Calorie Calculator for Weight Loss, How Big Should Your Deficit Be?
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Open Calorie CalculatorWeight loss has a simple formula: consume fewer calories than your body burns. But the execution is where most people fail. Cut too little and nothing happens. Cut too aggressively and your metabolism crashes, you lose muscle, feel exhausted, and eventually rebound. The sweet spot, the deficit that produces steady fat loss while preserving muscle, energy, and sanity, is what this guide helps you find.
Research consistently shows that a moderate calorie deficit of 500-750 calories below maintenance produces the best long-term results: 0.5-0.75 kg of fat loss per week, minimal muscle loss, no metabolic damage, and crucially, it's sustainable for months. Crash diets (1,000+ calorie deficits) produce faster scale changes but 80-95% of crash dieters regain the weight within 12 months. Let's do this right.
Step 1: Calculate Your BMR
The Mifflin-St Jeor equation is the gold standard recommended by the Academy of Nutrition and Dietetics. It is more accurate than the older Harris-Benedict equation and is the formula most clinical dietitians use today.
For men:
BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) + 5
For women:
BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age in years) − 161
Worked example
A 30-year-old woman, 160 cm tall, weighing 75 kg:
BMR = (10 × 75) + (6.25 × 160) − (5 × 30) − 161
BMR = 750 + 1,000 − 150 − 161 = 1,439 kcal/day
Step 2: Calculate Your TDEE
Your Total Daily Energy Expenditure (TDEE) is your BMR multiplied by an activity factor:
Little or no exercise, desk job
Light exercise 1-3 days/week
Moderate exercise 3-5 days/week
Hard exercise 6-7 days/week
Very hard exercise + physical job or 2x training
Continuing the example
Our 30-year-old woman walks daily and does light yoga 3x/week (lightly active):
TDEE = 1,439 × 1.375 = 1,979 kcal/day
This is her maintenance calories, eating this much, her weight stays the same.
Step 3: Subtract Your Weight Loss Deficit
Moderate Deficit (−500 kcal)
1,979 − 500 = 1,479 kcal/day
Expected loss: ~0.5 kg per week (~2 kg/month)
Best for: Most people. Sustainable, preserves muscle, maintains energy.
Aggressive Deficit (−750 kcal)
1,979 − 750 = 1,229 kcal/day
Expected loss: ~0.75 kg per week (~3 kg/month)
Best for: Those with significant weight to lose (BMI 30+). Not recommended for extended periods.
Never go below 1,200 kcal/day (women) or 1,500 kcal/day (men) without medical supervision. Below these floors, you risk nutrient deficiencies, muscle loss, metabolic slowdown, hair loss, hormonal disruption, and gallstone formation. If your calculated deficit target falls below these floors, use the floor number instead and increase your activity level to create additional deficit through exercise.
Check your current BMI with our BMI Calculator to understand how much weight you need to lose.
Weight Loss Calorie Targets by Body Weight
| Current Weight | Sedentary TDEE | Moderate Active TDEE | −500 Deficit | −750 Deficit |
|---|---|---|---|---|
| 60 kg | 1,500 | 1,870 | 1,370* | 1,200* |
| 65 kg | 1,560 | 1,940 | 1,440 | 1,200* |
| 70 kg | 1,620 | 2,010 | 1,510 | 1,260 |
| 75 kg | 1,680 | 2,090 | 1,590 | 1,340 |
| 80 kg | 1,740 | 2,170 | 1,670 | 1,420 |
| 85 kg | 1,800 | 2,250 | 1,750 | 1,500 |
| 90 kg | 1,860 | 2,330 | 1,830 | 1,580 |
| 95 kg | 1,920 | 2,410 | 1,910 | 1,660 |
| 100 kg | 1,980 | 2,490 | 1,990 | 1,740 |
* Values marked with asterisk hit close to or below the 1,200 kcal floor. Use 1,200 as minimum and add exercise for additional deficit.
Estimates for women aged 25-40, height ~160 cm. Male targets are typically 200-400 kcal higher. For precise numbers, use our calorie calculator tool.
Calorie Counts for Common Foods
Smart Swaps That Save Calories
Regular chai with sugar (90 kcal) → Green tea or black coffee (2 kcal)
save ~88 kcal × 3 cups = 264/day
2 parathas with ghee (500 kcal) → 2 phulkas with 1 tsp ghee (200 kcal)
save 300 kcal
Full-fat milk 1 glass (150 kcal) → Skim milk (90 kcal)
save 60 kcal
Fried samosa (260 kcal) → 1 bowl sprouts chaat (120 kcal)
save 140 kcal
White rice 1.5 cups (300 kcal) → Brown rice 1 cup (200 kcal)
save 100 kcal
Mango lassi (250 kcal) → Buttermilk/chaas (40 kcal)
save 210 kcal
Low-Calorie High-Volume Foods (eat freely)
- Cucumber16 kcal/cup
- Spinach/palak7 kcal/cup raw
- Tomato22 kcal/medium
- Cauliflower/gobi25 kcal/cup
- Bottle gourd/lauki15 kcal/cup
- Cabbage22 kcal/cup
- Mushrooms15 kcal/cup
- Green beans31 kcal/cup
Hidden Calorie Traps Most People Miss
- 1 tbsp cooking oil (often used 3-4x per meal)120 kcal each
- 1 tbsp ghee120 kcal
- 2 biscuits with tea120-160 kcal
- 1 handful namkeen150-200 kcal
- 1 glass packaged fruit juice110-140 kcal
- Restaurant dal makhani vs home dal350 vs 150 kcal
Sample 1,500-Calorie Weight Loss Day
Morning Ritual (~10 kcal)
1 glass warm water with lemon + optional methi water
Breakfast (~350 kcal)
2 moong dal cheelas (200) + mint chutney (10) + 1 cup green tea (2) + 1 small bowl curd (50) + 5 almonds (35) + 1 small fruit (55)
Mid-Morning (~80 kcal)
1 small apple (80) or 1 guava (70)
Lunch (~450 kcal)
Large salad first (30) + 1 bowl dal (150) + 1 bowl sabzi (80) + 1.5 jowar/bajra rotis (150) + 1 small bowl curd (40)
Evening Snack (~120 kcal)
1 cup masala chai without sugar (10) + roasted makhana 1 small bowl (110), or green tea (2) + sprouts chaat (120)
Dinner (~400 kcal)
Soup or salad (40) + 1 bowl dal/protein (160) + 1 bowl vegetable sabzi (80) + 1 roti (80) + small curd (40)
Before Bed (~0-50 kcal)
Herbal tea or warm turmeric water
Total: ~1,460-1,510 kcal | Protein: ~65g | Fiber: ~28g
This is one example day. Your personal plan should account for your food preferences, medical conditions (PCOS, thyroid, diabetes each require different macro ratios), and lifestyle. Our weight loss program creates fully personalized 7-day plans.
Why Your Weight Loss Stalls, And How to Fix It
1. Metabolic adaptation is real
After 4-6 weeks of deficit, your body reduces energy expenditure by 5-15%. This is normal. It does NOT mean your metabolism is "broken." It means your deficit has shrunk and needs recalculating. Recalculate your TDEE using your NEW (lower) weight every 4-6 weeks.
2. Water retention masks fat loss
You can lose fat while the scale stays flat or even goes up. Cortisol from stress, sodium intake, menstrual cycle, and intense exercise all cause temporary water retention. Trust the process for 2-3 weeks before adjusting. Take weekly waist measurements, they are more reliable than the scale.
3. Weekend overeating erases weekday deficits
A 500-calorie daily deficit = 3,500 kcal saved by Friday. One restaurant meal + drinks on Saturday can add 1,500-2,000 kcal. Sunday brunch adds another 800. Your weekly deficit drops from 3,500 to under 1,000, barely noticeable on the scale.
4. You are eating more than you think
Studies show that people underestimate calorie intake by 30-50%. The biggest culprits: cooking oil (measured vs poured), snacking between meals (untracked), and condiments/chutneys (seem small, add up). Track honestly for 1 week using our calorie calculator.
Should You Create Your Deficit Through Diet, Exercise, or Both?
The most effective approach is 70-80% diet deficit + 20-30% exercise deficit. For a 500-calorie daily deficit:
- Eat 350-400 fewer calories (skip the biscuits, use less oil, smaller rice portion)
- Burn 100-150 extra calories through activity (30-minute brisk walk = ~150 kcal)
Why not 100% exercise? You would need to run 5 km daily just to create a 350-calorie deficit. That is unsustainable for most people. Diet changes are easier to maintain consistently.
Why not 100% diet? Extreme calorie restriction without exercise causes disproportionate muscle loss. Muscle burns calories at rest. Losing muscle slows your metabolism. Strength training 2-3 times per week preserves muscle during a deficit, this is non-negotiable for quality weight loss.
Frequently Asked Questions
How many calories should I eat to lose 1 kg per week?
To lose 1 kg per week, you need approximately a 1,000-calorie daily deficit. However, this is aggressive and risks muscle loss, metabolic slowdown, and nutrient deficiencies. A 500-calorie deficit (losing 0.5 kg/week) is safer, more sustainable, and produces better long-term results. Slow weight loss stays off. Fast weight loss comes back.
Is 1,200 calories a day enough to lose weight?
1,200 calories is the minimum recommended floor for women. It will produce weight loss for most people, but it is difficult to get adequate nutrition at this level. If your calculated deficit target falls above 1,200, use that instead, going lower does not speed up results, it just increases hunger, fatigue, and the likelihood of quitting. For men, the floor is 1,500 calories.
Why am I not losing weight in a calorie deficit?
Four common reasons: (1) You are in a deficit but water retention is masking the fat loss, wait 2-3 more weeks. (2) You are eating more than you think, track honestly for 1 week. (3) Your TDEE has decreased because you have lost weight, recalculate using your current weight. (4) You have a medical condition affecting metabolism (hypothyroidism, PCOS, insulin resistance), get blood work done.
Should I eat back the calories I burn during exercise?
Generally no, or at most partially. Exercise calorie estimates (from watches, gym machines) overestimate by 20-50%. If your deficit target is 1,600 kcal/day and you burn 300 in exercise, eating 1,600 is fine, the exercise is creating additional deficit. Only eat back exercise calories if you feel genuinely weak, dizzy, or unable to complete workouts.
How often should I recalculate my calorie target?
Every 4-6 weeks, or whenever you lose 3-5 kg. Your TDEE decreases as your weight drops, so a deficit that worked at 80 kg may become maintenance at 72 kg. This is the most common reason for weight loss plateaus, people keep eating the same calories despite weighing less.
Is it better to count calories or just eat healthy?
Both approaches work, but calorie counting is more precise and eliminates guesswork. "Eating healthy" without awareness of portions can easily result in eating at maintenance, healthy foods still have calories. Counting is especially important for the first 4-6 weeks until you develop intuitive portion awareness. After that, many people can transition to mindful eating without strict tracking.
Need a personalized weight loss meal plan?
Our certified dietitian Jyoti Singh creates customized plans that hit your calorie and macro targets while accounting for medical conditions like PCOS, thyroid, or diabetes, with weekly adjustments based on your real-world response.
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