Percentage Points vs Percent Change: The Mistake That Skews Headlines
If a headline about your interest rate, tax bracket, or a candidate's poll numbers says it "rose 3%" while another outlet reports the same move as "3 percentage points," and nothing in the wording tells you which one you're looking at, the confusion isn't you misreading the story. "Unemployment rose 5 percent" and "unemployment rose 5 percentage points" describe two very different situations. One of them is twice as bad as the other. And coverage conflates them more often than you'd expect.
The two numbers aren't the same kind of thing
A percentage point is a unit of straightforward subtraction: if a rate moves from 5% to 10%, that's a 5 percentage point increase, full stop. Percent change is a ratio: the same move from 5% to 10% is a 100% increase, because the rate doubled relative to where it started. Both descriptions are accurate. They're just answering different questions ("how many points did it move" vs "how much bigger is the new number relative to the old one"). And swapping one for the other changes the apparent size of the story by a wide margin, especially when the base rate is small.
This isn't just an abstract distinction. A mortgage or savings rate described as rising "3 percentage points" is a much bigger move than one rising "3%," and a tax bracket reported the same two ways can sound alarming or unremarkable depending purely on which framing got picked, not on anything about the underlying policy. Knowing which one you're reading is the difference between reacting to a number and correctly sizing what actually changed.
Why the gap gets worse at small base rates
The smaller the starting percentage, the more percent change and percentage points diverge. A rate moving from 40% to 45% is a 5-point increase and a modest 12.5% relative increase. The two descriptions roughly agree. A rate moving from 2% to 7% is also a 5-point increase, but a 250% relative increase. Wildly different-sounding numbers for the identical absolute move. This is exactly why the choice of framing matters most in exactly the situations. Small base rates, like disease incidence, approval ratings, or default rates. Where headline writers most want a dramatic-sounding number.
How finance sidesteps the whole ambiguity
Interest rates and bond yields move in small enough increments that "percent" itself becomes ambiguous. A rate "rising by 1%" could mean 1 percentage point or a 1% relative increase, and the two are very different amounts of money on a large loan. The finance industry's fix is the basis point: exactly one-hundredth of one percentage point (0.01 percentage points). When a central bank raises rates "25 basis points," that's unambiguous. A 0.25 percentage point move, full stop, no relative-versus-absolute confusion possible, which is precisely why the unit exists.
What to actually do about it
If your goal is just parsing a headline correctly, treat any percentage change reported without the starting value as incomplete: "up 20%" means something completely different starting from 2% than starting from 40%, so look for the base rate before reacting to the size of the move. If your goal is comparing two percentages yourself, whether it's a rate change, a poll swing, or a tax bracket, work out both the percentage-point difference and the percent change and see which one matches the framing you read; they can differ by an order of magnitude at small base rates, as shown above. And if you suspect a headline picked the more dramatic-sounding framing on purpose, check the base rate first: that gap is largest exactly where the base rate is small, which is also where a small absolute move can be reported as an enormous relative one.
Work out the percentage change, the percentage-point difference, or a straight percentage of a number with the percentage calculator.