Percentage Weight Lost Calculator
Percent change between starting and current weight.
Enter your values
ⓘ Live results
Results
- Weight lost
- 7 kg
- Percent lost
- 7.4%
- Percent of starting remaining
- 92.6%
Quick answer
Percent weight lost is the weight change divided by starting weight, times 100.
% lost = (start - current) / start x 100
How to use the Percentage Weight Lost Calculator
- 1Enter your starting and current weight in the same units.
- 2The percentage is based on the starting weight, matching how most clinical trials report weight loss.
- 35-10% loss is often the threshold used to define clinically meaningful weight loss.
Worked example
Using the values the calculator loads with:
Inputs
- Starting weight95 kg
- Current weight88 kg
Results
- Weight lost7 kg
- Percent lost7.4%
- Percent of starting remaining92.6%
Frequently asked questions
Why not just use kg lost?
Percentage lets you compare progress fairly regardless of starting body size.
What counts as significant?
Many studies use 5% as the threshold for meaningful health benefit.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.