Four calculation modes on one page, with live results, shareable links, and a worked-out solution shown for every answer. Pick a question, type your numbers, get a clear explanation.
Each one is the main calculator tuned for a specific real-world question, with extra context and step-by-step explanations.
The price after a sale. Enter the original price and the percent off — get the final price and savings.
Restaurant tipping made simple. Bill amount + tip percent + party size = each person’s share.
Convert points scored to a percentage. Handles single tests and weighted course grades.
Pricing math for businesses: cost + markup = sell price, or sell price − cost = margin.
The change from one number to another, expressed as a percent. Use it for stock prices, traffic, growth.
Symmetric comparison of two values, neither one designated as “original”.
Direct “what is P% of X” calculator, with examples for tax, tips, and shopping.
Browse every specialty calculator on the site.
Most percentage calculators only handle three of the four standard question types. Ours covers all four — including “Y is P% of what?” which surprisingly often gets left out.
No “Calculate” button to click. Edit any field and the result, formula, and step-by-step solution update instantly.
Every calculation shows the formula and a worked-out solution with your numbers — useful for school, double-checking your work, or just learning.
Toggle dark mode any time — your choice is remembered across visits. It’s the only percentage calculator we know of that has one.
Copy the result to your clipboard, or generate a shareable link that loads your exact inputs on the recipient’s screen.
All math happens client-side. Nothing you type ever leaves your device. No sign-up, no tracking of your inputs, no logs.
A percentage is a way of expressing a number as a fraction of 100. The word literally means “per hundred”: 25% means 25 out of every 100. The symbol % evolved from the Italian per cento, contracted over centuries into the modern sign.
Percentages let us compare quantities that have different totals. If one class has 18 students passing out of 24, and another has 22 passing out of 30, the percentages (75% and 73.3%) make the comparison instant. The raw counts wouldn’t.
Almost every percentage problem in school, business, or everyday life fits into one of four templates. Our calculator handles all four:
If you can map your problem to one of these, you’ve solved it. The calculator above does the rest.
Multiply the number by the percentage and divide by 100. For example, to find 15% of 80: 80 × 15 ÷ 100 = 12. The calculator above does this automatically — pick "% of" mode, type both numbers, and the result appears.
Final value = original × (1 + percent ÷ 100) for an increase, or original × (1 − percent ÷ 100) for a decrease. So a $100 item with a 20% increase becomes $100 × 1.20 = $120. A $100 item with a 20% discount becomes $100 × 0.80 = $80.
Percent describes a relative change between two values; percentage points describes the absolute difference between two percentages. If a poll goes from 40% to 44%, that's a 4-percentage-point increase but a 10% increase (because 4 ÷ 40 × 100 = 10).
Divide the smaller number (the part) by the larger number (the whole), then multiply by 100. For example: what percent of 80 is 12? 12 ÷ 80 × 100 = 15%. Use the "is %" mode of the calculator.
Yes — click the "Share link" button next to any result. This copies a URL with your inputs encoded as parameters. The recipient sees the exact same calculation when they open it.
After the first load, yes — all calculation logic runs in your browser. You can disconnect from the internet and the page will keep working until you close the tab.
Yes, completely free with no sign-up. The site is supported by ads. Your calculation inputs and results never leave your browser.
Yes — we provide a copy-paste embed snippet. See the embed widget section below.