Revenue went from 80 to 100. Was that a 25% increase or "20 more points"? Rent rose from 1,200 to 1,380 and someone wants the hike in percent for a lease summary. The form compares original to new and prints the percent change—handy when both numbers are already on the spreadsheet and you need the rate for a sentence.
Do not enter a percent in the first box. If you know 25% and need dollars, use the percent-of-a-number page instead.
Percent change from 80 to 100 is the default—up 25%—still rechecked when someone swaps the columns.
Increase vs decrease wording
Going from 100 down to 80 is negative change; going from 80 up to 100 is positive. Plenty of people flip old and new when the story is a drop—read which value is original in the form before you quote the percent in email.
A quick slice question belongs elsewhere—20% of a $240 order. Part-over-total percent is 5 out of 20 as a percent.
- Zero in the original box breaks the rate—handle that case outside this form.
- Round the percent for slides; keep both inputs in the footnote.
- One comparison per run; chained years need separate rows.
The percentage change mistakes note catches the usual column swaps. Ordinary reporting math, not investment advice.