🔥 Calorie Deficit & Weight Loss Planner

Calculate your exact daily calorie deficit, realistic timeline, and weekly milestones to reach your goal weight — sustainably.

✓ Science-Based Formula
✓ Mifflin-St Jeor TDEE
✓ Muscle Preservation Tips
✓ India-Friendly
Units:
Your Body Stats
Daily Calorie Needs (TDEE)

Not sure? Use the “Calculate TDEE for me” tab above ↑

Weight Loss Pace

How aggressively do you want to lose weight? (per week)

0.25 kg
per week
✅ Safest
0.5 kg
per week
⭐ Recommended
0.75 kg
per week
⚡ Faster
1.0 kg
per week
⚠️ Aggressive
📊 Your Weight Loss Plan
—
kcal/day
Daily Deficit Needed
—
kcal/day
Target Calories to Eat
—
weeks
Time to Goal
—
kg
Total Weight to Lose
—
kcal/day
Your TDEE (Maintenance)
—
g/day
Minimum Protein (Cut)
💪

Protein Needed to Preserve Muscle

During a caloric deficit, aim for 2.2–2.4g of protein per kg of body weight to minimize muscle catabolism and support recovery.

REALISTIC TIMELINE COMPARISON
Aggressive
—
weeks
—
⚠️ High Risk
Moderate ⭐
—
weeks
—
✅ Recommended
Conservative
—
weeks
—
🐢 Slowest
WEEKLY WEIGHT MILESTONES
🔥

Accelerate Your Cut with the Right Supplements

Hitting your protein targets is the #1 way to preserve muscle during a cut. GainsX Whey Protein (25g protein/scoop) makes it easy — and our Thermo Fat Burner helps mobilize stubborn fat while in a deficit.

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What Is a Calorie Deficit? The Science of Weight Loss

A calorie deficit occurs when you consume fewer calories than your body burns in a day. Since 1 kg of body fat stores approximately 7,700 kilocalories of energy, creating a consistent daily deficit is the only proven mechanism for fat loss — regardless of which diet you follow.

In India, where carbohydrate-rich diets (rice, roti, dal) are staples, managing a calorie deficit can feel challenging. However, the fundamentals remain the same: Total Energy In vs. Total Energy Out determines your weight trajectory.

How Is TDEE Calculated? (Mifflin-St Jeor Equation)

This calculator uses the Mifflin-St Jeor equation — widely considered the most accurate BMR formula for the general population — multiplied by an activity factor (PAL) to give your Total Daily Energy Expenditure (TDEE):

  • Men: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) + 5
  • Women: BMR = (10 × weight in kg) + (6.25 × height in cm) − (5 × age) − 161
  • TDEE = BMR × Activity Multiplier (1.2 to 1.9)

Why Crash Diets Fail — And How to Lose Fat Without Losing Muscle

Cutting calories too aggressively (more than 1,000 kcal/day below maintenance) triggers a series of counter-productive hormonal responses: cortisol spikes, leptin drops, metabolic adaptation, and rapid muscle catabolism. Studies show that up to 25–50% of weight lost on crash diets comes from lean muscle mass — not fat.

The golden rule for sustainable fat loss: aim to lose 0.5–0.75% of your body weight per week. For an 80 kg individual, that’s 400–600g per week — enough to preserve muscle, maintain performance, and keep your metabolism healthy.

The Role of Protein During a Calorie Deficit

Research consistently shows that consuming 2.2–2.4g of protein per kg of body weight during a caloric deficit is the most effective strategy to preserve lean muscle mass. High protein intake also increases diet-induced thermogenesis (you burn more calories digesting protein), reduces appetite, and stabilizes blood sugar — making adherence easier.

Understanding Water Weight vs. Fat Loss

In the first 1–2 weeks of a caloric deficit, you may notice rapid scale drops of 1–3 kg. This is primarily water weight — your body depletes glycogen stores (which bind water), and inflammation reduces. True fat loss begins around week 2–3 and proceeds at a slower, more consistent pace. Don’t be discouraged by slow weeks — focus on the 4-week trend, not daily fluctuations.

What Are Refeed Days and Diet Breaks?

After 4–6 weeks of continuous dieting, leptin levels drop, hunger increases, and performance dips. A refeed day (eating at maintenance calories, focused on carbohydrates) or a diet break (1–2 weeks at maintenance) can restore hormonal balance, improve gym performance, and make long-term adherence much easier. This is not cheating — it’s strategic.

Calorie Deficit Tips for the Indian Diet

  • Swap white rice for smaller portions + dal — the fiber and protein combination keeps you full longer.
  • Choose paneer over processed snacks — paneer is high in casein protein and very satiating.
  • Avoid liquid calories — chai with full-fat milk, cold drinks, and packaged juices add 200–400 kcal silently.
  • Walk after meals — a 20-minute post-meal walk significantly improves insulin sensitivity and daily NEAT.
  • Track at least 2 weeks — most people underestimate intake by 20–30%.

Frequently Asked Questions

How many calories should I eat to lose 1 kg per week? +
Since 1 kg of fat equals approximately 7,700 kcal, losing 1 kg per week requires a deficit of ~1,100 kcal per day. For most people, this is quite aggressive and risks muscle loss, fatigue, and hormonal disruption. Most experts recommend targeting 0.5 kg/week (a ~550 kcal/day deficit) for sustainable results without sacrificing muscle mass.
What is the minimum number of calories I should eat per day? +
Eating below 1,200 kcal/day (women) or 1,500 kcal/day (men) is generally considered unsafe without medical supervision. Very low calorie intake leads to nutrient deficiencies, muscle loss, metabolic slowdown, and hormonal disruption. This calculator automatically flags plans that would push you below these floors.
Why did I stop losing weight after 2–3 weeks? (Weight Loss Plateau) +
Weight loss plateaus are caused by metabolic adaptation — as you lose weight, your body requires fewer calories to function, so your original deficit shrinks. Solutions include: (1) Recalculate your TDEE at your new weight, (2) Add 15–20 min of cardio per day, (3) Take a 1-week diet break at maintenance calories, (4) Increase protein intake to 2.4g/kg to further boost thermogenesis.
Can I lose fat and build muscle at the same time? +
Body recomposition (losing fat and gaining muscle simultaneously) is possible, but primarily in beginners, people returning from a long break, or those with high body fat percentages. For intermediate/advanced trainees, the traditional bulk/cut cycle is more efficient. Regardless, high protein intake (2.2–2.4g/kg) and progressive resistance training are non-negotiable during a cut to minimize muscle loss.
How accurate is the calorie deficit calculator? +
The Mifflin-St Jeor equation has a ±10% margin of error, which is the best available for a general-population formula. Individual variation in NEAT (non-exercise activity thermogenesis), gut microbiome, and metabolic efficiency means real-world results may vary. Track your weight for 2–3 weeks, compare to predicted loss, and adjust intake by ±100–200 kcal accordingly.
What are refeed days and should I use them? +
Refeed days involve eating at or near maintenance calories (especially carbohydrates) for 1–2 days per week or every 2 weeks. They temporarily restore leptin levels, reduce cortisol, improve workout performance, and make dieting psychologically sustainable. For a deficit longer than 6 weeks, a full diet break (1–2 weeks at maintenance) is recommended to prevent excessive metabolic adaptation.
Does cardio help create a calorie deficit? +
Yes, cardio increases TDEE. However, it also often increases appetite. Research suggests the most sustainable approach is a moderate dietary deficit (~300–500 kcal/day from food) combined with moderate cardio (20–30 min, 3–4x/week). Avoid excessive cardio during a deficit — it raises cortisol, impairs recovery, and can accelerate muscle loss. Prioritize resistance training to preserve muscle.
How much protein should I eat while cutting? +
Current evidence (from sports nutrition research including work by Eric Helms and the ISSN) recommends 2.2–2.4g of protein per kilogram of body weight during a caloric deficit to maximize muscle retention. For an 80 kg person, that’s 176–192g of protein per day. Distribute this across 3–5 meals for optimal muscle protein synthesis. GainsX Whey Protein provides 25g per scoop to help hit these targets easily.
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