Percentage Calculator

A versatile tool for all your percentage needs. Calculate percent of values, percentage change, and relative proportions instantly.

What is X% of Y?

What is% of= 30.00

X is what % of Y?

is what % of?

Tip: Use these for tips, taxes, and discounts.

Understanding Percentages

The word "percent" comes from the Latin per centum, which literally means "by the hundred." In mathematics, a percentage is a number or ratio expressed as a fraction of 100.

How to Calculate Percentage Manually

To find the percentage of a number, you follow this simple logic: (Part / Whole) × 100 = Percentage.

Example: If you got 45 out of 50 on a test, you divide 45 by 50 to get 0.9, then multiply by 100 to get 90%.

Percentage Increase vs. Decrease

Calculating the change between two values is essential in finance and data analysis. The formula is:

((New Value - Old Value) / |Old Value|) × 100