Math & NumbersPercentage Calculator

Percentage Calculator

Calculate percentages with multiple modes: what is X% of Y, X is what percent of Y, and percentage change between two values (increase or decrease). Useful for discounts, tax calculations, grade conversions, and data analysis.

What is X% of Y?

X (percent)

Y (value)

X is what % of Y?

X (part)

Y (whole)

Percentage change

From

Add X% to Y

Y (base)

X (percent to add)

Subtract X% from Y

Y (base)

X (discount %)

X is Y% more/less than Z?

Z (reference)

Percentage Calculator guide

Percentage Calculator runs in your browser, which keeps everyday developer workflows fast and avoids unnecessary uploads for normal use. Calculate percentages with multiple modes: what is X% of Y, X is what percent of Y, and percentage change between two values (increase or decrease). Useful for discounts, tax calculations, grade conversions, and data analysis.

Key features

Work with Percentage Calculator
Supports the common formats, options, and data patterns developers expect for this task.
Designed for quick copy, paste, inspect, and export workflows.
Work with percentage, percent, calculate, discount

Common use cases

Debug data, text, configuration, or code snippets during development.
Prepare clean examples for documentation, tests, tickets, and API debugging.

Frequently asked questions

Is this tool safe for private data?

The tool runs in your browser and is designed for local processing instead of sending pasted content to an application server.

Is this tool free to use?

Yes. Toolfy tools are free online utilities for everyday developer workflows.

Statistics Calculator

Calculate descriptive statistics from a dataset: mean (average), median, mode, range, variance, standard deviation, sum, min, max, and count. Paste or enter comma-separated numbers for instant analysis.