Percent Weight Change Calculator

Calculating the percentage weight change can be essential in various fields, including fitness, health monitoring, and scientific research. This Percent Weight Change Calculator provides a quick and easy way to determine the percentage change between an initial and final weight.

Formula: The percent weight change is calculated using the formula: Percent Change=(Final Weight−Initial WeightInitial Weight)×100Percent Change=(Initial WeightFinal Weight−Initial Weight​)×100

How to Use:

  1. Enter the initial weight in pounds.
  2. Enter the final weight in pounds.
  3. Click the “Calculate” button to get the percent weight change.

Example: Suppose the initial weight is 150 lbs, and the final weight is 135 lbs. Percent Change=(135−150150)×100≈−10.00%Percent Change=(150135−150​)×100≈−10.00% In this example, the weight decreased by 10%.


  1. Q: How is percent weight change calculated? A: It is calculated using the formula: (Final Weight−Initial Weight)/Initial Weight×100(Final Weight−Initial Weight)/Initial Weight×100.
  2. Q: Is the calculator accurate for any unit of weight? A: The calculator is designed for pounds; for other units, ensure consistent conversion.
  3. Q: What if the final weight is greater than the initial weight? A: The result will be a positive percentage, indicating weight gain.
  4. Q: Can I use this calculator for body mass index (BMI) calculations? A: No, this calculator specifically calculates percent weight change.
  5. Q: Why is the result negative in some cases? A: A negative result indicates weight loss, while a positive result indicates weight gain.

Conclusion: The Percent Weight Change Calculator simplifies the process of determining the percentage change between two weights. Whether tracking personal fitness goals or monitoring changes in experimental subjects, this calculator provides a quick and effective solution. Use it to gain valuable insights into weight fluctuations and make informed decisions about health and well-being.

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