Free weight-loss tool
How Long to Lose Weight Calculator
Tell it how much you want to lose and how fast, and it shows how many weeks and months that takes. It needs no details about you, only the two numbers.
Worked example
Losing 10 kg at 0.5 kg a week takes 20 weeks, about 4.6 months.
Work out how long it will take
The result below starts from the example's numbers. Change any field and it updates as you type.
Track this target every day
Use the number above as your daily goal in CalorTracker, then log meals by photo, voice or text and see where your day stands against it. Free to start, no card needed to explore.
Results are estimates from published formulas, not medical advice. Your own body can sit above or below them.
Where the formulas come from, and how we check them: how we calculate.
The arithmetic
Weeks = weight to lose ÷ weight lost per week, rounded up to the next whole week. Months = weeks × 7 ÷ 30.44, the average length of a month. Losing 10 kg at 0.5 kg a week is 20 weeks, about 4.6 months.
Choosing a pace
The CDC describes about 1 to 2 pounds (0.5 to 0.9 kg) a week as steady weight loss, and this calculator accepts a pace up to 1 kg (2.2 lb) a week. The table beside your answer shows the same loss at four paces so you can see what going a little faster or slower does to the date.
What it leaves out
A straight line is the best case. Weight moves up and down from day to day, and loss usually slows as you get lighter, because a smaller body burns less. For a daily calorie target to match a pace, use the calorie deficit calculator or work from a date with the weight loss calculator.