Starting weight field?
Use the main weight input as your starting (higher) weight.
Weight Loss Percentage Calculator
See what percent of your starting weight you have lost—a simple progress metric.
Weight loss percentage
Enter your starting weight and current weight.
About this calculator
How to use Weight Loss Percentage Calculator, plus the formulas and logic behind the results.
Tool description
Percent weight lost normalizes progress across different starting sizes—losing 5 kg means more for a lighter person than a heavier one in relative terms.
How to use
- Enter starting weight as your main weight field.
- Enter today's current weight.
- Calculate percent lost and absolute kg/lb change.
- Track over time for motivation beyond the scale alone.
Formulas & reference
% lost = (starting − current) ÷ starting × 100Absolute loss = starting − current
Context
- 5% loss can improve some health markers in higher-risk groups
- 10%+ loss is a common clinical milestone
- Day-to-day scale noise is normal—use weekly averages
Calculation logic
Starting weight comes from the primary weight field; current weight uses the separate current field. Percent is relative to starting weight.
If current weight exceeds starting weight, use the Weight Gain Calculator instead.
Weight Loss Percentage Calculator FAQ
Common questions about this calculator and how to use the results.
Gained instead of lost?
The tool will ask you to use the gain calculator if current is above start.
Muscle gain while losing fat?
Scale weight may not tell the full story—body composition tests add context.
Percent vs pounds?
Percent helps compare progress between people of different sizes.
Water weight?
Sudden drops may be water; trend over weeks for fat loss.
Clinical milestones?
Some guidelines reference 5%, 10%, or 15% loss—this tool shows your current percent.