Percentage Calculator – Free Online Math Tool

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What is a Percentage Calculator?

A Percentage Calculator is a free online math utility that instantly solves complex percentage problems. It can find ‘What is X% of Y?’, determine ‘X is what % of Y?’, and calculate the percentage increase or decrease between two numbers.

Why We Built This (And Why You Can Trust It)

Calculating percentage differences by hand requires remembering specific formulas (like subtracting the old value from the new value and dividing by the old value). We built this instant, offline calculator to do the math for you, saving you time and preventing simple arithmetic errors.

How to Use the Percentage Calculator

1. Select the specific type of percentage calculation you need from the options.

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2. Input your two numbers into the appropriate fields.

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3. The tool instantly computes the missing variable in real-time.

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4. Read the plain-English sentence summarizing the result.

Common Use Cases

• **Sales Growth:** Calculate the exact percentage increase in your company’s revenue from Q1 to Q2.
• **Shopping:** Quickly figure out exactly how much a 15% discount will save you on a large purchase.
• **Statistics:** Determine what percentage of a demographic group answered ‘Yes’ to a survey question.

Frequently Asked Questions

Can it handle very small decimals?

Yes, the calculator relies on JavaScript’s floating-point math, allowing it to calculate fractions of a percent with high accuracy.

Why use this instead of a phone calculator?

Standard calculators require you to remember the formula. Our tool uses natural language prompts (like ‘What is 15% of 350?’) so you just plug in the numbers and get the answer.

Is my data logged?

No. All calculations are performed entirely locally on your device for complete privacy.