Weight Loss Calculator

How long weight loss will take at your calorie deficit, with a week-by-week projection and goal date.

Enter values

Result

Time to goal

26 weeks

Goal date: Friday, March 26, 2027
Weekly loss: 0.45 kg
Total to lose: 12 kg

Projected weight by week

Week	Weight (kg)
1	89.5
2	89.1
3	88.6
4	88.2
5	87.7
6	87.3
7	86.8
8	86.4
9	85.9
10	85.5
11	85
12	84.5
13	84.1
14	83.6
15	83.2
16	82.7
17	82.3
18	81.8
19	81.4
20	80.9
21	80.5
22	80
23	79.5
24	79.1
25	78.6
26	78.2
27	78

Educational estimate only — not medical advice. Talk to a healthcare professional about your individual situation. Real weight loss is not perfectly linear — water weight and adaptation cause fluctuations.

About the Weight Loss Calculator

How long weight loss will take at your calorie deficit, with a week-by-week projection and goal date.

Also known as: how long to lose weight, weight loss timeline, weight loss planner, lose weight calculator.

How to use this calculator

Enter units, daily calorie deficit, starting date and the other fields.
The result updates instantly as you type — press Calculate (or Enter) at any time.
Review the breakdown shown under the main result.
Use Copy result or Share to save the answer or send a link with your inputs.

Formula

Days = kg to lose × 7,700 ÷ daily deficit

Worked example

Using the values pre-filled in the calculator above:

Units: Metric (kg, cm)
Current weight = 90 kg
Goal weight = 78 kg
Daily calorie deficit = 500 kcal
Starting date: 2026-09-22

the calculator returns:

Time to goal: 26 weeks
Goal date: Friday, March 26, 2027
Weekly loss: 0.45 kg
Total to lose: 12 kg