What is Percentage Calculator?
Percentage Calculator solves the five most common percentage problems instantly: what is X% of Y, what percent X is of Y, the percentage increase or decrease between two numbers, adding a percentage (like tax or GST) and subtracting a percentage (like a discount).
Results update as you type, and you can click any answer to copy it. It’s quicker than a phone calculator and you don’t need to remember any formulas.
How to use Percentage Calculator
Get it done in 4 simple steps — no installation or account needed.
- Find the calculation that matches your question.
- Type the two numbers into its fields.
- Read the answer instantly on the right.
- Click the answer to copy it.
How Percentage Calculator calculates results
- X% of Y = Y × X ÷ 100.
- X is what % of Y = X ÷ Y × 100.
- Percentage change from A to B = (B − A) ÷ |A| × 100. Positive is an increase, negative is a decrease.
- Add X% to Y = Y × (1 + X ÷ 100) — used for GST, VAT or tips.
- Subtract X% from Y = Y × (1 − X ÷ 100) — used for discounts.
- Results are shown with up to 6 decimal places and are not rounded to currency units.
Who needs Percentage Calculator?
From students to professionals, here’s who gets the most out of Percentage Calculator — and why.
Shoppers
Work out sale prices and how much a discount really saves.
Students
Calculate marks percentages and check homework.
Business owners
Add GST/VAT, compute margins and growth rates.
Investors
Measure returns and price changes in percent.
Is Percentage Calculator safe to use?
Yes. Percentage Calculator runs entirely in your web browser using JavaScript. Your files and data are processed on your own device and are never uploaded to AppsOcean or any third-party server. There’s nothing to install, no account to create, and it’s completely free.Read our privacy policy.
Percentage Calculator — frequently asked questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 15% of 200 = 200 × 15 ÷ 100 = 30.
How do I add 18% GST to a price?
Use “Add % to”: enter 18 and the price. The result equals price × 1.18.
How is percentage change calculated?
(New − Old) ÷ Old × 100. A positive result is an increase, negative is a decrease.
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