Percentage Change Calculator

Compare two values to calculate percent increase or decrease, absolute delta, and ratio. Designed for quick metric, price, and budget analysis.

Calculate Percentage Change

Helper: original value cannot be zero because percent change divides by the original baseline.

Baseline value before change.

Current or updated value.

Percent change

+25.00%

Absolute delta

+25.00

Ratio (new/original)

1.2500x

Direction

Increase

Enter original and new values to compute percent change and direction.

Formula

Percentage change = ((new - original) / |original|) x 100

How it works

The tool calculates delta (new - original), divides by the absolute original value, then multiplies by 100 to return a signed percentage.

Using absolute original preserves intuitive direction while supporting negative baselines. If original is 0, percentage change is undefined.

Source: Standard percent-change method used in algebra and introductory statistics.