Scientific Calculator

Evaluate a typed or tapped expression with trig, logs, powers and factorials — set degrees or radians before you press sin, and expect a blank instead of Infinity on illegal input.

How to use

Set Degrees or Radians before any trig function.
Type or tap the expression. Functions need parentheses: sin(30), not sin30.
Read the finite result. Illegal operations stay empty.
Use the dedicated log, root or quadratic pages when you want a single identity explained in prose.

How it works

This is a general expression evaluator, not one formula. Precedence is ordinary algebra: × and ÷ before + and −. Exponentiation associates to the right, so 2^3^2 is 2^(3^2) = 512, not (2^3)^2 = 64. Unary minus binds after powers: −2^2 is −4. Write (−2)^2 for +4.

log is base 10; ln is base e. In degree mode sin(30) = 0.5; in radians use sin(pi/6). tan(90°) is undefined and is rejected. Even roots of negatives and division by zero are also rejected — no Infinity, no NaN.

Factorial is defined for integers 0 through 170. 0^0 is undefined. The parser is not JavaScript eval; you cannot call browser APIs.

If the job is only a logarithm, a quadratic or a single root, the specialist pages document the identity more clearly. This page is for mixed homework lines.

Percent and fraction buttons are not here: 20% of 80 is the percentage calculator, 3/8 as a decimal is the fraction-to-decimal page. Angle mode is sticky for the session of the widget — check it when you switch from a geometry worksheet (degrees) to a calculus line (radians).

Formula

2×3+4 = 10
2^3^2 = 2^(3^2) = 512
−2^2 = −(2^2) = −4
sin(θ) uses degrees or radians from the angle-mode control

Worked examples

Mixed arithmetic
2*3+4 → 10
Sine in degrees
sin(30) with angle mode = degrees → 0.5

Expressions that surprise people

Typed	Result	Why
2*3+4	10	Multiply first
2^3^2	512	Right-associative tower
-2^2	−4	Minus after the power
sin(30)	0.5	Degrees mode
log(1000)	3	Common log
5!	120	Integer factorial

Useful notes

Not JavaScript eval.
Trig mode is a global switch — check it before sin/cos/tan.
Illegal results stay empty instead of Infinity.

FAQ

Is this in degrees or radians?: Whichever you select. The default is degrees, so sin(30) is 0.5. Switch to radians for sin(pi/6).
What does log mean here?: log is log base 10. Use ln for the natural logarithm, or open the log calculator if you want a custom base.
Why is −2^2 equal to −4?: Exponentiation binds tighter than the leading minus, so the expression is −(2²). Write (−2)^2 if you want +4.
What is 2^3^2?: 512, because the towers evaluate from the top: 2^(3^2).
Why is tan(90) blank in degree mode?: The tangent has a vertical asymptote at 90°. The page refuses Infinity.

Related tools

See all Math tools.