Weight Loss Calculator
See how long reaching your target weight could take at a chosen weekly rate, and the daily deficit behind it.
Enter your details below.
How to use
- Enter your current weight and your target weight.
- Enter how many kilograms per week you aim to lose.
- Read the estimated weeks and the daily calorie deficit.
About this tool
This tool takes the gap between your current and target weight and divides it by your planned weekly loss rate to estimate the number of weeks needed. It also converts that rate into a daily calorie deficit, using the rough rule that one kilogram of body fat stores about 7,700 calories. The result is general information only, not medical advice, and real loss is rarely perfectly steady week to week.
Frequently asked questions
What is a safe weekly rate?
A commonly suggested pace is around 0.5 kg per week; faster rates are harder to sustain and more likely to cost muscle as well as fat.
Why is the deficit only an estimate?
The 7,700-calories-per-kilogram rule is an average, and your body's burn changes as you lose weight, so treat the timeline as a guide.