Work out weight loss percentage instantly with clear inputs, formula shown and shareable results.
Percentage weight loss is the standard clinical measure because it scales with body size: 9 kg from 95 kg is 9.5%, which matters more than the absolute figure. A 5% loss already improves blood pressure and insulin sensitivity, and 10% is the usual target in obesity management guidelines.
Percentage lost
percent = (start - current) / start x 100
Clinical milestones
5% meaningful, 10% target, 15% substantial
These figures are population-average estimates, not a medical assessment or diagnosis. Body composition equations carry errors of several percentage points, and healthy ranges vary with age, ethnicity, muscularity and medical history. Discuss weight or body composition goals with a qualified clinician or dietitian.
Because 5 kg means something very different at 60 kg than at 150 kg. Percentage makes outcomes comparable and matches how trials report results.
About 0.5-1% of body weight a week. Faster rates increase lean mass loss and are harder to sustain.