Percentage Point Formula (B Minus A) Explained

What the formula measures

The percentage point formula measures an additive shift between two percentages that already live on the same scale. Think of it as the vertical distance between two ticks on a percent axis, not a rescaling of the axis itself.

That framing matters when you compare rates, margins, or survey results where the audience expects the headline numbers to subtract cleanly.

Formula and sign rules

Use PP equals B minus A when your narrative order is “from A to B.” If you intentionally compare in reverse order, flip the subtraction and explain why so the sign still matches the English.

Keep decimals consistent. If one side is published as 4.5 and another as 4.50, they should still subtract after you confirm both mean percent, not decimal odds.

Step-by-step guide

1. Write both percents with the same implied denominator.
2. Align A as the starting point and B as the ending point.
3. Compute B minus A with the precision your style guide allows.
4. Round for display, not for internal checks, and keep the raw gap in a spreadsheet column.

If you are pairing this note with a teaching outline, the what is a percentage point article gives a gentler ramp for readers who are new to the vocabulary.

Worked example

Margin moves from 11.0% to 11.6%. The point gap is 0.6 percentage points. If a teammate asks for “percent uplift,” that is a separate ratio question; the percentage points versus percentage change guide shows how to keep both views honest in one memo.

For spreadsheet-heavy teams, the Excel percentage point calculations article shows how to avoid double-scaling when percent format is on.