Free Online Calculators & Tools

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Choose a calculation type

What is% of?

30

15% × 200

= 15/100 × 200

= 0.15 × 200

= 30

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Popular Tools

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Percentage Calculator

Calculate percentages, percentage change, and percentage difference.

Discount Calculator

Calculate sale prices and savings with any discount percentage.

Work Hours Calculator

Calculate work hours from clock-in/out times with break deductions and weekly tracking.

Time Calculator

Add durations or find elapsed time between two clock times, in HH:MM:SS, decimal hours, and minutes.

Percentage Increase Calculator

Calculate percentage increase or decrease between two values with step-by-step formulas.

Salary Calculator

Calculate take-home pay after federal and state taxes for all 50 US states.

Calculate tips and split bills between multiple people.

Calculate your GPA from course grades and credit hours.

Fraction Calculator

Add, subtract, multiply, and divide fractions with step-by-step solutions.

Sales Tax Calculator

Calculate sales tax on any purchase with US state tax rates.

Free online calculator with basic and scientific modes.

Calculate your exact age in years, months, days, and more.

Why SlickCalc?

Instant Results

Results update as you type. No buttons to click, no page reloads.

Zero Ads

No ads, no pop-ups, no distractions. Just clean tools that work.

100% Private

All calculations run in your browser. The numbers you enter are never sent to our servers.

Why SlickCalc?

SlickCalc provides instant, accurate calculations without ads, pop-ups, or distractions. Every calculator is designed for speed — results update as you type, with clean visualizations that make numbers easy to understand.

Whether you're splitting a dinner bill, calculating a discount while shopping, figuring out profit margins for your business, or working with percentages for school — SlickCalc has you covered with free, reliable tools that work on any device.

Frequently Asked Questions

Is SlickCalc free to use?

Yes, all calculators and tools on SlickCalc are completely free with no registration required. We believe useful tools should be accessible to everyone.

Do my calculations get stored or shared?

No. All calculations happen directly in your browser, and the numbers you enter are never sent to our servers. Some calculators remember your last inputs in your own browser so you can pick up where you left off; clearing your browser data removes them. We use analytics tools (Google Analytics and Statcounter) to count visits and tool usage, but they do not include your inputs.

Can I use SlickCalc on my phone?

Absolutely. SlickCalc is fully responsive and works great on phones, tablets, and desktops. No app download needed — just open it in your browser.