Target weight date
Pick a steady pace and see roughly when you would get there. We never set dates for weights below the healthy range for your height.
Your details
For adults. Not for use in pregnancy.
At this pace you would get there around
18 January 2027
About 13 weeks at 1.1 lb a week
- Changedown 1 st 0 lb
- BMI at that weight27.1
- Pace1.1 lb a week
- Daily change in food that starts at this paceabout 550 kcal a day less
- If you keep that same daily change (Hall model)about 19 weeks, around 27 February 2027
- Expected change after 26 weeks of that (Hall model)down 1 st 5 lb
- Model personalised withyour details
Real life is lumpy: holidays, birthdays and water weight all wobble the line. If you get there a few weeks later, you have still got there.
Two answers
A steady pace, and a steady habit
The first date assumes the pace holds every week. In real bodies it does not: as you get lighter you burn a little less, so the same daily change in food brings a slower loss over time. For the 13 st to 12 st example, 0.5 kg a week starts with about 550 kcal a day less (0.5 × 7,700 ÷ 7). Kept at 550, the Hall 2011 model of fat and lean tissue puts the goal at about 18 weeks rather than 13. Neither is a promise; they are two ends of a range. Adding your age and sex makes the model fit you better.
The working
Distance divided by speed
From 13 st (82.6 kg) to 12 st (76.2 kg) is 6.4 kg. At 0.5 kg a week that is 12.7 weeks, so about 13 weeks, or three months. We count the weeks from today and give you the date.
Built in
The safety rules
- No date if the weight you have in mind is below BMI 18.5 for your height.
- Paces stop at 1 kg a week, the top of the NHS range.
- If you are gaining, the pace is capped at 0.5 kg a week.
Real life
Why your date will move
Holidays, illness and water weight wobble the line. Most people get there later than their first date and that is fine. Some find a goal changes once they get going: feeling fitter often matters more than the number.
Questions
Common questions
Why are there two different dates?
The first keeps the pace fixed. The second keeps the daily change in food fixed and lets your body adapt, using a published model from the Lancet (Hall 2011). Most people land somewhere between the two.
How long will it take to lose a stone?
A stone is 6.35 kg. At 0.5 kg a week that is about 13 weeks, and at 1 kg a week about 6 to 7 weeks.
Why will it not give me a date?
If the weight you typed is below the healthy range for your height, we will not set a date, because getting there could harm your health.
Should I set a target weight at all?
Some people find a target helpful and some find it stressful. A 5% loss, or a habit goal like a daily walk, works just as well.
Sources
- NHS: lose weight (0.5 to 1 kg a week)
- NHS: BMI healthy range
- Hall KD et al. Quantification of the effect of energy imbalance on bodyweight. Lancet 2011
Last checked 21 October 2026. Spotted something wrong? Tell us and we will fix it.
If your weight is on your mind
Talk to your GP if your weight has changed a lot without trying, or if it is worrying you. If food or your body feels hard to think about, Beat has a free helpline on 0808 801 0677 (England, weekdays 3pm to 8pm).
Related
Related calculators
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- Healthy weight calculatorThe healthy weight range for your height, in stone or kilos.Open
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