Calculate the percentage of body weight lost between two measurements and see how your progress compares to clinical significance thresholds.
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Units
5.6%
% lost
5.0 kg
Lost
85 kg
Current
| Target | Goal weight (kg) | Still to lose (kg) |
|---|---|---|
| 5% of start | 85.5 | ✓ Achieved |
| 10% of start | 81 | 4.0 |
Also in Body Metrics
Health & Body Composition
Tracking weight loss as a percentage of starting weight — rather than absolute kilograms or pounds — places progress in context and aligns with clinical research on the health benefits of weight reduction. A 5–10% loss of body weight is consistently associated with improvements in cardiometabolic risk factors regardless of starting weight.
A 5 kg loss means something very different for a person starting at 70 kg versus 150 kg. Expressing loss as a percentage of starting weight normalises progress across body sizes and matches the thresholds used in clinical weight management research. The 5% threshold is where improvements in blood pressure, blood glucose, and cholesterol typically become measurable.
The 5–10% band is labelled clinically meaningful because this is the range most consistently linked to metabolic health improvements in the research literature. Losses of 10–20% represent substantial change; losses above 20% are major and require close attention to nutritional adequacy and muscle mass preservation.
Frequently asked questions
Weight gain can reflect fat gain, muscle gain, or both. The calculator reports the percentage change without making a judgment about the nature of the change. If you are in a deliberate muscle-building phase, weight gain is expected and positive.
Daily weight fluctuates by 1–3 kg due to hydration, food volume, and glycogen. Weekly averages or consistent measurement conditions (same time of day, same clothing, same scale) give a more accurate picture of true fat loss progress.
Related
These related calculators come from the same leaf category, nearby sibling categories, or the same top-level topic.
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See ideal body weight estimates from four classic medical formulas (Hamwi, Devine, Robinson, Miller) based on your height and sex.
