Percentage Calculator

Calculate percentages, percentage of a number, and percentage change.

Value

Percentage15%

Total (for % of total)

15% of 200

200 as % of 800

25.00%

Change from Total

-75.00%

Formulas

Percentage of a number: (value × percent) / 100. Percentage change: ((new - old) / old) × 100.

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What is Percentage Calculator?

A percentage calculator computes percentages for various scenarios — what percent of a number is another number, percentage increase or decrease, and percentage of a total.

Percentages are used everywhere — discounts, marks, interest rates, taxes, and statistics. This calculator handles all common percentage problems in one place.

How does the Percentage Calculator work?

Percentage = (Part / Whole) × 100

For example, 25 out of 200 is (25/200) × 100 = 12.5%.

The calculator also handles percentage change: ((New – Old) / Old) × 100.

How to use the Percentage Calculator?

Choose the type of percentage calculation you need.
Enter the two known values.
The calculator instantly shows the result.

Example

Example calculation

Enter 25 as the part.
Enter 200 as the whole.
The results update instantly.

Percentage (%): 12.5

Benefits of using the Percentage Calculator

Solve all common percentage problems quickly.
Check discounts and sale prices.
Calculate marks and exam percentages.
Understand percentage changes in prices and salaries.

Who should use the Percentage Calculator?

Students practising problems and verifying homework answers.
Teachers preparing examples and checking student work.
Engineers and analysts who need quick, reliable calculations.
Anyone who wants to double-check manual arithmetic.

Tips for getting the most out of the Percentage Calculator

Check your inputs for typos — a single wrong digit changes the result completely.
Use the result to verify your manual working, not to replace understanding.
Try a simple case first (like 0 or 1) to make sure the output makes sense.

Frequently Asked Questions

How do I calculate percentage increase?

Subtract the old value from the new value, divide by the old value, and multiply by 100. For example, ₹100 to ₹120 is a 20% increase.

How do I find what percent one number is of another?

Divide the part by the whole and multiply by 100. For example, 30 is 15% of 200.

What is the difference between percentage and percentage points?

A percentage point is the arithmetic difference between two percentages. For example, an increase from 10% to 12% is a 2 percentage point increase but a 20% relative increase.

This calculator turns a tedious calculation into an instant answer, so you can focus on understanding the concept instead of the arithmetic.