Scientific Calculator
A free online scientific calculator with a textbook-style display: stacked fractions, roots, powers, trig, logs, memory and history. Tap the keys or type on your keyboard.
History
Keyboard
Type numbers and + - * / ^ directly. Enter calculates, Backspace deletes, Esc clears. ← → move the cursor, f makes a fraction.
More calculators
- Quadratic formula calculatorExact roots, vertex, graph and full working
- System of equations calculator2 or 3 equations with exact fractions and steps
- Standard deviation calculatorSample or population, with a step table
- Significant figures calculatorCount, round and calculate with sig fig rules
- Scientific notation calculatorConvert numbers and do math with powers of ten
- All calculatorsSee every tool
How to use this scientific calculator
- Tap the keys or type on your keyboard. The top line shows what you entered, and the lower line previews the answer as you type.
- Press = or Enter to finish. The answer is stored as Ans, so pressing an operator next continues from it.
- Check the angle unit before using trig functions. DEG, RAD or GRAD shows in the corner of the display; the DEG key switches between them.
- Press 2nd to use the functions printed in amber above the keys, such as sin−1, ex and ∛.
- To fix a mistake, move the cursor with ◀ and ▶ (or the arrow keys) and delete or add anything in the middle of the expression. After pressing =, ◀ takes you back into the expression to edit it.
The display shows math the way it looks in a textbook. Fractions stack, square roots draw a bar over what is inside them, and exponents sit up high. Empty boxes show where a number still needs to go.
What each key does
| Key | What it does | Example |
|---|---|---|
| Fraction key | Makes a stacked fraction; type the top, press ▶, then type the bottom | 3/4 + 1/6 → 11⁄12 with S⇔D |
| ◀ and ▶ | Move the cursor through the expression | Fix one digit without clearing everything |
| sin, cos, tan | Trigonometric functions, using the current angle unit | sin(30) = 0.5 in DEG |
| 2nd + sin, cos, tan | Inverse functions that return an angle | sin⁻¹(0.5) = 30 in DEG |
| hyp | Switches sin, cos and tan to sinh, cosh and tanh | sinh(1) = 1.17520119364 |
| ln and ex | Natural logarithm and its inverse | ln(e) = 1 |
| log and 10x | Base-10 logarithm and its inverse | log(1000) = 3 |
| x2 and x3 | Square and cube | 12² = 144 |
| xy and x√y | Any power and any root | 2^10 = 1024, 3ˣ√27 = 3 |
| √ and ∛ | Square root and cube root | √(144) = 12, ∛(−27) = −3 |
| x−1 and x! (2nd) | Reciprocal, and factorial (non-whole numbers use the gamma function) | 4⁻¹ = 0.25, 5! = 120 |
| π and e (2nd) | The constants π ≈ 3.14159 and e ≈ 2.71828 | 2π = 6.28318530718 |
| |x| | Absolute value | abs(−7.5) = 7.5 |
| nCr and nPr (2nd) | Combinations and permutations | 5 nCr 2 = 10, 5 nPr 2 = 20 |
| % | Divides the number before it by 100 | 200 × 15% = 30 |
| ×10x | Enters a power of ten as part of a number, shown as ᴇ | 6.022ᴇ23 × 2 = 1.2044×10²⁴ |
| Ans | The last answer | Ans ÷ 2 |
| MR, M+ (2nd: MC, M−) | Recall, add to, clear or subtract from memory | An M shows in the display while memory holds a value |
| Ran# | Random number from 0 to 1 with three decimal places | Ran# → 0.417 |
| S⇔D | Shows the answer as a fraction or a decimal | 1/3 + 1/7 → 10⁄21 |
Degrees, radians or gradians?
Trig functions depend on the angle unit. In degree mode a full turn is 360, in radian mode it is 2π, and in gradian mode it is 400. Most geometry and physics homework uses degrees; calculus and most programming languages use radians. If sin(90) gives 0.893996663601 instead of 1, the calculator is in radian mode. Press the DEG key until DEG shows in the display.
How the calculator reads an expression
The calculator follows the standard order of operations. It works out parentheses first, then functions such as sin and log, then powers and roots, then multiplication and division from left to right, and finally addition and subtraction.
Three details trip people up. Powers are worked out from right to left, so 2^3^2 is 29 = 512. A leading minus sign applies after the power, so −2² is −4; type (−2)² to get 4. And implied multiplication, such as 2π or 3(4+1), binds more tightly than ÷, so 1÷2π means 1 ÷ (2π) = 0.159154943092. Type 1÷2×π if you want 1.57079632679. Many textbook-display calculators use the same convention.
If you leave parentheses open, they close automatically at the end of the expression.
Keyboard shortcuts
| Key | Action |
|---|---|
| 0–9 . + - * / ^ ( ) | Enter as shown (x also multiplies) |
| Enter or = | Calculate |
| Backspace | Delete the last entry |
| Esc or Delete | Clear everything |
| ← → Home End | Move the cursor |
| f | Insert a fraction |
| s c t | sin, cos, tan |
| l and g | ln and log |
| q or r | Square root |
| p, e, a | π, e and Ans |
| ! and % | Factorial and percent |
Precision and large numbers
Answers show up to 12 significant digits. Behind the display, calculations use double-precision arithmetic and are rounded to 15 significant digits, similar to the internal precision of many handheld scientific calculators. That rounding is why 0.1 + 0.2 gives exactly 0.3 here instead of 0.30000000000000004.
Results of 1012 or more, or smaller than 0.000001, switch to scientific notation, such as 1.2044×1024. To convert between notations or round to a set number of significant figures, use the scientific notation calculator.
More tools
To solve a quadratic equation with every step shown, use the quadratic formula calculator. For cubic equations, systems of equations, mean and standard deviation, integrals, derivatives, complex numbers and binary or hex conversion, open the fx-991CW style calculator. New to scientific calculators? The guide What is a scientific calculator? explains the functions and how to pick a handheld model.
Frequently asked questions
Is this scientific calculator free?
Yes. There is no sign-up, no download and no usage limit.
Does it work on a phone or tablet?
Yes. The keys are sized for touch, and the page works in any modern mobile browser. Add it to your home screen for one-tap access.
Can it show answers as fractions?
Yes. After a calculation, press S⇔D to switch between a decimal and a fraction. Fractions are shown when the answer can be written exactly with a denominator of up to one million.
Where is my calculation history stored?
Only in your own browser, using local storage. Nothing is sent to a server. Press Clear in the History panel, or clear your browser data, to remove it.
Why does sin(90) not equal 1?
The calculator is in radian mode, where 90 means 90 radians. Switch to DEG and sin(90) returns 1.
Can I use this calculator on a test?
Online calculators are usually not allowed during exams. Check your school’s or testing organization’s calculator policy, and practice on the same handheld model you will use on test day.
Last updated September 27, 2026.