A short companion for Percentage Calculator: when it is useful, what it expects, and what to check before using the result.
What it does
Work out percentages in the forms that actually come up: what X% of Y is, what percentage X is of Y, and the increase or decrease between two values.
Use the tool
Open Percentage Calculator, add the input the tool asks for, run it, and check the output before using it elsewhere.
Input and output
- Input: text.
- Output: text.
- Category: Math.
Privacy and processing
Processing happens locally in your browser. This tool does not upload the input to ilham.dev.
Questions
Why do a percentage rise and fall not cancel out?
Because they are relative to different bases. A 50% rise followed by a 50% fall leaves you at 75% of where you started, not back at the beginning.
Related guide
For broader background, see Dates, Timestamps, and Time Zones.