Key takeaway
The percentage-point difference between two rates is just their absolute subtraction: |A% − B%|. The gap between 30% and 45% is 15 pp. It carries no 'of what' — it is a flat distance on the scale, unlike a percent change which is relative to a starting rate.
Scope and assumptions
General convention. pp difference is absolute; percent change is relative. This site is informational and not official.
Short answer: The percentage-point difference between two rates is just their absolute subtraction: |A% − B%|. The gap between 30% and 45% is 15 pp. It carries no "of what" — it is a flat distance on the scale, unlike a percent change which is relative to a starting rate. This page covers the computation of a pp gap (|A − B|); for the unit's meaning see What Is a Percentage Point, and for the pp-vs-percent-change choice see Percent Change vs Percentage Points.
Quick navigation
- What a pp is → what-is-a-percentage-point
- Percent vs pp → percent-vs-percentage-point
- Change vs points → percent-change-vs-percentage-points
- The calculator → Percentage Calculator
1. The method
pp difference = |A% − B%|
Just subtract the two rates; the unit is pp, not %.
2. Worked examples
| A% | B% | |A−B| | pp difference | |---|---|---|---| | 30% | 45% | 15 | 15 pp | | 40% | 41% | 1 | 1 pp | | 10% | 10% | 0 | 0 pp | | 60% | 50% | 10 | 10 pp |
3. pp difference vs percent change
Between 30% and 45%:
- pp difference: 15 pp (flat gap)
- % change: (45−30)/30 × 100 = +50% (relative to 30%)
Different numbers, different meanings.
4. A polling example
Candidate A leads B 48% to 43%.
Lead = 48 − 43 = 5 pp
Reporting "a 5-point lead" is exact; saying "a 5% lead" would wrongly imply 5% of something.
5. Common mistakes
- Calling it a 'percent difference' — say pp difference to avoid the relative reading.
- Computing relative change instead — pp is flat subtraction, not (new−old)/old.
- Dropping the unit — write pp, not %.
- Confusing with share — a pp difference compares two rates, not a part to a whole.
6. Percentage points in polls and rates
A poll lead of "5 points" means 48% to 43% — a flat 5 pp gap, not 5% of anything. An interest-rate decision "up 25 basis points" is 0.25 pp. In both cases the unit is a flat step on the scale, which is why pp (or bps for tiny steps) is the honest choice. Reaching for "percent" there implies a ratio to a base that the speaker never meant, and the number misleads.
7. A flat step, not a ratio
A percentage-point difference is a flat distance between two rates, not a ratio to a base, which is why 48% to 43% is a 5 pp lead and never "5% of anything". Calling it a percent implies a share of some whole that the speaker never meant. The honest unit for a gap between rates is pp (or bps when the steps are tiny), because the difference is a step on the scale, not a fraction of a total. State "points" and the number describes exactly what happened to the rate, with no hidden base for a reader to invent.
8. State points, not percent
A gap between two rates is a flat step, so the unit is points, and calling it a percent quietly implies a share of a whole that was never there. 48% to 43% is a 5 pp lead; it is not "5% of" anything. The honest phrasing names "points" so the number describes the move on the scale, not a fraction of some total. Reach for points whenever you report a difference of rates, and the unit alone prevents the most common misreading of poll leads and rate moves in everyday writing.
FAQ
Q: How do I find the percentage point difference? Subtract the two rates: |A% − B%|. Between 30% and 45% the difference is 15 pp.
Q: Is pp difference the same as percent change? No — pp difference is the flat gap; percent change is relative to the starting rate.
Q: What is the pp difference between 40% and 41%? 1 pp.
Q: Can it be negative? The size is positive; if you keep order, 41% − 40% = +1 pp, 40% − 41% = −1 pp.
Q: Why use pp difference instead of %? It states the rate gap exactly without implying a ratio to a base.
Sources: Investopedia — Percentage Point; Khan Academy percentages.
Disclaimer: General convention. pp difference is absolute; percent change is relative. This site is informational and not official.
Sources and references
- Investopedia — Percentage Pointhttps://www.investopedia.com/terms/p/percentage-point.asp
- Khan Academy percentageshttps://www.khanacademy.org/math/pre-algebra/x31947de81e3f6453:percentages