator is not intended for pregnancy planning — consult an OB-GYN.
Frequently Asked Questions
What is a normal TDEE for an Indian adult?
Average sedentary Indian man (65kg, 170cm, 30y): ~1,900 cal. Average sedentary Indian woman (55kg, 155cm, 28y): ~1,550 cal. These are just starting estimates — individual variation is significant.
How accurate is the TDEE calculator?
Mifflin-St Jeor is accurate within 10–15% for most people. Use it as a starting point. Track actual weight changes over 2 weeks and adjust by 100–200 cal if results don't match expectations.
Why am I not losing weight at my calculated deficit?
Most common reasons: (1) calorie tracking errors (underestimating portions), (2) activity multiplier too high, (3) not enough time (weight fluctuates — track for 2+ weeks), (4) medical conditions like hypothyroidism.
Can I eat at my TDEE and still build muscle?
No, not efficiently. Muscle building requires a slight calorie surplus (200–500 cal). However, beginners or those returning to training may gain muscle and lose fat simultaneously at maintenance.
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