Scientific calculator

Type or tap a calculation. The answer appears as you type, fractions stay exact, and every line you add stays on the tape below, where you can edit it and everything after it updates.

By the Calcist team · Checked against known answers · Updated October 26, 2026

Your calculations

Private: calculated on your device. Nothing you type is sent anywhere.

How to use the scientific calculator

Type naturally. 3(4+5), 2pi, sin 30 and √2 all work. Multiplication can be written as *, × or left out.
Degrees or radians. Use the Deg/Rad switch. If you type sin(90) in radians, the calculator gently asks whether you meant degrees.
Exact answers. When a result is a fraction, you see it as a fraction too: 1/3 + 1/6 gives 0.5 and 1/2.
Name numbers. Type r = 4, then use r later, as in pi*r^2. ans is always the last answer.
Edit the tape. Change any earlier line and every line below it recalculates, like a small spreadsheet.
Keyboard. Start typing anywhere on the page. Enter adds the line, Esc clears it and the up arrow brings back the last line.

Functions you can use

Type	Meaning	Example
`^` or `**`	Power	`2^10` = 1,024
`sqrt( )`, `cbrt( )`, `root(x, n)`	Square, cube and nth roots	`root(32, 5)` = 2
`sin cos tan`	Trigonometry (Deg or Rad)	`sin(30)` = 0.5 in degrees
`asin acos atan`	Inverse trig	`atan(1)` = 45°
`sinh cosh tanh`	Hyperbolic functions	`cosh(0)` = 1
`ln`, `log`, `log(x, b)`	Natural log, base 10, any base	`log(8, 2)` = 3
`!`	Factorial	`6!` = 720
`%`	Percent	`200 + 15%` = 230
`ncr(n, r)`, `npr(n, r)`	Combinations, permutations	`ncr(5, 2)` = 10
`pi`, `e`, `phi`	Constants	`e^1` = 2.718281828…

Order of operations

Calcist follows the standard order: brackets first, then powers, then multiplication and division from left to right, then addition and subtraction. So 2 + 3 × 4 is 14, not 20. A minus sign in front of a power applies after the power, so −2^2 is −4, while (−2)^2 is 4. Powers stack from the right: 2^3^2 is 2⁹ = 512.

Everything is calculated on your own device. Nothing you type is sent anywhere, and your tape is saved only in this browser.

How we checked this

Before every update, this calculator is run in a real browser with these known answers, and it must match all of them:

sin(30°) = 0.5 ✓
log(1000) = 3 ✓
5! = 120 ✓
1/3 + 1/6 = 1/2 exactly ✓

Last checked October 26, 2026. Spotted something wrong? The math is done in your browser with the formula shown on this page, so you can check any result by hand.

Questions people ask

Is this scientific calculator free?

Yes. It's free, needs no account and works on phones, tablets and computers. Once loaded it also works offline.

How do I switch between degrees and radians?

Choose Deg or Rad at the top right of the calculator. Degrees are the default because that's what most homework and everyday problems use.

Why does sin(90) give 0.894 instead of 1?

That's sin of 90 radians. Switch to Deg and sin(90) gives 1. Calcist shows a reminder when a whole-number angle like 30, 45 or 90 is used in radian mode.

Can I see the answer as a fraction?

Yes. When the result is a fraction, such as 1/3 + 1/6, it's shown as a decimal and as a simplified fraction (1/2), plus a mixed number when it's bigger than 1.

How does 200 + 15% work?

Like a shop calculator: adding a percent increases the number by that percent, so 200 + 15% = 230 and 80 − 25% = 60. On its own, 15% means 0.15.

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