Weight Loss Percentage Calculator
Percent of body weight lost is a fairer progress measure than pounds alone — losing 10 lb means more at 150 lb than at 300 lb. Enter your starting and current weight (any unit, as long as both match).
- Weight lost
- 8%
- Pounds changed
- 16 lb
- 5% milestone weight
- 190 lb
- 10% milestone weight
- 180 lb
Steps
- (200 − 184) ÷ 200 × 100 = 8%
Worked example
Example: from 200 lb to 184 lb
- Weight lost = 200 − 184 = 16 lb
- 16 ÷ 200 = 0.08
- × 100 = 8%
You've lost 8% of your starting body weight.
Formula
Weight loss % = (Starting − Current) ÷ Starting × 100
Clinical guidelines often treat a 5–10% loss as meaningful for health markers such as blood pressure and blood sugar.
Frequently asked questions
Does it matter if I use pounds or kilograms?
No. The percentage is the same in any unit, as long as both weights use the same one.
What is a healthy rate of weight loss?
Many health organizations suggest about 0.5–1% of body weight (often 1–2 lb) per week. Talk to your doctor for personal advice.
How is this used in weight-loss challenges?
Challenges rank people by percentage lost so that everyone competes fairly regardless of starting weight.
Last reviewed October 17, 2026 · Calculations run in your browser; nothing you enter is sent to a server.