Weight Loss Calculator
Calculate how much weight you can lose over a period based on your daily calorie deficit and other factors.
Published by:
isCalculator Editorial Team
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How to use this tool?
How to Use the Weight Loss Calculator
- Enter your current weight in kilograms (kg). Must be between 20 and 500 kg.
- Enter your target weight in kg. It must be less than your current weight.
- Set your daily calorie deficit (100–2000 kcal). This is how many fewer calories you’ll eat each day.
- Choose a time frame in weeks (1–104 weeks).
- Click Calculate.
What you get:
- If your goal is achievable within the time frame, the calculator shows your estimated weight after that period.
- If not, it tells you the maximum possible weight you can reach and the minimum weeks needed to hit your target.
Note: All inputs are in metric (kg). The calculation assumes 1 kg of body fat ≈ 7700 kcal.
Previous Results
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Frequently Asked Questions
It estimates weight loss based on the calorie deficit you create daily. It uses the fact that 1 kg of body fat is roughly equivalent to 7,700 kcal.
The result is an estimate. Actual weight loss may vary due to factors like metabolism, activity level, and water retention.
A deficit of 500-1000 kcal per day is generally considered safe and leads to a loss of about 0.5-1 kg per week.
