Calorie Deficit Calculator for Indian Adults
A physician-built calculator for Indian body composition. Get your BMR, TDEE, target kilocalories and a 12-week weight projection in seconds.
Calculator result
| Week | Projected weight (kg) |
|---|---|
| 0 | 75 |
| 1 | 74.6 |
| 2 | 74.1 |
| 3 | 73.7 |
| 4 | 73.3 |
| 5 | 72.9 |
| 6 | 72.4 |
| 7 | 72 |
| 8 | 71.6 |
| 9 | 71.1 |
| 10 | 70.7 |
| 11 | 70.3 |
| 12 | 69.9 |
- Your calculated target was below 1,500 kcal/day. We have raised it to 1,500 kcal/day for safety.
Want a physician to translate this into a weekly meal plan? Book a DermaVue medical weight loss consultation.
Book a ConsultationHow This Calculator Works
Enter your age, your sex assigned at birth, your height in centimetres and your weight in kilograms. Choose the activity level that honestly describes your average week. Pick a deficit level. The calculator returns four numbers: your basal metabolic rate, your total daily energy expenditure, your target daily kilocalories and your daily protein floor. Below those numbers it plots a 12-week weight projection at the chosen deficit. Change any input and the result updates immediately.
A note on honesty. Most patients overestimate their activity level. If you sit at a desk all day and walk for 30 minutes in the evening, you are sedentary, not lightly active. Pick one level lower than you instinctively want to.
What Your Number Actually Means
BMR
Your basal metabolic rate is the energy your body burns at complete rest, just to keep your heart beating, your brain firing, your kidneys filtering and your temperature stable. For a 35-year-old man weighing 80 kg at 170 cm, BMR is around 1,690 kilocalories per day. For a 35-year-old woman weighing 65 kg at 158 cm, BMR is around 1,360 kilocalories per day. We use the Mifflin-St Jeor equation, which is the most accurate published estimator for adults of normal and overweight body composition.
TDEE
Your total daily energy expenditure is BMR multiplied by an activity factor. Sedentary work plus minimal movement is 1.2. Light activity (one walk a day or one gym session twice a week) is 1.375. Moderate activity (45 to 60 minutes of dedicated exercise four to five days a week) is 1.55. High activity (daily intense training or physically demanding manual work) is 1.725. Very high (athletes in heavy training blocks) is 1.9. TDEE is your maintenance number. Eat that and your weight will not change over time.
Target kcal
Subtracting a deficit from TDEE gives your target daily intake. We default to a 25 percent deficit because it produces meaningful weekly weight loss without crashing energy, sleep or thyroid output. A 15 percent gentle deficit is appropriate for patients with low starting weight, athletes preserving performance, or anyone in a long maintenance phase. A 30 percent aggressive deficit is appropriate for patients with high starting BMI under direct physician supervision. We do not allow the calculator to recommend below 1,200 kilocalories for women or 1,500 for men, regardless of the deficit chosen, because intake below those floors is associated with lean mass loss, hair shedding, hormonal disruption and rebound weight gain.
Protein floor
The calculator gives a protein floor at 1.2 g/kg current body weight and a protein ceiling at 1.6 g/kg. For an 80 kg adult that is 96 to 128 grams of protein per day. Hit the floor every day. Cross the ceiling on training days if you can.
Weekly and 12-week projection
A pure 7,700 kilocalorie deficit produces approximately 1 kg of body fat loss. The calculator divides your weekly deficit by 7,700 to project weekly fat loss, then extrapolates over 12 weeks. Reality is messier. The first week often shows 1.5 to 2 kilograms because of glycogen and water shifts. Months two and three settle into a steadier curve. Patients on GLP-1 therapy frequently exceed the projection by 30 to 60 percent because the medication amplifies the deficit through appetite reduction and metabolic effects.
Safety Limits Built Into This Tool
The calculator hard-stops in three situations. If your BMI is below 18.5, no deficit is computed because a calorie deficit is not clinically appropriate at that weight. If you tick the pregnancy or breastfeeding box, no deficit is computed because pregnancy and lactation require an energy surplus. If your age falls outside 18 to 80, no deficit is computed because the equation is validated for that range only. The calculator also raises a soft warning if your BMI is 40 or above, asking you to seek physician supervision before acting on any number.
How DermaVue Physicians Use This in Consultation
We do not hand the patient a number and send them home. The calculator is the start of the conversation, not the end. In consultation we look at the target intake, then translate it into food the patient already eats. A 500 kilocalorie deficit for a Kerala patient is roughly one Kerala parotta less per day, or two medium idlis less, or one samosa less, or three teaspoons of sugar in coffee removed across the day. We make the trade explicit so the patient can choose which habit changes.
We also pair the calorie target with the protein target, because patients who chase only the calorie number lose disproportionate muscle. Calories without protein is dieting in the bad sense. Calories with protein is body recomposition.
The Limits of Any Calorie Calculator
Three honest caveats.
First, BMR equations are estimates. Mifflin-St Jeor has a standard error of around 8 to 10 percent. Your real BMR could be 150 kilocalories above or below the predicted value. The way to know is indirect calorimetry, which we offer in clinic for selected patients.
Second, TDEE is not constant. The body adapts to a sustained deficit by reducing non-exercise activity, lowering thyroid output and trimming the cost of every movement. This is metabolic adaptation, and it is the main reason weight loss slows after week six to eight on a fixed intake.
Third, calories matter, but so does food quality. 1,500 kilocalories of paneer, fish, dal, vegetables and red rice produces different body composition outcomes than 1,500 kilocalories of biscuits, parotta and sweet lassi. The calculator does not see food quality. You and your physician do.
Calorie Deficit Questions
What is a calorie deficit?
A calorie deficit is the gap between the energy you eat and the energy you burn. If your body needs 2,200 kilocalories to maintain weight and you eat 1,700, you are in a 500 kilocalorie deficit. Sustained over a week that is roughly 3,500 kilocalories, which translates into approximately 0.45 kilograms of fat loss.
How many calories should I eat to lose weight?
For most Indian adults with a BMI between 27 and 35, the right number sits between 1,400 and 1,800 kilocalories per day. The exact figure depends on your sex, height, weight and activity. Use the calculator above for a personalised target. Do not eat below 1,200 (women) or 1,500 (men) without physician supervision.
Is a 1,000 kilocalorie deficit too aggressive?
For most patients, yes. A 1,000 kilocalorie daily deficit drops intake into a range that is hard to sustain, harder to hit protein targets within, and associated with fatigue, hair shedding and rebound weight gain. We allow it only for selected patients with very high starting BMI under direct supervision and with structured protein scaffolding.
How fast can I lose weight on a calorie deficit?
Sustainable fat loss is 0.5 to 0.75 kilograms per week. Patients on GLP-1 therapy may temporarily exceed that during the first two to three months because the medication amplifies the deficit. Anything above 1 kilogram per week sustained over many weeks usually means significant lean mass loss, not just fat loss.
Do I need to count every calorie?
No. We prefer portion-based eating for the first 8 to 12 weeks. Calorie counting becomes useful when weight loss stalls, when a patient wants precision, or when food quality is hard to estimate. The calculator gives you the target. A simple plate model usually delivers it.
Can I eat in a deficit and still gain muscle?
Yes, in two specific situations. New trainees who have never lifted weights can build muscle in a deficit for the first six to nine months. Patients restarting training after a long break can also recomposition. Established trainees usually need a small surplus to build new muscle, but they can preserve every gram they have if protein is high and resistance training is consistent.
What is the difference between BMR and TDEE?
BMR is the energy your body burns at complete rest. TDEE is BMR plus everything you do during the day, including walking, fidgeting, working and exercising. TDEE is the number you need to undercut to lose weight. BMR is the floor below which you should not eat.
Why do you cap the minimum at 1,200 and 1,500 kilocalories?
Because below those floors the risk of lean mass loss, micronutrient deficiency, hair shedding, menstrual disruption and rebound weight gain rises sharply, and the marginal weight loss benefit is small. Conservative international clinical practice uses these floors. We follow them.
Does the calculator account for GLP-1 medications?
The calculator gives you a baseline target. If you are on semaglutide or tirzepatide, you do not need to manually create a larger deficit. The medication will reduce appetite naturally. Eat to the target the calculator gives you, not below. Patients on GLP-1 therapy who undereat below the target develop nausea, fatigue and muscle loss.
Can I use this calculator if I am pregnant or breastfeeding?
No. Pregnancy and lactation require energy surplus, not deficit. This calculator should not be used by pregnant or breastfeeding women.
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Want a Physician to Translate This Number Into a Plan?
Book a DermaVue medical weight loss consultation. We pair the calorie target with a protein scaffold, a meal plan in food you already eat, and GLP-1 therapy where indicated.