How to calculate weight gain percentage?

Weight gain percentage is calculated by taking the weight gained (Current Weight - Starting Weight), dividing it by the Starting Weight, and multiplying by 100. It clarifies the significance of the gain relative to the original body mass.

Formula

Gain % = ((Current Weight − Start Weight) ÷ Start Weight) × 100

Worked Example

Start: 150 lbs, Current: 165 lbs.

1. Gain: 165 − 150 = 15 lbs
2. Ratio: 15 ÷ 150 = 0.10
3. Percent: 0.10 × 100 = 10%

Result: You gained 10% body weight.