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Weight Loss Percentage Calculator

Calculate your percent weight lost, weekly rate, distance to goal, and BMI change. Works in pounds or kilograms. Educational only.

Your weights

Used to compute your weekly rate.

Enter a starting and current weight to see your percent change.

Educational only, not medical advice. Talk to a clinician or registered dietitian before starting or adjusting a weight-loss plan, especially if you take medication, are pregnant, or have a history of disordered eating.

Weight Change Percentage Examples

Percent change uses starting weight as the denominator.

Starting weightCurrent weightChangePercent change
200 lb190 lb10 lb loss5.0% loss
180 lb171 lb9 lb loss5.0% loss
150 lb156 lb6 lb gain4.0% gain
250 lb225 lb25 lb loss10.0% loss
120 lb126 lb6 lb gain5.0% gain

The calculator flags loss faster than 2 lb per week. Weight trends need context from nutrition, activity, medications, and health history.

Frequently Asked Questions about the Weight Loss Percentage Calculator

How do you calculate weight loss percentage?
Subtract your current weight from your starting weight, divide by your starting weight, then multiply by 100. A drop from 200 lb to 180 lb is (200 - 180) / 200 x 100 = 10 percent.
What is a healthy rate of weight loss?
Most clinical guidelines put sustainable loss at 0.5 to 2 lb per week, or roughly 0.2 to 0.9 kg. Anything above 2 lb per week tends to pull from muscle and water rather than fat and is often regained. The calculator flags weekly rates above 2 lb.
Is losing 5 percent of your body weight significant?
Yes. Research on prediabetes, blood pressure, and joint pain consistently shows clinical benefits at a 5 to 10 percent loss of starting body weight. You do not need to hit an ideal weight to move the needle on health markers.
Why does my BMI drop more slowly than my weight percent?
BMI scales linearly with weight at a fixed height, so a 10 percent weight loss is a 10 percent BMI drop. The number looks smaller because BMI starts around 25 to 30, not 100. A drop from 28.7 to 25.8 BMI is the same proportion as 200 lb to 180 lb.
Is this calculator medical advice?
No. Educational use only. Discuss any weight-loss plan with your doctor, especially if you take medications, are pregnant, or have a chronic condition.

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