Percentage Calculator - Arabic Numerals

Input: What is 15% of 250?

Result: 15% of 250 = 0.15 × 250 = 37.5

Input: Percentage change from 80 to 100

Result: Change = ((100 − 80) / 80) × 100 = 25% increase

How do I calculate a percentage increase when the original number is negative?

Percentage change with a negative base is a common source of confusion. If revenue goes from -50 to +50, the formula gives (50 - (-50)) / |-50| × 100 = 200%. But if revenue goes from -50 to -25, the formula gives (-25 - (-50)) / |-50| × 100 = 50% — a 50% improvement even though the number is still negative. Always use the absolute value of the original number as the denominator to avoid sign errors.

What is the difference between percentage points and percent change?

Percentage points measure the absolute difference between two percentages. If an interest rate rises from 5% to 7%, that is a 2 percentage point increase — but a 40% relative increase (because 2 is 40% of 5). Financial news often confuses these: "rates rose by 2%" could mean either 2 percentage points (5% to 7%) or a 2% relative increase (5% to 5.1%). The Percentage Change mode on this calculator computes the relative change; use the Difference mode for percentage point comparisons.

How do I calculate reverse percentage — finding the original price before a discount?

If an item costs $80 after a 20% discount, the original price was not $96 (a common mistake). The $80 represents 80% of the original, so the original is $80 / 0.80 = $100. Use the "Reverse Percentage" mode: enter 80 as the final value and 20 as the discount percentage, and the calculator returns the original price of $100.

How do I calculate what percentage one number is of another?

Use the "Find Percentage" mode. Enter the part (smaller number) and the whole (larger number). For example, to find what percentage 25 is of 200, enter Part: 25 and Whole: 200. The calculator will show 12.5%.

What percentage calculations are available?

The percentage calculator handles six common calculations: percentage of a number, percentage change (increase/decrease), what percentage one number is of another, reverse percentage, adding a percentage to a number, and subtracting a percentage.

Are these the same numerals used in Iran and Afghanistan?

No. Iran and Afghanistan use Persian (Farsi) numerals (۰–۹), which look similar but have different glyph forms for 4, 5, and 6. This calculator has a separate Persian numeral mode for those digits.