Weight Change Percentage Calculator
Measure how much your weight has changed, in kg and as a percentage.
Your result
A loss of 5–10% of starting body weight is a common first goal and is linked to meaningful health gains.
Medical disclaimer: This tool is for education and is not medical advice. Read more.
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Frequently asked questions
What does the Weight Change Percentage Calculator do?
Measure how much your weight has changed, in kg and as a percentage. Enter your values and the result and chart update instantly.
How accurate is it?
It uses published, widely used formulas. Results are estimates for education and planning, not a diagnosis. Talk to a qualified clinician about decisions affecting your health.
Is my information stored or shared?
No. All calculations run in your browser and nothing you type is sent to a server or saved.
What can I search to find this tool?
People find it by searching for: percent weight loss; how much weight have i lost; weight change over time.