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Weight Management Calculators

Weight Change Percentage Calculator

Percentage of body weight lost or gained between two weigh-ins, and the change per week.

Enter values

Results update as you type.

Result

Change

-7.07%

Absolute change
6.5
Per week
0.65
Direction
Loss

About the Weight Change Percentage Calculator

Percentage of body weight lost or gained between two weigh-ins, and the change per week.

Also known as: percent weight loss, body weight percentage change, weight loss percentage.

How to use this calculator

  1. Enter starting weight, current weight, weeks between.
  2. The result updates instantly as you type — press Calculate (or Enter) at any time.
  3. Review the breakdown shown under the main result.
  4. Use Copy result or Share to save the answer or send a link with your inputs.

Formula

% change = (now − start) ÷ start × 100

Worked example

Using the values pre-filled in the calculator above:

  • Starting weight = 92
  • Current weight = 85.5
  • Weeks between = 10

the calculator returns:

  • Change: -7.07%
  • Absolute change: 6.5
  • Per week: 0.65
  • Direction: Loss