6 min read · Free educational guide
Why this distinction matters
News headlines and finance apps often say something “rose 2%” when they mean 2 percentage points — or the reverse. Mixing them up can make a small move sound huge, or a large relative jump sound tiny.
Both ideas are valid; they answer different questions. Percentage points measure absolute difference on a percent scale. Percent change (or relative percentage) measures how big that move is compared with the starting value.
Percentage points (absolute difference)
If a value is already expressed as a percent, the gap between two rates is often stated in percentage points (pp).
- Interest rate: 3% → 5% is an increase of 2 percentage points
- Poll: candidate support 48% → 51% is +3 percentage points
- Tax: VAT 20% → 21% is +1 percentage point
Percent change (relative difference)
Relative change asks: “How large is this move compared with where we started?” Use ((new − old) ÷ |old|) × 100.
- 3% → 5%: relative increase = (2 ÷ 3) × 100 ≈ 66.7%
- 48% → 51%: relative increase = (3 ÷ 48) × 100 = 6.25%
- A raise from $50,000 to $55,000 is a 10% increase (not “10 percentage points” unless you are talking about a rate).
Quick comparison table in words
Use percentage points when both numbers are already percentages and you want the simple subtraction. Use percent change when you care about growth relative to the baseline — prices, salaries, user counts, or rates when the story is “how big was the jump?”
If a headline says unemployment “jumped 50%” from 4% to 6%, that is relative change; the absolute move is 2 percentage points. Both can be true at once.
How PercentBox helps
The percentage change calculator computes relative change between any two numbers. For “apply X% to a value,” use the increase or decrease tools. Always label your answer clearly: “% change” versus “percentage points.”
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FAQ
- Is a 2 percentage point increase the same as a 2% increase?
- Only if the starting rate is 100%. From 10% to 12% is +2 percentage points but a 20% relative increase.
- Which should I use in school?
- Follow the question wording. “By how many percentage points” means subtract the rates. “By what percent did it increase” usually means relative change.