Weight Loss Percentage Calculator
Track progress by comparing your starting weight with your current weight. Understanding the percentage lost helps you evaluate whether your plan is sustainable and aligned with health recommendations.
Enter Your Weights
Switch between metric and imperial units at any time.
Results
Weight change
8.0 kg
Total weight lost
Percentage
8.9%
Progress overview
Significant weight loss. Ensure adequate nutrition and support.
Converted weights
Starting weight: 90.0 kg • Current weight: 82.0 kg
How to Use This Calculator
Collect accurate weights
Weigh under consistent conditions—same scale, time of day, and clothing. Enter the earliest baseline weight and your current reading.
Interpret the percentage
Aim for gradual loss of 0.5–1% of body weight per week. Larger changes may need clinical supervision.
Pair with health metrics
Monitor waist measurements, energy levels, and lab markers to ensure weight loss is healthy and sustainable.
Formula
Weight Loss % = ((Starting − Current) ÷ Starting) × 100
- Positive values indicate weight loss; negative values indicate weight gain.
- Weekly loss of 0.5–1.0 kg (1–2 lb) is typically considered safe for most adults.
- Adjust calorie intake and activity gradually to maintain muscle mass.
Example: Starting weight 90 kg, current weight 82 kg → Loss = 8 kg → Loss % ≈ 8.9%.
Understanding Weight Loss Percentage
Percentage of weight lost contextualizes progress for different starting weights. Clinical guidelines often use 5% and 10% milestones to evaluate improvements in blood pressure, glucose control, and mobility.
Remember that scale changes are only one part of the story. Combine this metric with body composition tests, strength gains, and well-being assessments to evaluate your program holistically.
Frequently Asked Questions
How often should I update the numbers?
Weekly or biweekly updates help you spot trends while avoiding day-to-day fluctuations caused by water or glycogen changes.
Does muscle gain affect the result?
Yes. If you are gaining muscle while losing fat, the scale might move slowly. Track measurements, photos, or body fat tests as well.
Is rapid weight loss safe?
Rapid loss can lead to muscle breakdown and nutrient deficiencies. Always consult a healthcare professional for aggressive strategies.
Can I use this during pregnancy?
No. Pregnancy requires medically supervised weight management. Follow guidance from your obstetric provider.