Corrections and updates
When we fix a calculation or add to a guide, we note it here on the same day. Spelling-only fixes are not listed. This page covers the English pages; changes made only to the Korean pages appear on the Korean page. If you spot a mistake, please tell us through the contact page.
October 2026
Fix
Fixed reversed direction of change for negative starting values
Percent change from A to B is now divided by the absolute value of A. For example, going from -100 to -50 now shows a 50% increase instead of a decrease. Results are unchanged when the starting value is above 0. This fix was made before the English page opened; it is listed here because the English calculator uses the same calculation.