About PercentCal

What Is PercentCal?

PercentCal is a free online percentage calculator designed to give you instant answers to everyday math problems — no sign-up, no account, no ads interrupting your flow. Whether you need to figure out a restaurant tip, check your test score, calculate a salary raise, or find out how much you're saving on a sale, PercentCal has a dedicated tool for it.

All calculations happen live as you type. There's no "Calculate" button to press and no page reload needed — results update in real time so you can focus on the numbers, not the tool.

Our Tools

• Basic Percentage Calculator — Answer all three core percentage questions simultaneously: "What is X% of Y?", "X is what % of Y?", and "X is Y% of what?"
• Percentage Change Calculator — Find the exact percentage increase or decrease between any two numbers, colour-coded for clarity.
• Discount Calculator — Instantly calculate the final price and savings for any discount percentage.
• Tax Calculator — Add any sales tax rate to any price, with quick-pick buttons for common US state rates.
• Tip Calculator — Calculate tips and split bills between any number of people.
• Grade Calculator — Convert any test score or marks to a percentage and letter grade.

Why We Built This

Most percentage calculators online are cluttered, slow, or buried behind sign-up walls. We built PercentCal because we wanted one clean, fast tool that covers all the percentage math people actually need day-to-day — accessible from any device, instantly, for free.

PercentCal is optimised for speed and simplicity. It works on desktop, tablet, and mobile browsers with no app install needed.

Privacy First

We do not require you to create an account or share any personal information to use PercentCal. All calculations are performed locally in your browser. See our Privacy Policy for full details on what data we collect and how we use it.

Contact Us

Have a question, suggestion, or found a bug? We'd love to hear from you. Get in touch via our contact form.