Scientific Calculator — Free Online Tool
Full scientific calculator — trig, logs, powers, roots & memory. · No signup · Works on mobile
100% private: your data is processed in your browser. Nothing is uploaded to our servers.
How to use the scientific calculator
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Type or tap your expression — e.g. sin(30) + √(144) × 2.
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Toggle DEG/RAD for trigonometry as needed.
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Press = or Enter to evaluate; use ANS to chain calculations.
What does this tool do?
This free online scientific calculator handles everything a handheld one does: trigonometry (sin, cos, tan and inverses in degrees or radians), logarithms, exponents, roots, factorials, π and e constants, and parentheses — with full keyboard support so you can type expressions directly.
How does the scientific calculator work?
Expressions are parsed with a proper order-of-operations engine (parentheses → functions → powers → multiplication/division → addition/subtraction) rather than naive left-to-right evaluation, so 2+3×4² correctly returns 50. A DEG/RAD toggle controls trigonometric input mode.
Frequently Asked Questions
Does this calculator follow BODMAS/PEMDAS order of operations?
Yes. It evaluates parentheses first, then functions and exponents, then multiplication and division left-to-right, then addition and subtraction. So 8 ÷ 2 × (2+2) evaluates to 16, and 2 + 3 × 4 evaluates to 14, matching every scientific calculator standard.
Should I use degrees or radians for trigonometry?
Use degrees for everyday geometry (sin 30° = 0.5) and radians for calculus and physics (sin π/6 = 0.5). The DEG/RAD toggle above the display shows the active mode — the most common cause of "wrong" trig answers is calculating in the wrong mode.
Is the scientific calculator really free?
Yes — 100% free with no hidden charges, trial limits, or premium tiers for core features. You don't need to create an account or enter an email address. The site is supported by non-intrusive display ads, which keeps every tool free for everyone.
Is my data private when using the scientific calculator?
Completely. The scientific calculator runs entirely in your browser using JavaScript — nothing you type or upload is sent to our servers. When you close the tab, your data is gone. This makes it safe for confidential documents, financial figures, and personal information.
Does the scientific calculator work on mobile phones?
Yes. The scientific calculator is built mobile-first and works on any phone or tablet with a modern browser — iPhone (Safari), Android (Chrome), and everything in between. The layout adapts to small screens, so buttons and inputs stay easy to tap on a 375px-wide display.
Do I need to install anything to use the scientific calculator?
No. The scientific calculator works directly in your web browser — no downloads, no extensions, no signup. Just open the page, use the tool, and get your result instantly. It works on Windows, macOS, Linux, ChromeOS, iOS, and Android.