Scientific Calculator
Trig, logs, powers, roots, factorial, π & e — with DEG/RAD.
A free online scientific calculator with a full keypad: trigonometry (sin, cos, tan and their inverses), logarithms, powers, roots, factorial, π and e. Switch between degrees and radians, watch a live result preview as you build the expression, and use it with your mouse or keyboard. Expressions are parsed safely (never executed) and everything runs in your browser — nothing is uploaded.
How to use Scientific Calculator
Build your expression
Tap digits, operators and functions to build a full expression — for example sin(30) + logb(81, 3) — right in the display.
Choose DEG or RAD
Switch between degrees and radians for trigonometry, and use INV for inverse functions like sin⁻¹.
Use memory or Ans
Store a value with MS, recall it with MR, or press Ans to drop your last result into a new calculation.
Press equals
Hit = (or Enter) to evaluate. The answer is added to the history panel and becomes the new starting value.
Reuse from history
Tap any result in the History panel to insert it, or copy the current result with the copy button.
Frequently asked questions
Is this scientific calculator free?
Yes — it's completely free with no sign-up and no limits. It runs entirely in your browser, so there's nothing to install and nothing you type is ever uploaded.
What's the difference between DEG and RAD?
DEG (degrees) and RAD (radians) are two ways of measuring angles. Trigonometric functions like sin, cos and tan give different results depending on the mode — for example sin(30) is 0.5 in degrees but about -0.988 in radians. Pick the mode your problem uses; the toggle is at the top of the calculator.
How do the multi-argument functions work?
Some functions take two values separated by a comma: mod(a, b) is the remainder of a÷b, root(x, n) is the nth root of x, logb(x, b) is the logarithm of x to base b, and gcd/lcm/hypot take two numbers. Tap the function key, type the first value, press the comma key, type the second and close the bracket.
What do the memory keys and Ans do?
MS stores the current value in memory, MR recalls it, M+ and M− add or subtract the current value to/from memory, and MC clears it (an 'M' shows when memory is in use). Ans inserts your most recent answer, which is handy for chaining calculations.
Is my history saved?
Your calculation history is saved locally in your browser, so it's still there when you come back — and you can clear it any time with the Clear button. Nothing is sent to a server.
How accurate are the results?
Calculations use your device's standard double-precision maths, the same as most calculators and spreadsheets. Tiny floating-point rounding is cleaned up in the display, and very large or very small answers are shown in scientific (exponential) notation.
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