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Enter your starting and current weight and instantly get your weight loss percentage.
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This weight loss percentage calculator shows how much weight you have lost (or gained) compared to your starting weight. Instead of only showing the weight difference, it calculates the percentage change, making it easier to track and understand your progress.
Weight loss percentage shows how much weight you have lost compared to your starting weight. It is calculated by dividing the weight lost by the initial weight and multiplying by 100
The formula to calculate weight loss percentage is:
Weight Loss (%) = [(Initial Weight - Current Weight) / Initial Weight] × 100
Want a detailed breakdown of your progress? See exactly how much weight you have lost with our best weight loss calculator.
✔️ It shows the real progress relative to your starting weight
✔️ Shows a more accurate measure than pounds or kilograms alone
✔️ Allows you to perform a fair comparison between individuals with different body sizes
✔️ Helps set realistic and achievable goals (e.g., 5–10% weight loss)
✔️ Keeps you motivated by highlighting meaningful progress
✔️ Widely used in Weight Management and Nutrition
✔️ Helps track long-term consistency and improvements
You can also use the Body Mass Index (BMI) Calculator to evaluate your overall health and check whether your weight is within a healthy range or not.
Given:
Step 1: Find weight lost
Weight Lost = Starting Weight − Current Weight
= 90 − 80 = 10 kg
Step 2: Apply the formula
Weight Loss % = (Weight Lost ÷ Starting Weight) × 100
= (10 ÷ 90) × 100
Step 3: Calculate result
= 0.111 × 100 = 11.1%
Final Answer: You have lost 11.1% of your body weight
Follow these steps to accurately use the body weight loss percentage calculator:
Inputs:
Note: You can enter your weight in either lbs or kg.
Outputs:
For a more detailed health check, use the ideal body weight calculator to find the weight range that best suits your height and age.
Yes, 5% weight loss is considered very beneficial for health.
Benefits of 5% weight loss:
It approximately takes 8 to 20 weeks. This timeline varies from person to person based on lifestyle, diet and consistency.
Factors that affect how fast you lose 10%:
Losing 0.5–1% of body weight per week is considered safe according to the CDC (Centers for Disease Control and Prevention). How long it takes to lose 10% of your body weight depends on your plan. Losing weight slowly and steadily is safer and helps you keep the results for a long time.
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