Weight Loss Percentage Calculator

Find out exactly how much weight you have lost, your weight loss percentage, and how close you are to your goal weight.

Starting Weight

Your weight when you started

Current Weight

Your latest weight

Goal Weight Optional

See your progress toward your goal

You've lost 0% of your starting weight

Weight Lost 0

Starting Weight 0

Current Weight 0

Goal Weight —

Weight Loss Progress 0%

Progress Toward Goal 0%

What Is Weight Loss Percentage?

Weight loss percentage tells you how much of your original body weight you have lost. Instead of looking only at the number of kilograms or pounds lost, it puts your progress into perspective based on your starting weight.

How to Calculate Weight Loss Percentage

The weight loss percentage formula is simple:

Weight Loss Percentage =
(Starting Weight − Current Weight) ÷ Starting Weight × 100

For example, if you started at 90 kg and now weigh 82 kg, you have lost 8 kg. Your weight loss percentage is approximately 8.89%.

Why Track Weight Loss Percentage?

Tracking your weight loss percentage can make progress easier to understand because the same amount of weight loss represents a different proportion of body weight for different people. This calculator gives you a quick way to monitor your progress using either kilograms or pounds.

How to Use This Calculator

Select kilograms (kg) or pounds (lb).
Enter your starting weight.
Enter your current weight.
Optionally enter your goal weight.
Click Calculate My Weight Loss.

Weight Loss Percentage Calculator FAQs

How do I calculate my weight loss percentage?

Subtract your current weight from your starting weight, divide the result by your starting weight, and multiply by 100. Our calculator performs this calculation automatically.

What is the weight loss percentage formula?

The formula is: (Starting Weight − Current Weight) ÷ Starting Weight × 100.

Can I calculate weight loss in pounds?

Yes. Select lb at the top of the calculator and enter both your starting and current weights in pounds.

Can I add my goal weight?

Yes. Goal weight is optional. Adding it allows the calculator to show your progress toward your target weight.

What if my current weight is higher than my starting weight?

If your current weight is higher, the calculator identifies the result as a weight increase rather than weight loss.

Is weight loss percentage the same as body fat percentage?

No. Weight loss percentage measures the change in total body weight. Body fat percentage estimates the proportion of your body weight that is fat.

Important: Body weight can naturally change from day to day due to hydration, food intake, sodium, exercise and other factors. For better tracking, compare measurements taken under similar conditions.