Age Calculator
Calculate exact chronological age in years, months, and days, plus total days lived and a live countdown to your next birthday.
Percentage Calculator
4 CalculatorsCalculate X% of Y, what percent X is of Y, percentage increase, and percentage decrease with instant results and step-by-step math explanations.
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How to Use Percentage Calculator
- 1Pick one of the four percentage modes (or use all four side-by-side cards): 'X% of Y', 'X is what % of Y', 'Percentage Change (Increase/Decrease)', or 'Add/Subtract X% from Y'.
- 2Enter your numbers into the X and Y input fields.
- 3Read the instant calculated result along with the step-by-step formula breakdown directly below.
- 4Click 'Copy Result' on any card to copy the exact figure.
Key Features & Privacy
- ✦Covers all 4 essential modes: (1) What is X% of Y?, (2) X is what % of Y?, (3) Percentage Increase/Decrease from X to Y, and (4) Value after Percentage Increase/Decrease.
- ✦Displays the exact algebraic formula and substituted numbers for every calculation.
- ✦Handles decimal values, negative numbers, and zero-division edge cases gracefully.
- ✦Instant live calculation as you type.
Frequently Asked Questions
How is percentage increase or decrease calculated?
The formula is `((New Value - Original Value) / |Original Value|) × 100`. A positive result indicates a percentage increase, while a negative result indicates a percentage decrease.
What happens if the denominator or original value is 0?
Division by zero is undefined in mathematics, so the tool displays a clear 'Cannot divide by zero' explanation rather than `NaN` or `Infinity`.
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