What changes the result most
Parentheses and degree/radian mode usually move the result most. For example, sin(30) is 0.5 in degrees but about −0.988 in radians.
Scientific Calculator
Evaluate bounded scientific expressions with functions, constants, powers, factorials, and explicit degree or radian mode—without JavaScript eval.
Runs locallyKeyboard friendlyUpdated: August 30, 2026
Enter your scenario
Results update as valid inputs change. Correct any highlighted field before relying on the answer.
Primary result
Result1
Expressionsin(30)^2 + cos(30)^2
Angle modeDegrees
Scientific notation1.00000000e+0
The restricted expression parser evaluates the entered expression in degrees mode without executing JavaScript.
Use the result
From calculation to decision
Use the scientific calculator to check a bounded numerical expression while keeping the expression and angle unit visible with the result.
What to do next
Change one high-leverage input, compare the new result with the default, and confirm any current rate, policy, quote, or external rule that controls the real decision.
Save and report
Calculation happens in this browser. Shared links include the visible input values, so inspect the URL before sending a sensitive scenario.
If a result appears wrong, report an issue for this calculator.
When this calculation helps
Use the scientific calculator to check a bounded numerical expression while keeping the expression and angle unit visible with the result.
The result separates the primary answer from supporting values so you can see both the number and the assumptions that produced it. Adjust one field at a time when comparing scenarios; changing several inputs together makes it harder to identify why the answer moved.
Formula / methodology
A restricted recursive-descent parser tokenizes numbers, names, parentheses, and declared operators. Exponentiation binds more tightly than multiplication; multiplication binds more tightly than addition. Exponentiation is right-associative.
sin(30)² + cos(30)² = 1 in degree mode
log(1000) = 3
5! = 120
50% = 0.5The parser caps expression length, token count, nesting depth, and factorial range. It never passes the expression to eval or a function constructor.
Assumptions and limitations
- Log means base 10; ln means the natural logarithm.
- Percent is a postfix operator that divides the preceding value by 100.
- Factorial accepts whole numbers from 0 through 170.
- Complex numbers, matrices, variables, implicit multiplication, and symbolic algebra are outside this first version.
Worked examples
Trigonometric identity
In degrees, sin(30)^2 + cos(30)^2 returns 1.
Mixed functions
sqrt(81) + log(1000) + 4! returns 36 because 9 + 3 + 24 = 36.
Common mistakes
- Using degree-sized inputs while radian mode is selected.
- Writing implicit multiplication such as
2piinstead of2*pi. - Using brackets or function names that are not in the supported list.
FAQ
Can an expression run code?
No. Only explicitly recognized mathematical tokens are accepted, and unknown names or characters become an input error.
Why is a very large factorial rejected?
Factorials above 170 exceed the supported finite-number range and are blocked before calculation.
Sources and assumptions
The operator relationships are mathematical identities documented in the Source Guide. The security boundary is part of this calculator’s method: expressions are parsed, not executed as program code.
Updated: August 30, 2026. Method: SCIENTIFIC-1.0. Inputs remain visitor-entered unless a data timestamp is shown beside them.
Calculator-specific review
Decision supported: Evaluate a bounded scientific expression without executing user-supplied JavaScript.
Inputs and two scenarios
The inputs below are scenario controls, not facts supplied by a source. Change the values to see how this calculator responds to the decision you are making.
published default example: Angle mode: Degrees; Expression: sin(30)^2 + cos(30)^2.
materially different higher scientific calculator scenario: Angle mode: Radians; Expression: log(1000) + 4!.
What changes the result
Parentheses, operator order, and degree/radian mode can materially change the result.
Method and evidence boundary
A restricted parser applies declared precedence, constants, functions, degree/radian conversion, percent, and factorial rules. The operators and functions are mathematical identities implemented in the local parser.