Free Online Scientific Calculator
This scientific calculator works right in your browser. It handles trigonometric functions, logarithms, exponents, square roots, and memory keys, and it’s free with no download or sign-up. Type an expression or tap the keys below, switch between degree and radian mode, and check your calculation history whenever you need to double back on a step.
- ✓Free, no sign-up
- ✓Runs in your browser
- ✓Results to 10 significant figures
- ✓Standard order of operations (PEMDAS)
Trigonometry
sin, cos, and tan in both degree and radian mode, switchable with one tap.
Logarithms
Common log (base 10) and natural log (ln), the two most-used log functions in school math.
Roots & Powers
Square roots, exponents (x^y, x squared), factorials, and reciprocal (1/x).
Memory & History
M+/MR/MC memory keys plus a full calculation history you can tap back into.
Scientific Notation
Need to convert or multiply numbers in scientific notation? Try the dedicated tool.
Exact Fractions
Need an exact fraction instead of a decimal? Try the fraction calculator.
Extended Functions: Statistics, Equations, Bases & Matrices
Beyond the main keypad, this calculator also handles descriptive statistics, quadratic equation solving with real and complex roots, base conversion (binary, octal, decimal, hex), and 2×2 matrix operations, addition, multiplication, and determinant.
How to Use This Calculator
Typing works the same way as writing the expression on paper. Enter numbers and operators in order, use parentheses to group parts of a longer expression, and press equals when you’re ready. The Deg and Rad buttons switch the angle mode for trigonometric functions, so check which one your teacher or exam wants before you start. The clock icon opens your calculation history, and the memory keys (M+, MR, MC) hold onto a number across several steps.
How Does This Compare to Other Online Scientific Calculators?
| Tool | Strength | Trade-off |
|---|---|---|
| Desmos | Clean, well-designed interface | No written explanation or FAQ on the page |
| GeoGebra | Very advanced, full function set | Busy layout that can overwhelm a first-time user |
| Calculator.net | Long-standing, easy to find | Minimal on-page explanation of how to use it |
| This calculator | Tool plus plain-language explanations and answers to common questions, in one place | Newer, still expanding advanced modes |
None of the larger sites pair the tool with real explanations on the same page, so you don’t have to leave to understand what a button does or why an answer came out the way it did.
This calculator is checked against standard order-of-operations rules and updated as new functions are added. If you spot a result that looks wrong, use the contact page and let us know what expression you entered.
A scientific calculator handles one expression at a time: trigonometry, logarithms, and other functions, solved and shown as a single result. A graphing calculator does all of that too, plus it can plot equations, show a table of values, and on some models run small programs. Most middle and high school classes only require a scientific calculator; graphing calculators usually get assigned once a course covers functions and graphs, such as Algebra II or Precalculus.
Yes. A calculator follows the standard order of operations, parentheses first, then exponents, then multiplication and division, then addition and subtraction, the same rule you’d use solving by hand. Skip a needed parenthesis and the calculator will still return an answer, just not the one you meant. Adding a parenthesis around any part you want solved first removes the guesswork. Khan Academy’s order of operations lesson walks through more examples if the rule itself still feels shaky.
This calculator shows decimal results, rounded to 10 significant figures. If you need an exact fraction, use the dedicated fraction calculator, which keeps numerator and denominator as whole numbers instead of converting to a decimal.
A scientific calculator speeds up multi-step problems, cuts down on arithmetic mistakes in long calculations, and matches the exact functions most exam boards expect students to know how to use. It doesn’t replace understanding the math itself, teachers still want to see the working, but it removes the risk of one small slip turning a correct method into a wrong final answer.
Estimate between the two perfect squares closest to your number, then narrow in. For 50, you know 7 squared is 49 and 8 squared is 64, so the square root sits just above 7. Try 7.1 squared (50.41), a little high, then 7.07 squared (49.98), close enough for most purposes. This guess-and-check approach, sometimes called the Babylonian method when repeated, is what a calculator automates for you instantly.
Yes. Press the backspace key to remove the last character you typed instead of clearing the whole line. The calculation history panel also keeps every expression you’ve solved during your session, so you can tap an old result and keep building on it instead of retyping numbers from scratch.