CASIO-style Scientific Calculator
A free online scientific calculator styled after the familiar CASIO fx layout, with trigonometry, logarithms, powers, roots, factorials and π/e. Nothing to install.
CASIO-style Scientific
Press SHIFT, then a key, for the small orange function (SHIFT then sin gives sin⁻¹). After =, S⇔D switches an exact answer between decimal and fraction. You can also type on your keyboard.
Enter an expression using the keypad or your keyboard.
How It Works
This is a free, install-free scientific calculator with a Casio-style key layout, running entirely in your browser. Each key has a main and a SHIFT function: press SHIFT, then the key (SHIFT then sin gives sin⁻¹). It covers trigonometry in degrees, radians or gradians, logarithms, powers, roots, factorials, nCr and nPr, a previous-answer key (Ans) and a memory (M+, M−, MR, MC). When an answer is exactly a fraction, the S⇔D key switches it between decimal and fraction. It understands implied multiplication such as 2π and 3sin(30), lets you leave closing brackets off, accepts keyboard input and keeps a history of your last 20 calculations. Results use standard order of operations. It is an independent tool, not affiliated with Casio, and not a copy of any specific model. Always check your exam's calculator policy before relying on any online tool.
Formula
Order of operations: functions and ! first, then ^, then implied multiplication, then nCr and nPr, then × ÷, then + −. log = base 10, ln = natural log. nPr = n!/(n−r)!, nCr = n!/(r!(n−r)!). % divides by 100.
Examples to Try
Press the keys shown and compare with the result. The angle mode is degrees unless stated.
| Calculation | Keys | Result |
|---|---|---|
| sin(30), degrees | sin 3 0 = | 0.5 |
| sin⁻¹(0.5), degrees | SHIFT sin 0 . 5 = | 30 |
| sin(100), gradians | DEG (until GRA) sin 1 0 0 = | 1 |
| 5 nCr 2 | 5 SHIFT n! 2 = | 10 |
| 52 nCr 5 | 5 2 SHIFT n! 5 = | 2598960 |
| 5 nPr 2 | 5 SHIFT xʸ 2 = | 20 |
| 2π | 2 π = | 6.28318530718 |
| (1 + 2)(3 + 4) | ( 1 + 2 ) ( 3 + 4 ) = | 21 |
| 1.5 × 10³ | 1 . 5 ×10ˣ 3 = | 1500 |
| 200 × 15 % | 2 0 0 × 1 5 % = | 30 |
| 10³ (10 to the power 3) | SHIFT log 3 = | 1000 |
| 5! | 5 n! = | 120 |
| 1 ÷ 3 + 1 ÷ 6, as a fraction | 1 ÷ 3 + 1 ÷ 6 = S⇔D | 0.5 = 1/2 |
| 0.1 + 0.2, as a fraction | 0 . 1 + 0 . 2 = S⇔D | 0.3 = 3/10 |
| 7 ÷ 3, as a mixed number | 7 ÷ 3 = S⇔D SHIFT S⇔D | 2.33333333333 = 2 1/3 |
You can also type on your keyboard after clicking the calculator: digits, + − * / ^ ( ) ! %, Enter for =, Backspace to delete and Escape to clear.
What This Calculator Does Not Do
This is a straightforward scientific calculator, not a full graphing or CAS model. It gives exact fraction answers with S⇔D, but it has no natural (textbook-style) display, SOLVE, tables, matrices, vectors, complex numbers, statistics mode or base conversion. For some of those, these tools do the job:
- Fraction calculator: add, subtract, multiply and divide fractions and mixed numbers step by step.
- Quadratic equation solver: roots, discriminant and vertex of ax² + bx + c = 0.
- Derivative calculator: symbolic differentiation.
- Standard deviation calculator: mean, variance and standard deviation of a data set.
- LCM and GCD calculator: with prime factorisation.
- Percentage calculator: percent of, percent change and more.
Frequently Asked Questions
Is this the same as a real Casio calculator?
No. It is an independent, free tool with a similar key layout, not affiliated with Casio and not an emulator of any specific model. It has no natural (textbook-style) display, SOLVE, tables, matrices, vectors, complex numbers, statistics mode or base-n mode. The sections below point to other MoreCalculators tools for several of those.
How do I use the SHIFT key?
Press SHIFT once, then press the key you want. The small orange label above a key is its SHIFT function: SHIFT then sin gives sin⁻¹, SHIFT then x² gives √, SHIFT then log gives 10ˣ, and SHIFT then n! gives nCr. SHIFT applies to the next key only.
How do I get a fraction answer (S⇔D)?
Calculate with the ÷ key, for example 1 ÷ 3 + 1 ÷ 6 =, then press S⇔D. When the result is exactly a fraction, the display switches between decimal and fraction (0.5 and 1/2). SHIFT then S⇔D shows mixed numbers, so 7/3 becomes 2 1/3. Results that involve π, the square root of a non-square number, logs or trigonometry have no exact fraction, and the key tells you so.
Does it keep a history of my calculations?
Yes. The last 20 calculations are listed next to the keypad, newest first. Click one to bring the expression back and edit or repeat it. The list is saved in your browser on this device only, and Clear removes it.
How do I switch between degrees, radians and gradians?
Press the angle key (it shows DEG, RAD or GRA) to cycle through the modes. The current mode is shown on the display. Trigonometric functions use it: sin(30) is 0.5 in degrees mode, and sin(100) is 1 in gradians mode.
How do I calculate nCr and nPr?
Type the first number, press SHIFT then n! for nCr (or SHIFT then xʸ for nPr), then type the second number and press =. For example 5 nCr 2 is 10, 5 nPr 2 is 20, and 52 nCr 5 is 2,598,960.
How do the Ans and memory keys work?
After you press =, the answer is kept in Ans at full precision, and starting with an operator such as × continues from it. M+ adds the current value to memory, SHIFT then M+ subtracts it, MR inserts the memory value and SHIFT then MR clears it. An M appears on the display while the memory holds a value.
How does the % key work?
It divides the number before it by 100. So 200 × 15 % is 30, and 50 % is 0.5. A sum such as 200 + 10 % gives 200.1, because the percent is applied to the 10 only; to add 10% to 200, calculate 200 × 1.1 or 200 + 200 × 10 %.
Can I use this in an exam?
Check your exam's calculator policy first. Many exams require a specific approved physical calculator and do not allow phones, laptops or web tools. This tool is best for homework, practice and quick checks.
Is it free to use?
Yes. It is free, runs in your browser, and needs no download, account or sign-up.