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Scientific Calculator Online – Free & Easy to Use

Free online scientific calculator with trig (degrees and radians), logs, powers, roots, factorials, π and e. Type or tap, with history and keyboard support.

  • Free, no sign-up
  • Runs in your browser, nothing uploaded

About the Scientific Calculator

A full scientific calculator in your browser. Type expressions naturally, like 2(3+4)^2 or sin(30), or use the keypad. It supports trigonometry in degrees or radians, logarithms, powers, roots and factorials, and keeps a history of your results.

Key features

  • Trigonometry in degrees or radians, including inverse functions
  • Logarithms (ln, log, log2), powers, roots and factorials
  • Type natural expressions: 2(3+4)^2, sin 30, 5!
  • Live result preview as you type
  • History of results: click to reuse
  • Keyboard friendly: press Enter to calculate

A full scientific calculator in your browser

This calculator handles everything from quick arithmetic to trigonometry, logarithms and factorials. You can type expressions the way you'd write them on paper, including implicit multiplication like 2π or 3(4+1), or use the keypad.

Supported functions

TypeFunctions
Arithmetic+ − × ÷, ^ (power), % (percent), ! (factorial)
Trigonometrysin cos tan asin acos atan (degrees or radians)
Hyperbolicsinh cosh tanh
Logarithmsln (natural), log (base 10), log2
Roots & moresqrt (or √), cbrt, abs, exp, floor, ceil, round
Constantsπ / pi, e, Ans (last result)

Examples

You typeResult
2(3+4)^298
sin(30) (DEG)0.5
sqrt 21.41421356237
log(1000)3
5!120
2^-10.5
ln(e^3)3
asin(1) (DEG)90

Tips

  • Ans inserts the previous result, which is handy for multi-step calculations.
  • Errors explain themselves: dividing by zero, a missing parenthesis or sqrt(-1) show a clear message instead of a wrong answer.
  • tan(90°) is undefined, and the calculator says so rather than returning a huge number.

For percentages use the Percentage Calculator; for fractions, the Fraction Calculator; for unit conversions, the Unit Converter.

How to use the Scientific Calculator

  1. Enter your numbers in the fields above. Units and options can be changed at any time.
  2. The result updates instantly as you type; there's no calculate button to press.
  3. Check the breakdown under the main result for the details behind the number.
  4. Adjust the inputs to compare scenarios, for example a different rate or term.

Frequently asked questions

Why does sin(30) give 0.5 here but -0.988 elsewhere?

Angle mode. sin(30) is 0.5 when 30 is in degrees and about -0.988 when it's in radians. Use the DEG/RAD switch to match your problem.

In what order are operations evaluated?

Standard precedence: parentheses, then powers (evaluated right to left, so 2^3^2 = 512), then multiplication and division, then addition and subtraction. A minus sign in front applies after the power: -2^2 = -4.

What does the % key do?

It divides by 100, so 200 × 10% = 20 and 50% = 0.5.

Why does 0.1 + 0.2 show 0.3?

Computers store decimals in binary, which makes 0.1 + 0.2 = 0.30000000000000004 internally. Results are displayed at 14 significant digits, which removes that noise.

Are these calculators accurate?

They use standard, published formulas (for example the amortization formula for loans, Mifflin-St Jeor for calories and the U.S. Navy method for body fat) and are tested against known reference values. Results are estimates for planning, not professional advice.

Is my data stored?

No. All calculations run in your browser and nothing you enter is sent to a server.

Do the calculators work on my phone?

Yes. Every calculator is designed for mobile, tablet and desktop.

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