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Scientific Calculator

A scientific calculator with trig in degrees or radians, logs, powers, roots and factorials, correct operator precedence, keyboard input and history.

Scientific calculator

ExpressionAngle: degrees (°)

You can type on your keyboard without clicking the input. Enter calculates · Esc clears · ⌫ deletes one character · ^ power · ! factorial. Implicit multiplication like 2π or 3(4) works too.

Memory and history

Memory empty

History

Expressions you calculate with = collect here. Tap one to load it again. History stays on this screen only and is not saved.

Expressions are parsed directly in this browser (no eval), computed in double precision (about 15–17 digits) and shown rounded to 12 significant digits, so 0.1+0.2 shows as 0.3. Precedence: parentheses → functions → factorial and % → powers (right to left) → sign → multiplication and division → addition and subtraction, so −2² = −4 and 2^3^2 = 512. % divides by 100, so 200×15% = 30. In degree mode, values like sin 180° and cos 90° show exactly 0.

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How to use

Everything you enter is processed only in this browser.

Enter an expression with the buttons or your keyboard
Choose degrees or radians and preview the result
Press = to calculate and recall entries from the history

How it works and good to know

Expressions are parsed and evaluated directly, without eval. Precedence is parentheses and functions → factorial and % → powers (right to left) → sign → multiplication and division → addition and subtraction, so −2² = −4. Results are computed in double precision and rounded to 12 significant digits, so 0.1 + 0.2 shows as 0.3. In degrees, sin 180° and cos 90° are exactly 0, while tan 90°, log 0 and square roots of negative numbers are reported as errors. Factorials go up to 170!, and the last 30 history entries stay only on this screen.

Scientific Calculator