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Scientific Calculator – Free Online Calculator with Trig and Logs

A full scientific calculator in your browser: sine, cosine and tangent in degrees or radians, inverse trig, logarithms, powers, roots, factorials, π and e, with brackets and a history of your last ten answers. Type on your keyboard or tap the keys.

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How to use the scientific calculator

  1. Tap the keys or type an expression into the display.
  2. Watch the live preview under the expression.
  3. Press = or Enter to finish the calculation. It is added to your history.
  4. Tap a history item to bring that expression back and edit it.

Choose Degrees or Radians before using trigonometric functions. Use AC to clear and ⌫ to delete the last character.

Examples to try

You typeResult
2 + 3 × 414
(2 + 3) × 420
2^101024
sqrt(16) + 5!124
sin(30) (degrees)0.5
log(1000)3
ln(e)1
2π6.283185307
15% × 8012
nCr(10, 3)120

Implicit multiplication works too: 2π, 3(4 + 1) and 2sin(30) are all understood.

Order of operations

The calculator follows the standard mathematical order, often remembered as PEMDAS in the US or BODMAS in the UK and India:

  1. Brackets (parentheses)
  2. Exponents / powers and roots
  3. Multiplication and division, left to right
  4. Addition and subtraction, left to right

Factorials (!) and percentages (%) apply to the number just before them.

Trigonometry tips

  • The trig functions use the angle unit you have selected. A common mistake is calculating sin(30) in radian mode and getting −0.988.
  • tan(90°) is undefined, so the calculator shows an error rather than a huge number.
  • To convert degrees to radians yourself, multiply by π/180; to go the other way, multiply by 180/π.

Logarithms

  • log is the common logarithm, base 10: log(100) = 2.
  • ln is the natural logarithm, base e: ln(e²) = 2.
  • For any other base use log(x, b): log(8, 2) = 3.

Scientific notation and very large numbers

Very large or very small answers are shown in E notation: 6.02e23 means 6.02 × 10²³, and 1.6e-19 means 1.6 × 10⁻¹⁹. You can type numbers the same way, for example 3e8 for the speed of light in metres per second. Factorials grow fast — 170! is the largest one that fits; anything bigger shows as infinity.

Using it for homework and exams

The calculator is handy for checking working, but many exams only allow specific approved calculators, so practise with the one you’ll use on the day too. Write down each step of your working rather than only the final answer — teachers usually give marks for the method. When an answer looks surprising, check the angle mode and the brackets first; those cause most mistakes.

Is my calculation private?

Yes. Everything is calculated in your browser — nothing you type is sent anywhere. For specific jobs there are focused tools: work with fractions in the fraction calculator, solve equations with the quadratic equation solver, handle powers and roots with the exponent calculator, or work out percentages with the percentage calculator.

Frequently asked questions

How do I switch between degrees and radians?

Use the Degrees / Radians switch above the display. In degree mode, sin(30) = 0.5; in radian mode, sin(π/6) = 0.5. Inverse functions such as sin⁻¹ return their answer in the same unit.

What order does the calculator use?

Standard order of operations: brackets first, then powers (right to left, so 2^3^2 = 2^9 = 512), then multiplication and division, then addition and subtraction from left to right. A minus sign in front of a power applies after it: −2^2 = −4.

Can I type instead of tapping keys?

Yes. Click the display and type an expression such as 2(3 + 4)^2 or sqrt(2) * pi, then press Enter. You can also use * for × and / for ÷.

What does Ans do?

Ans inserts the result of your last calculation, so you can carry on from it — for example Ans × 2.

Why does 0.1 + 0.2 show 0.3 here?

Computers store most decimals in binary, which can produce tiny errors like 0.30000000000000004. The calculator rounds results to 14 significant figures to hide this noise.

Which functions are supported?

sin, cos, tan and their inverses, sinh, cosh, tanh, sqrt, cbrt, root(x, n), ln, log (base 10), log(x, b) for any base, log2, exp, abs, round, floor, ceil, factorial (!), percent (%), nCr and nPr, plus the constants π and e.

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