Percentage calculator
Calculate percentages online, including percent of a number, percentage increase, and percentage decrease.
Scientific calculator
Use a free online scientific calculator for advanced math, trigonometry, exponents, roots, and more.
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How to use Scientific calculator
A free online scientific calculator for math, trigonometry, exponents, square roots, and logarithms. Works on desktop and mobile with large tap-friendly buttons.
Supported functions
- Basic arithmetic: +, −, ×, ÷
- Trigonometry: sin, cos, tan (degrees)
- Powers, square root, natural log, and parentheses
Scientific calculator FAQs
Is Scientific calculator free?
Scientific calculator is a free online tool on ReallyUseful.Tools. No account is required.
Does Scientific calculator run in my browser?
Scientific calculator is designed to run in your browser where supported, so files can stay on your device instead of being uploaded to a server.
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