Everyday choices, with a basis.
Percentage change
Check the difference between two values and keep a calculation card.
Your answer appears here
Enter your values, or try the labelled example. Nothing is sent.
My calculation cards0 / 20
Saved only when you choose. Stored in this browser, not an account or cloud. Other people using this browser can see them; clearing browser data removes them.
Calculate first, then name and save the result.
Save a result you want to revisit. Next time, change only what is different.
Up to 20 cards. JSON only, up to 1 MiB. Import adds cards; it never replaces existing ones.
How it works · device settings
Remember only the basic inputs
This setting remembers basic tool inputs. Save a card to keep the task mode and required amount. Shared devices may expose saved inputs.
How it is calculated
Change = new value − original value. Percentage change = change ÷ original value × 100.
Example
80 → 100: change +20, increased by 25%. 100 → 80: change −20, decreased by 20%. 80 → 0: decreased by 100%.