Find the difference between the two values
Divide the difference by the reference value
Multiply the result by 100
Use this formula: Percentage Difference = ((New Value – Old Value) / Old Value) × 100
If comparing two values without a reference, use: Percentage Difference = (|Value 1 – Value 2| / ((Value 1 + Value 2) / 2)) × 100
Convert the result to a percent sign (%)