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`PC = ( WF - WI )/( WI )`

Enter a value for all fields

The **Percentage Change in Weight **calculator computes the ratio of change in weight or mass from an initial to a final weight or mass.

**INSTRUCTIONS:** Choose units and enter the following:

- (
**WI**) Initial Weight - (
**WF**) Final Weight

**Percent Change in Weight (PC):** The calculator the percent change in weight or mass.

The formula for percent change in weight or mass is:

PC = (WF - WI) / WI

where:

- PC is the percent change in weight or mass
- WF is the final weight
- WI is the initial weight