Calories & Nutrition tool
Weight Loss Date Calculator
See the date you could reach a goal weight from your daily calorie deficit, and how fast that is a week. Works for weight gain too. Free, nothing stored.
Nothing you enter leaves your device.
Inputs
Results
Enter values to see your results.
Simple steps
How it works
- 01
Enter your current weight and your goal weight.
- 02
Enter how many calories a day you plan to eat below (or above) your maintenance.
- 03
Select Calculate to see the date, the number of days and the weekly rate.
Good to know
Frequently asked questions
How is the date worked out?
About 7,700 kcal equals 1 kg of body weight. The difference between your weights is multiplied by 7,700 and divided by your daily calorie gap.
What daily deficit should I choose?
Around 500 kcal a day gives about 0.5 kg a week, a pace often recommended. Use our calorie calculator to find your maintenance calories first.
Will I really reach it on that date?
Probably not exactly. Weight loss usually slows as you get lighter, and water weight changes from day to day. Treat the date as a guide.
Why is the deficit capped at 1,000 kcal?
Larger deficits make it hard to get enough nutrients and are not advised without medical supervision.
Does it work for gaining weight?
Yes. Enter a goal above your current weight and the daily surplus you plan.
Is anything I enter stored or sent?
No. The calculation runs in your browser. Nothing you type is saved or sent to a server.
How it is calculated
Days = |current weight − goal weight| × 7,700 kcal ÷ daily calorie gap, rounded up; weekly rate = gap × 7 ÷ 7,700 kg. The 7,700 kcal per kg rule is a simplification; real change slows over time (Hall and colleagues, 2011).
Sources
- National Institute of Diabetes and Digestive and Kidney Diseases. Body Weight Planner
- Hall KD et al. Quantification of the effect of energy imbalance on bodyweight. Lancet 2011;378:826–37
Last reviewed: October 14, 2026