Basic Calculator

Four-function and scientific calculator with parentheses, exponents, and keyboard input.

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Show result as

This calculator evaluates a full expression at once rather than computing step-by-step like a simple four-function calculator — it respects standard order of operations (exponents before multiplication/division before addition/subtraction), and parentheses override that order. Type an expression using the buttons or your keyboard, then press = or Enter to evaluate.

The scientific functions row adds trigonometry (sin, cos, tan and their inverses), roots and logarithms (√, ln natural log, log base-10), the constants π and e, and percent. Trig functions use the Deg/Rad toggle — switch to Rad if you're working in radians. Percent (%) is a postfix operator that divides the preceding number by 100, so 50% becomes 0.5 and 50%+1 evaluates to 1.5.

It also has the hyperbolic functions sinh, cosh and tanh (these take a plain number, so the Deg/Rad toggle does not affect them), factorial (n!, written after the number: 5!), absolute value (|x|), any root (ⁿ√x, written nthroot(x, n) — so nthroot(27, 3) is the cube root of 27), a reciprocal key (1/x, which wraps the whole expression) and round, floor and ceil for whole numbers.

The Decimal / Fraction switch changes how the result is shown. In Fraction mode, a result that is exactly a fraction is shown with =, as = 3/4. A result that is not, like π, is shown as the nearest fraction with a denominator up to 1000, marked ≈ so it is never mistaken for the exact value.

Keyboard support: digits, + - * / ^ ( ) % ! ,, Enter to evaluate, Backspace to delete the last character, and Escape to clear. Recent calculations are saved to this browser (not sent anywhere) — click one to recall its result and keep calculating.

Worked examples:

2+3*4 → 14 (multiplication before addition)
(2+3)*4 → 20 (parentheses override order)
2^10 → 1024
sin(90) in Deg mode → 1
sqrt(16) → 4
5! → 120
nthroot(-8, 3) → -2
round(-2.5) → -3 (halves round away from zero)
1/3 in Fraction mode → = 1/3
pi in Fraction mode → ≈ 3 16/113

Does this calculator respect order of operations?

Yes. Exponents are evaluated before multiplication and division, which are evaluated before addition and subtraction — for example, 2+3*4 evaluates to 14, not 20. Wrap part of an expression in parentheses to force it to evaluate first, e.g. (2+3)*4 = 20.

How do I switch between degrees and radians?

Use the Deg/Rad toggle at the top of the calculator. It affects the trig functions (sin, cos, tan, and their inverses) — sin(90) is 1 in Deg mode but 0.894 in Rad mode, since 90 radians is not the same angle as 90 degrees. The hyperbolic functions sinh, cosh and tanh take a plain number rather than an angle, so the toggle does not change them.

Can I use my keyboard instead of clicking buttons?

Yes — type digits and operators (+ - * / ^ ( ) % ! ,) directly, press Enter or = to evaluate, Backspace to delete the last character, and Escape to clear the expression.

Can I see the answer as a fraction?

Yes. Switch "Show result as" to Fraction. 0.75 is shown as = 3/4 and 1/3 as = 1/3. A number that is not exactly a fraction, such as π or √2, is shown as the closest fraction with a denominator of at most 1000, after ≈ rather than =, so π appears as ≈ 3 16/113. The value you keep calculating with is always the full decimal.

What is the factorial of 2.5, or of a negative number?

This calculator refuses both and says so, rather than showing a number. Factorial here counts arrangements, so it takes whole numbers from 0 to 170; 171! is too large to hold, and the calculator tells you that instead of showing infinity. It does not use the gamma function, which would give 2.5! a value.

How do I take a cube root, or any other root?

Press ⁿ√x and type the number, a comma, then the root: nthroot(27, 3) is 3. A negative number has a real cube root, so nthroot(-8, 3) is -2, but an even root of a negative number is not a real number, so nthroot(-16, 4) shows an error.

How does round treat halves?

Halves round away from zero, as on most calculators and spreadsheets: round(2.5) is 3 and round(-2.5) is -3. floor rounds down and ceil rounds up, so floor(-2.1) is -3 and ceil(-2.7) is -2.

Is my calculation history saved anywhere?

History is saved only in this browser via localStorage — nothing is sent to a server. Click any past calculation to recall its result and continue calculating from there, or use the Clear button to erase your history.

Updated October 12, 2026