By Balveer Singh Rathore, Editor · Last updated: September 26, 2026 · How we write
A calorie deficit means eating fewer calories than your body burns, so it uses stored fat for energy. To calculate yours, estimate your daily calorie needs (BMR × activity level) and eat about 300–500 kcal less. Weight loss slows over time, so the old “3,500 kcal = 1 pound” rule isn’t accurate for long-term planning.
This article is general information, not medical advice. If you have a health condition, are pregnant or take medication, talk to your doctor before changing your diet, exercise or supplements. Read our disclaimer.
What is a calorie deficit?
Your body burns energy for basic functions (breathing, heartbeat, digestion) and for activity. If you eat less energy than you burn, the gap is a calorie deficit, and your body makes up the difference from stored fat and other tissues. In Hindi, it’s often explained as “jitna kharch, usse kam khana”: eat a bit less than you spend.
How to calculate your calorie deficit (3 steps)
Step 1: Estimate your BMR
Basal metabolic rate (BMR) is the energy you burn at rest. The Mifflin-St Jeor equation is a widely used estimate:
- Men: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age (years) + 5
- Women: BMR = 10 × weight (kg) + 6.25 × height (cm) − 5 × age (years) − 161
Step 2: Multiply by your activity level
| Activity level | Multiply BMR by |
|---|---|
| Sedentary (desk job, little exercise) | 1.2 |
| Lightly active (exercise 1–3 days a week) | 1.375 |
| Moderately active (exercise 3–5 days a week) | 1.55 |
| Very active (hard exercise 6–7 days a week) | 1.725 |
The result is your estimated total daily energy expenditure (TDEE), the calories you need to keep your weight the same.
Step 3: Subtract 300–500 kcal
A deficit of about 300–500 kcal a day is a sensible, sustainable starting point for most adults. Larger deficits cause faster early loss but are harder to stick to and can cost more muscle.
Calorie deficit examples
| Person | BMR | TDEE (lightly active) | Target with 500 kcal deficit |
|---|---|---|---|
| Woman, 30 years, 160 cm, 70 kg | about 1,390 kcal | about 1,910 kcal | about 1,410 kcal |
| Man, 35 years, 172 cm, 80 kg | about 1,705 kcal | about 2,345 kcal | about 1,845 kcal |
These are estimates. Track your weight and waist for 2–3 weeks and adjust by 100–200 kcal if nothing changes.
How fast will you lose weight?
The old rule that a 3,500 kcal deficit equals one pound (about 0.45 kg) of fat works only roughly in the short term. As you lose weight, your body burns fewer calories, so progress slows. The U.S. National Institutes of Health’s free Body Weight Planner uses a more accurate model and can show you a realistic timeline.
What a 1,400–1,800 kcal Indian day can look like
| Meal | Example |
|---|---|
| Breakfast | 2 besan or moong chillas with curd |
| Mid-morning | 1 fruit |
| Lunch | 2 rotis, 1 katori dal, sabzi, salad |
| Evening | Tea with less sugar + roasted chana |
| Dinner | Paneer, tofu, egg or chicken with vegetables and 1 roti |
Portions decide the total. For full plans, see our 7-day Indian diet plan for weight loss and high protein Indian diet plan.
Tips to stay in a calorie deficit without feeling starved
- Eat protein at every meal; it keeps you full longer.
- Fill half your plate with vegetables and salad.
- Cut liquid calories: sugary chai, juices, cold drinks and alcohol.
- Measure cooking oil with a spoon.
- Walk more every day; it adds to your deficit. See our walking for weight loss guide.
- Sleep 7 or more hours; poor sleep increases hunger.
Common calorie deficit mistakes
- Cutting too hard: very low-calorie diets are hard to sustain and should be medically supervised.
- Forgetting protein and strength training: you may lose muscle along with fat. See our beginner gym plan or home workout plan.
- Not counting snacks and drinks: small extras add up quickly.
- Expecting a straight line: weight goes up and down daily because of water and salt. Look at the weekly trend.
Who should get medical advice first: people with diabetes (especially on insulin or tablets that lower sugar), pregnant or breastfeeding women, teenagers, and anyone with a history of eating disorders.
Frequently asked questions
What is a calorie deficit?
A calorie deficit means eating fewer calories than your body burns in a day. Your body then uses stored energy, mostly fat, to make up the difference. It’s the basic principle behind every weight loss diet, whether it’s intermittent fasting, low-carb or a simple portion-controlled Indian diet.
How do I calculate my calorie deficit?
First estimate your BMR with the Mifflin-St Jeor equation, then multiply it by your activity level (1.2 to 1.725) to get your daily needs. Subtract about 300–500 kcal to get your target. Check your progress for 2–3 weeks and adjust if needed.
How much calorie deficit is safe?
For most adults, a deficit of about 300–500 kcal a day is safe and sustainable. Very low-calorie diets should only be followed with medical supervision. Pregnant women, teenagers and people with diabetes or eating disorders should get medical advice before cutting calories.
How much weight can I lose in a month with a calorie deficit?
It depends on your size, deficit and activity. Many people lose around 1–3 kg in the first month with a moderate deficit, partly water. Loss slows over time as your body burns less. The NIH Body Weight Planner can estimate a personal timeline.
Can I lose weight without counting calories?
Yes. Many people create a deficit by using smaller plates, eating more vegetables and protein, cutting sugary drinks and snacks, and walking more. Counting helps you learn portions, but it isn’t the only way. The key is eating a bit less than you burn, consistently.
Why am I not losing weight in a calorie deficit?
You may be eating more than you think, especially oil, snacks and drinks, or your estimate may be too high. Water retention can also hide fat loss for a week or two. Track portions carefully for 2 weeks, check your waist size, and reduce by 100–200 kcal if needed.