Percentage Calculator
GeneralUse this percentage calculator for quick everyday maths: X% of Y, what percentage one number is of another, percentage increase or decrease, and marks percentage — all in one tool.
Your estimate
Estimates only — verify important figures with official sources.
How it works
Each operation applies its own formula. For example, “X% of Y” is X ÷ 100 × Y, and “percentage increase” is (B − A) ÷ A × 100. Zero denominators are guarded and shown as “—”.
Example calculation
- 15% of 200 = 30.00
- Increase from 100 to 120 = 20.00%
Important notes
- Percentages can exceed 100% (for example, 200 is 400% of 50).
- Results are rounded to two decimal places for display.
Apply percentages to prices with the VAT Calculator for Bangladesh VAT.
Frequently Asked Questions
Five: X% of Y, X is what % of Y, percentage increase, percentage decrease, and percentage difference between two numbers.
Operations that would divide by zero (for example, “what % of 0”) show “—” instead of an error or infinity.
As the absolute difference between the two numbers divided by their average, expressed as a percentage.
Divide the marks obtained by the total marks and multiply by 100. Use the "X is what % of Y" operation above with obtained marks as X and total marks as Y.
Percentage results are mathematical calculations and are provided for general use.
Last updated: September 2026