What is the difference between Simple and Expert mode?

Simple mode covers everyday arithmetic — add, subtract, multiply, divide, percent, and parentheses-free entry. Expert mode adds scientific functions: sine, cosine, tangent, natural and base-10 logarithms, square root, powers, factorial, parentheses, and the constants π and e, with a degrees/radians toggle.

Does it keep a history of my calculations?

Yes. Every calculation is saved to a history list (stored locally in your browser). Tap any past result to drop it into the current expression. On wide/landscape screens the history shows alongside the keypad; on phones, tap the History button.

Can I use my keyboard?

Yes — type digits and operators directly, press Enter or = to evaluate, Backspace to delete, and Escape to clear.

Is my data sent anywhere?

No. All calculations run entirely in your browser using a safe expression parser (no code is executed), and your history never leaves your device.

Calculator

A fast, full-screen online calculator with two modes — Simple for everyday math and Expert for scientific functions (trig, logarithms, powers, roots, factorial, π and e) — plus a running history you can tap to reuse. Works with your keyboard, and in landscape the history sits right beside the keypad, just like the calculator on your phone.

How to use Calculator

Switch between Simple and Expert mode at the top.
Tap the keys or type with your keyboard; the result previews live.
Press = to calculate — past results are saved in the history panel.

Frequently asked questions

What is the difference between Simple and Expert mode?: Simple mode covers everyday arithmetic — add, subtract, multiply, divide, percent, and parentheses-free entry. Expert mode adds scientific functions: sine, cosine, tangent, natural and base-10 logarithms, square root, powers, factorial, parentheses, and the constants π and e, with a degrees/radians toggle.
Does it keep a history of my calculations?: Yes. Every calculation is saved to a history list (stored locally in your browser). Tap any past result to drop it into the current expression. On wide/landscape screens the history shows alongside the keypad; on phones, tap the History button.
Can I use my keyboard?: Yes — type digits and operators directly, press Enter or = to evaluate, Backspace to delete, and Escape to clear.
Is my data sent anywhere?: No. All calculations run entirely in your browser using a safe expression parser (no code is executed), and your history never leaves your device.

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