How this weight loss percentage calculator works
The math is simple. We take the weight you've lost and divide it by your starting weight.
Weight loss % = (starting weight − current weight) ÷ starting weight × 100
We round your result to one decimal place. If your current weight is higher than your starting weight, we show the percent you've gained instead.
Here are two quick examples:
- Pounds: 220 lb down to 200 lb is 20 lb lost, or about 9.1%.
- Kilograms: 100 kg down to 92 kg is 8 kg lost, or 8%.
Because it's a ratio, the unit doesn't matter. Just use the same unit for both numbers. If you use stone, enter it as a decimal. For example, 14 st 7 lb is 14.5.
Your milestones
We track three milestones: 5%, 10%, and 15% of your starting weight. After each result, we show your next milestone and the weight you'll be at when you reach it.
The 5% mark matters. The CDC says a 5% loss could lower the risk of some chronic diseases, like heart disease, prediabetes, and type 2 diabetes. For someone who starts at 200 lb (91 kg), that's 10 lb (4.5 kg).
Tips for steady progress
- Go at a steady pace. The CDC says people who lose about 1 to 2 lb (0.5 to 0.9 kg) a week are more likely to keep it off. Our calorie deficit calculator can help you plan a pace that fits.
- Protect your muscle. When you eat less, protein and strength training help you keep muscle so more of what you lose is fat. Our protein calculator sets a daily target.
- Weigh in the same way. Use the same scale, at the same time of day, in similar clothes. Daily weight can bounce around, so look at the trend over weeks.
Losing weight on a GLP-1 medicine?
This calculator is an easy way to follow your progress while you take one. Eating less can make it harder to get enough protein. Read our guide on protein on Ozempic for simple ways to keep it up.
If you are losing weight without trying, or you are pregnant, under 18, or have a history of eating disorders, talk to your doctor or a registered dietitian.