Instant Math & Financial Calculations

Free Online Percentage Calculator

Fast, accurate percentage calculator. Find percentage of a number, percentage increase or decrease, markups, discounts, and ratio conversions instantly.

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Multi-Mode Calculations

Solve all 3 core percentage problems: what is X% of Y, X is what % of Y, and % increase/decrease.

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Growth & Margin Analysis

Quickly determine revenue growth, price markups, profit margins, and exam score percentages.

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Instant Real-Time Results

Results update with clear formulas so you understand the math behind the numbers.

Mastering Everyday Percentage Calculations

A percentage represents a fraction or ratio expressed as a fraction of 100. Percentage calculations are foundational for evaluating retail discounts, taxes, investments, academic test scores, and economic indicators.

1
Select Calculation Type

Choose whether you want to find a simple percentage or calculate percentage change.

2
Enter Your Values

Type the base number and the target percentage or comparison value.

3
View Detailed Result

Get the accurate answer along with step-by-step mathematical reasoning.

Frequently Asked Questions

What is the formula for percentage increase or decrease?
The percentage change formula is: ((New Value - Old Value) / |Old Value|) × 100%. A positive outcome signifies a percentage increase, while a negative outcome indicates a percentage decrease.
How do I calculate what percentage of one number is another?
Divide the part by the total whole and multiply by 100: (Part / Whole) × 100%.
Can I use this for test score or academic grade percentages?
Yes, simply input your obtained score as the part and total possible marks as the whole.

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