Weight Loss Percentage Calculator
Total kilograms lost only tell half the story — percentage of starting weight is how challenges and clinics usually track progress.
Enter your details above and the result will appear here.
How to use
- Enter your starting weight.
- Enter your current weight.
- Your percentage lost and kilograms lost appear instantly.
Note
Percentage lost = (start - current) / start x 100. A loss of 5 to 10 percent of starting weight is the range commonly associated with meaningful health improvements in published guidance. Estimate only — not medical advice.
Frequently Asked Questions (FAQ)
What does this calculator show?
The percentage of starting weight you have lost, plus the kilograms lost between two weigh ins.
What is the formula?
Percentage lost = (start weight - current weight) / start weight x 100.
Why track percentage instead of kilograms?
Percentage of starting weight is how weight loss challenges and clinics usually track progress.
Is this medical advice?
No. It is an estimate only, not medical advice.
Is this calculator free?
Yes. It is free with no signup.