Percentage points measure the arithmetic difference between two percentages. Percent change describes how large that difference is relative to the starting value. These answer different questions.
A Quick Example
If a rate moves from 10% to 12%, it increases by 2 percentage points. Relative to the original 10% rate, the increase is 20%, because the 2-point difference is one fifth of 10.
When a rate falls from 12% to 10%, the change is a decrease of 2 percentage points and a relative decrease of about 16.7%. The denominator matters: relative change is measured against the original value.
Which One Should You Use?
Use percentage points when comparing two percentages directly, such as interest rates, survey shares, or conversion rates. Use percent change when describing the proportional increase or decrease from a starting number. Name the measure in reports so readers know which comparison you mean.
Use the Percentage Calculator for relative change and the Loan Calculator to explore example rate and payment scenarios. A calculator result is only as reliable as the values and assumptions entered.