Percentage Calculator
About Percentage Calculator
Solve everyday percentage problems in one place: find what percent one number is of another, work out a percentage increase or decrease, and calculate the percentage difference between two values. Each result shows the formula used so you can follow the working — useful for discounts, taxes, tips, exam scores, and comparing changes over time. The calculator runs instantly in your browser.
How To Use
- Enter the values the calculator asks for — amounts, dates, ratios, speeds, or grades.
- The result updates instantly as you type, with the working shown where it helps.
- Copy the answer, or adjust the inputs to compare different scenarios.
Example
Input: Two numbers, a couple of dates, or a ratio you want to work out.
Output: The computed result, with the breakdown shown where it helps you check the working.
Who Uses Percentage Calculator
- Students and professionals who want private calculators with clear workings.
- Anyone doing everyday math without apps or data collection.
- People who prefer private — files and text stay on your device and are never uploaded to a server.
Frequently Asked Questions
How do I calculate a percentage of a number?
Multiply the number by the percentage and divide by 100. For example, 20% of 80 is (80 × 20) ÷ 100 = 16. This calculator does that step for you and shows the formula.
How is percentage increase calculated?
Subtract the original from the new value, divide by the original, and multiply by 100. A rise from 50 to 75 is a 50% increase ((75−50) ÷ 50 × 100).
What is the difference between percentage change and percentage difference?
Percentage change measures a move from an original value to a new one. Percentage difference compares two values with no defined original — it divides the difference by their average.
Can I use this for discounts and taxes?
Yes. Enter the price and the percentage to find the discount amount or the tax to add. The calculator is handy for sale shopping, invoicing, and finance homework.