Online Scientific Calculator
Full scientific calculator with trigonometry, logs, powers, roots, memory keys and a running history tape. Works with your keyboard.
How to use it
- Type with your keyboard or click the keys — both work.
- DEG/RAD switches the angle mode for sin, cos and tan.
- Every result is added to the history tape; click any line to reuse it.
This is a full scientific calculator in the browser — trigonometry, logarithms, exponents, roots, factorials, constants and memory registers, with a running tape so you can retrace how you got an answer rather than trusting a single line.
Trigonometry: DEG vs RAD
sin, cos and tan read the angle mode switch. DEG treats input as degrees (sin 30 = 0.5), RAD treats it as radians (sin(π/2) = 1). This is the single most common source of a 'wrong' scientific-calculator answer — a correct calculation in the wrong mode. Check the mode indicator before trusting a trig result.
Logs, powers and roots
log is base 10, ln is the natural log (base e). x^y raises x to any power, including fractional and negative exponents; √ and the general nth-root cover roots beyond square root. x! computes factorial for non-negative integers.
Memory keys and the history tape
M+ and M− add to or subtract from a stored memory value, MR recalls it, MC clears it — the standard set for running a subtotal through a longer calculation. Every result you produce also lands on the history tape, and clicking a past line pulls its value back into the display, so you can build a calculation up from earlier results without retyping them.
Questions people ask
Does it follow order of operations?
Yes. Expressions are parsed with standard precedence — powers first, then multiply and divide, then add and subtract. Use brackets to override it.
Last updated 17 August 2026