How Much Weight Have I Lost Calculator guide
How Much Weight Have I Lost Calculator: Track Your Progress
Use our How Much Weight Have I Lost Calculator to see your weight loss in stone, pounds or kilograms, as a percentage, per week and towards your goal.
By the AllCalculator editorial teamUpdated 15 October 20262 min read
Watching the scales go down is motivating, but the raw number doesn't tell the whole story. Our How Much Weight Have I Lost Calculator shows how much you've lost, what percentage of your starting weight that is, your weekly average and how close you are to your goal.
Why percentage matters
Losing a stone means more to someone who started at 12 stone than someone who started at 20. Percentage of body weight puts everyone on the same scale:
Percentage lost = weight lost ÷ starting weight × 100
The NHS notes that losing just 5% of your body weight can bring real health benefits, such as lower blood pressure and a lower risk of type 2 diabetes.
A healthy rate of loss
The NHS suggests aiming to lose about 0.5kg to 1kg (1lb to 2lb) a week. Losing weight faster than that is harder to keep up and more likely to come back.
How to use the calculator (How Much Weight Have I Lost Calculator)
- Choose stone and pounds or kilograms.
- Enter your starting weight and current weight.
- Optionally, enter your goal weight and how many weeks it's been.
You'll see how much you've lost, the percentage of your starting weight, your average a week, and how much is left to reach your goal.
A worked example
With the calculator's default settings, you started at 15 stone and now weigh 13 stone 12 pounds, 8 weeks later:
- Weight lost: 1 stone 2 pounds (about 7.3kg)
- That's 7.6% of your starting weight
- An average of about 2 pounds a week
Tips for tracking
- Weigh yourself at the same time, ideally first thing in the morning, once a week.
- Look at the trend. Your weight can swing by a pound or two from day to day because of water and food.
- Track more than weight. Waist size, energy and how your clothes fit all show progress.
Check where you are with our BMI Calculator, set a daily target with our Calorie Calculator, and see how much to drink with our Water Intake Calculator.
Frequently asked questions
How do I work out my weight loss percentage?
Subtract your current weight from your starting weight, divide by your starting weight and multiply by 100.
How much weight is 5%?
5% of your starting weight. For someone who started at 15 stone, that's 10.5 pounds.
Why have I stopped losing weight?
Plateaus are normal. As you lose weight, your body needs fewer calories, so you may need to adjust what you eat or how active you are. Speak to your GP if you're worried.
Every pound counts. Track your progress with the How Much Weight Have I Lost Calculator and celebrate the milestones along the way.
Sources and further reading
Links open official and independent websites in a new tab.
This guide is general information to help you understand your options. It isn't financial, tax, legal or building advice and doesn't take your personal circumstances into account. Figures were checked when the guide was last updated and can change, so confirm anything important with GOV.UK, HMRC, a regulated adviser or a qualified tradesperson.