Scientific Calculator
Type a whole expression rather than pressing one key at a time: 2*sin(45) + log(100) + sqrt(16) evaluates as written. Trigonometry works in degrees or radians, and when something is wrong you are told which bracket or name caused it instead of getting a bare error.
Enter an expression
How to use this calculator
- Type the whole expression rather than pressing one key at a time —
2*sin(45) + log(100)works as written. - Set Degrees or Radians before you calculate. It changes what sin, cos and tan mean.
- Press Calculate. The last ten results are kept below the form.
What it understands
Operators — + − * / % (remainder) and ^ (power), with the usual precedence and brackets to override it. Powers are right-associative, so 2^3^2 is 29 = 512, not 64.
Functions — sin, cos, tan, asin, acos, atan, sinh, cosh, tanh, ln, log (base 10), log2, sqrt, cbrt, abs, exp, floor, ceil, round, sign.
Constants — pi and e.
Numbers — ordinary decimals and scientific notation such as 2.5e-3.
Note that a leading minus binds less tightly than a power, following normal mathematical convention: -2^2 is −4, because it means −(2²). Write (-2)^2 for 4.
How the expression is evaluated
The expression is broken into tokens, converted to postfix form with the shunting-yard algorithm, and evaluated on a stack. It is never handed to the browser's JavaScript engine.
That matters for safety as much as correctness. Passing whatever someone types into eval is a well known way to let a page run arbitrary code, and this site's Content-Security-Policy forbids it outright. A real parser also lets the calculator give a useful message — which bracket is unmatched, which name it did not recognise — instead of a generic syntax error.
Frequently Asked Questions
Almost always the angle mode. In Degrees, sin(45) is about 0.7071; in Radians it is about 0.8509. The mode is shown with every result so you can check which one was used.
log is base 10 and ln is base e, with log2 provided for base 2. For any other base use the change of base rule: log base b of x equals ln(x) divided by ln(b). For example log base 3 of 81 is ln(81)/ln(3), which is 4.
Use ^ for powers, so 2^10 is 1024. For roots use sqrt for square roots and cbrt for cube roots, or a fractional power: x^(1/5) is the fifth root of x. Remember the brackets around the fraction.
Because a power binds more tightly than a leading minus sign, so -2^2 means -(2 squared). This is the standard mathematical convention and matches what most textbooks and programming languages do. Write (-2)^2 if you want 4.
Yes. Write 2.5e-3 for 0.0025 or 1e6 for a million. Very large and very small results are returned in the same form.