Math Calculators

Percentage Calculator

Calculate percentages in 3 modes: X% of Y, X is what % of Y, and % change between two values. The formula is shown alongside every answer.

3 Calculation Modes
% Change
Formula Shown
Instant
Browser-only

Enter values to calculate

Percentage calculator

Find a percentage of a number, determine what percentage one value represents, or measure change between old and new values.

Formulas

Question	Formula
X% of Y	`(X / 100) × Y`
X of Y	`(X / Y) × 100`
Change	`((new - old) /

Frequently Asked Questions

What types of percentage calculations are supported?: Three modes: (1) What is X% of Y - finds a percentage of a value. (2) X is what percent of Y - finds the percentage one number represents of another. (3) Percentage change - calculates the % increase or decrease between two values.
How is percentage change calculated?: Percentage change = ((New Value - Old Value) / |Old Value|) × 100. A positive result means an increase; a negative result means a decrease. For example, going from 80 to 100 is a 25% increase.
What is the formula for finding a percentage of a number?: Value = (Percentage / 100) × Total. For example, 15% of 200 = (15 / 100) × 200 = 30.
What is the formula for finding what percent X is of Y?: Percentage = (X / Y) × 100. For example, 30 is what percent of 200? (30 / 200) × 100 = 15%.
Can I calculate percentage increase for sales or financial data?: Yes. Use the 'Percentage Change' mode. Enter the original value as 'From' and the new value as 'To'. This is useful for revenue growth, price changes, and performance metrics.

Disclaimer

This tool is provided for general informational and utility purposes only. Results may be inaccurate, incomplete, outdated, or contain errors. Always verify results before relying on or using them.

Some tools may use AI, automated processing, third-party services, or server-side processing. Do not rely on these tools as a substitute for professional advice.

Use at your own risk. BestToolOnline makes no guarantees regarding the accuracy, reliability, completeness, availability, or suitability of results, to the maximum extent permitted by applicable law.

See our Terms of Service and Privacy Policy for complete details.

Loading tool...

Question

Formula

X% of Y

(X / 100) × Y

X of Y

(X / Y) × 100

Change

`((new - old) /

Frequently Asked Questions

What types of percentage calculations are supported?

Three modes: (1) What is X% of Y - finds a percentage of a value. (2) X is what percent of Y - finds the percentage one number represents of another. (3) Percentage change - calculates the % increase or decrease between two values.

How is percentage change calculated?

Percentage change = ((New Value - Old Value) / |Old Value|) × 100. A positive result means an increase; a negative result means a decrease. For example, going from 80 to 100 is a 25% increase.

What is the formula for finding a percentage of a number?

Value = (Percentage / 100) × Total. For example, 15% of 200 = (15 / 100) × 200 = 30.

What is the formula for finding what percent X is of Y?

Percentage = (X / Y) × 100. For example, 30 is what percent of 200? (30 / 200) × 100 = 15%.

Can I calculate percentage increase for sales or financial data?

Yes. Use the 'Percentage Change' mode. Enter the original value as 'From' and the new value as 'To'. This is useful for revenue growth, price changes, and performance metrics.

Disclaimer

Some tools may use AI, automated processing, third-party services, or server-side processing. Do not rely on these tools as a substitute for professional advice.