Body Percent Weight Loss Calculator

The starting value for a change, the accepted (true) value for percent error.
The ending value for a change, the measured (experimental) value for percent error.
Answer for the selected comparison
-50 %
Percentage Change, Difference and Error Calculator
What the answer is
Body weight lost
In words
Starting weight 50, current weight 75: no loss — the weight is up by 50% of the starting weight.
Percentage change
50 %
Percentage increase
50 %
Percentage decrease
-50 %
Absolute change (final - initial)
25
Percentage difference
40 %
Percent improvement
50 %
Percent error
50 %
Relative error (a fraction, not a percentage)
0.5
Final / initial
1.5
Direction
increase
Formula used
weight loss % = (starting weight - current weight) / starting weight x 100
Worked out from Wikipedia, "Relative change and difference" — relative change uses |x_reference| in the denominator; percentage difference uses the mean of the magnitudes and 1 other source.
This is arithmetic on the two weights you entered. It carries no judgement about whether a rate of loss is safe or advisable.

How this is worked out

3 steps
  1. Weight lost = 50 - 75 = -25
  2. Divide by the starting weight: -25 / 50 = -0.5
  3. Multiply by 100: -50% of the starting body weight

Results are general information, not financial, tax, legal, medical or engineering advice.