What is a calorie deficit?

A calorie deficit occurs when you consume fewer calories than your body burns (TDEE). A deficit of 7,700 kcal over time leads to ~1 kg of fat loss. This calculator finds the daily deficit needed to hit your goal in your chosen timeframe.

How fast is safe weight loss?

0.5–1 kg per week is considered safe and sustainable. Faster rates risk muscle loss, nutritional deficiencies, and metabolic slowdown. The calculator flags plans that exceed this threshold.

What is the minimum safe daily calorie intake?

Generally 1,200 kcal/day for women and 1,500 kcal/day for men. Going below these without medical supervision can be dangerous.

Should I eat back exercise calories?

Partially. Most TDEE estimates already include exercise. If you've chosen your activity level correctly in the TDEE calculator, you don't need to eat back all exercise calories.

What happens if my calorie deficit is too aggressive?

A deficit larger than 1,000 kcal/day typically causes muscle loss, hormonal disruption, fatigue, and metabolic adaptation (your TDEE decreases). Stick to a maximum deficit of 500–750 kcal/day for sustainable fat loss.

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Calorie Deficit Calculator

Find your daily calorie target to reach your goal weight in a set timeframe. Safe, science-backed calorie planning.

Current Weight (kg)

30 kg200 kg

Goal Weight (kg)

30 kg200 kg

Daily TDEE (kcal)

1,200 kcal5,000 kcal

Timeframe (Weeks)

1 wks104 wks

Weight to Lose

10 kg

Daily Calories

1,283 kcal

Daily Deficit

917 kcal

Per Week

0.83 kg

Weight Loss Timeline

Week	Expected Weight	Progress
Start	80 kg	0%
Week 2	78.3 kg	17%
Week 4	76.7 kg	33%
Week 6	75 kg	50%
Week 8	73.3 kg	67%
Week 10	71.7 kg	83%
Week 12	70 kg	100%

1 kg of fat ≈ 7,700 kcal. Use the TDEE Calculator to find your maintenance calories. Safe weight loss is 0.5–1 kg per week.

About the Calorie Deficit Calculator

A calorie deficit means burning more calories than you consume - it is the only proven way to lose body fat. 1 kg of body fat contains approximately 7,700 calories. To lose 1 kg per month, you need a deficit of ~250 calories per day. This calculator helps you find the right calorie target based on your TDEE and weight loss goal, without compromising your nutrition or metabolism.

Calorie Deficit for Fat Loss

Daily Calorie Target = TDEE − Deficit · Deficit for 0.5 kg/week = −500 kcal/day · Deficit for 1 kg/week = −1,000 kcal/day

1 kg fat ≈ 7,700 kcal · Safe max deficit: 500–750 kcal/day · Never go below 1,200 kcal/day (women) or 1,500 kcal/day (men)

Worked Example

28-year-old female, 65 kg, 160 cm, lightly active - wants to lose 5 kg

TDEE:≈ 1,900 kcal/day

Goal:Lose 0.5 kg/week

Deficit:500 kcal/day

Daily calorie target ≈ 1,400 kcal · Protein target ≈ 104g/day (1.6g/kg body weight) · Timeline to lose 5 kg ≈ 10 weeks

Tips & Insights

1
Prioritize protein at 1.6–2.0g per kg of body weight - it preserves muscle mass while losing fat.
2
Tracking food accurately for even 2 weeks dramatically improves your awareness of what you're actually eating.
3
Indian diets high in rice, roti, and fried snacks are easy to overconsume - portion control is key.
4
Strength training while in a deficit prevents muscle loss and improves body composition.
5
Avoid extreme deficits during festivals and travel - a smaller, consistent deficit beats a severe-but-inconsistent one.

Why this matters for you

Fad diets and crash programs are ubiquitous in India's health market - but fat loss ultimately comes down to a sustained calorie deficit over time. Understanding the numbers removes the guesswork, prevents extreme diets, and gives you a sustainable plan based on your own body's energy needs.