Business & Finance

Percentage Calculator

Calculate percentages, percentage increase or decrease, percentage of a number, and reverse percentage. Multiple calculation modes in one tool.

🔒 Runs 100% in your browser — client-side processing, zero data sent to external servers.

What is Percentage Calculator?

The Percentage Calculator is a math utility that solves multiple types of percentage calculations. It handles basic questions like 'What is X% of Y?', 'X is what percentage of Y?', percentage increase/decrease between two numbers, and adding/subtracting percentages. It removes manual formula errors in business planning, markup calculations, and reporting.

How to Use Percentage Calculator

  1. Select the specific percentage calculation type you need from the options tabs.
  2. Input the required numbers in the value fields.
  3. The tool calculates and displays the answer instantly, along with the mathematical formula used for your reference.
  4. Copy the result using the copy icon.

Common Use Cases

  • Sales teams calculating customer discounts, wholesale markups, and profit margins.
  • Data analysts computing month-on-month growth rates, conversion changes, or traffic metrics.
  • Students and teachers solving mathematical problems or grading papers.

Pro Tips & Best Practices

  • For calculating sales tax, use the 'Add Percentage' tool. For finding discount savings, use the 'Subtract Percentage' tool.

Frequently Asked Questions

How do I calculate a percentage of a number?

Multiply the number by the percentage and divide by 100. For example, 25% of 200 = (200 × 25) / 100 = 50. This tool does it instantly for you.

How do I calculate percentage increase?

Percentage increase = ((New Value - Old Value) / Old Value) × 100. Enter both values and the tool calculates the percentage change automatically.

What is reverse percentage?

Reverse percentage finds the original number before a percentage was applied. For example, if a price after 20% discount is 80, the original price was 100.

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Curated by Haris Baig

Founder & Head of IT Infrastructure • Arbre IT Support

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