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How to use this scientific calculator
This calculator writes your sum the way a textbook does. Fractions stack, roots get a proper radical sign and powers sit up high, so you can read your input back and spot a misplaced bracket before you press equals.
- Tap the keys or type on your keyboard. Digits and
+ - * /work as expected,^opens a power, Enter gives the result and Esc clears everything. - Use the arrow keys to move the cursor and fix one number instead of retyping the whole line. Backspace removes the piece in front of the cursor.
- Press S⇔D to flip an answer between its exact form and a decimal. Sine of 60 degrees shows as √3/2, and one press turns it into 0.8660254038.
- Press SHIFT for the gold functions printed above the keys (sin⁻¹, x³, STO and more) and ALPHA for the red letters used as variables.
- Open the gear key to pick degrees, radians or gradians, and the number format: Norm, Fix, Sci or Eng.
- Tap any line in History to reuse it. You can copy the list or save it as a .txt file.
On a wide screen extra keys appear for hyperbolic functions, nPr, nCr, Pol, Rec, random numbers and more. Everything runs in your browser and nothing you enter is uploaded.
Why the order of operations matters
The calculator follows the standard order: brackets, then powers, then multiplication and division, then addition and subtraction. A few cases catch people out, so it helps to know what to expect.
| You type | Result | Why |
|---|---|---|
| 2 + 3 × 4 | 14 | multiplication goes first |
| −2² | −4 | the power binds tighter than the minus |
| (−2)² | 4 | brackets change the base |
| 2^−2 | 1/4 | a negative exponent flips the fraction |
| 6 ÷ 2(1 + 2) | 1 | 2(1 + 2) is read as one factor |
| 5! | 120 | 5 × 4 × 3 × 2 × 1 |
| 0.5! | 0.8862269255 | gamma function for non-integers |
The 6 ÷ 2(1 + 2) line is the famous one. Writing a number straight against a bracket binds tighter than a division sign here, so you get 1. If you meant the other reading, type (6 ÷ 2) × (1 + 2) and you get 9. When a sum will be read by someone else, extra brackets cost nothing.
Degrees or radians
Trig answers depend on the angle unit more than anything else. In degree mode sin(30) is 1/2 and cos(45) is √2/2. In radian mode the same answers come from sin(π/6) and cos(π/4). If an answer looks off, check the unit at the top of the screen first. Inverse functions come from SHIFT, so asin(0.5) returns 30 in degrees. For angles written as 12°30′, press the °′″ key once for degrees, twice for minutes and three times for seconds. That entry equals 25/2, and SHIFT plus the key turns 12.5 back into 12°30′0″.
Worked examples
| Task | Input | Result |
|---|---|---|
| Combinations | 10 nCr 3 | 120 |
| Permutations | 8 nPr 3 | 336 |
| Simplify a root | √8 | 2√2 |
| Natural log | ln 10 | 2.302585093 |
| Compound growth | 100 × 1.05^10 | 162.8894627 |
| Complex product | (1 + 2i)(3 − i) | 5 + 5i |
| Quadratic x² − 4x + 1 = 0 | Equation mode, 1, −4, 1 | 2 − √3 and 2 + √3 |
The quadratic shows the exact roots first. Press S⇔D to see them as 0.2679491924 and 3.732050808. In Statistics mode, the data 2, 4, 4, 4, 5, 5, 7, 9 gives a mean of 5, a population standard deviation of 2 and a sample standard deviation of 2.138089935. Enter the pairs (1, 2.1), (2, 3.9), (3, 6.2), (4, 7.8), (5, 10.1) with linear regression and you get y = 0.05 + 1.99x with a correlation r of 0.9986517556.
The modes
The tabs above the keys switch the workspace. Calculate is the everyday screen with CALC, SOLVE, integrals, derivatives and sums. Complex handles rectangular and polar forms. Base-N works in binary, octal, decimal and hexadecimal with and, or, xor and not. Equation solves linear systems of 2 or 3 unknowns and polynomials up to degree 4. Statistics takes one or two variables with seven regression types. Matrix and Vector cover determinants, inverses, dot and cross products. Table lists f(x) over a range.
Beside the keys you will find about 40 physical constants and 40 unit conversions. Tap one to insert it into the line you are writing.
Keyboard shortcuts
| Key | Action |
|---|---|
| Enter or = | calculate |
| Esc | clear everything (AC) |
| Backspace | delete the piece before the cursor |
| Arrow keys | move the cursor, or step through earlier lines |
| ^ | open a power |
| Letters | type function names such as sin or ln, and variables |
| Ctrl+C | copy the result |
The tool is meant for homework, exam practice and everyday engineering work. If your exam bans certain calculators, check the rules before you rely on any online tool.
Frequently asked questions
How do I get an answer as a fraction or with a square root?
Type the expression and press = . If the result is exact, such as sin 60 giving √3/2 or 1/3 + 1/6 giving 1/2, it is shown in that form. Press S⇔D to switch between the exact form and the decimal, 0.8660254038 in the sine example. Results that came from decimal input or the % key stay decimal until you press S⇔D.
Why is my sine or cosine answer wrong?
Almost always the angle unit. The calculator starts in degrees, so sin(30) is 1/2. If your textbook works in radians, open the settings (the gear key) and switch to RAD, where sin(π/6) is also 1/2. GRA is there for gradians. The unit is shown at the top of the screen.
How do I use inverse functions like arcsin?
Press SHIFT, then the function key. SHIFT + sin gives sin⁻¹, so asin(0.5) returns 30 in degrees mode. The gold label above each key tells you what SHIFT does, and the red label is what ALPHA does (letters A to F, X, Y, M).
What does 6 ÷ 2(1 + 2) give here?
It gives 1. Multiplication written without a sign, as in 2(1 + 2), binds tighter than a division sign, which is how most scientific calculators read it. If you want the other reading, type (6 ÷ 2) × (1 + 2) and you get 9. Adding brackets removes the doubt for whoever reads your work.
How do I solve an equation such as x² − 4x + 1 = 0?
Two ways. In Equation mode choose the quadratic option and enter the coefficients 1, −4 and 1 to get 2 − √3 and 2 + √3. Or type the equation with the = key (ALPHA + CALC), press SOLVE and give a starting guess. SOLVE finds one root near the guess, so try a second guess to find the other.
Can it do integrals, derivatives and sums?
Yes, with numeric methods. The integral key gives a ∫ template for the function, lower and upper limit, d/dx evaluates a derivative at a point, and Σ adds a series. Results are accurate to about nine or ten digits for well behaved functions. Very spiky or discontinuous functions can need smaller intervals.
How do I enter degrees, minutes and seconds?
Press the °′″ key once for degrees, again for minutes and a third time for seconds, so 12 ° 30 ′ = gives 25/2 (12.5 degrees). SHIFT + that key converts a result back, and 12.5 becomes 12°30′0″. On a keyboard you can type the apostrophe and the double quote.
Does it work offline and is my data private?
The calculations run in your browser, so nothing you type is sent to a server. Your history and settings are saved only on your own device, and you can clear them from the History panel. Once the page has loaded it keeps working if your connection drops.