Question 1

Does this scientific calculator use eval()?

Accepted Answer

No. It tokenizes and parses the supported mathematical grammar directly, then applies an allowlisted set of constants, operators, and functions.

Question 2

What is the difference between DEG and RAD?

Accepted Answer

DEG uses degrees for direct trigonometric inputs and inverse-trigonometric outputs. RAD uses radians. The relationship is 180 degrees equals pi radians.

Question 3

Why does 200 + 10% equal 200.1?

Accepted Answer

The percent operator divides the preceding value by 100, so 10% is 0.1. Write 200*(1+10%) for a 10% increase, or use the Percentage Calculator.

Question 4

Can it calculate complex numbers or symbolic algebra?

Accepted Answer

No. This version evaluates finite real-number expressions. It does not solve equations, simplify symbols, or return complex-number results.

Question 5

Why can calculator results contain tiny decimal differences?

Accepted Answer

The browser uses finite binary floating-point arithmetic. Many decimal and transcendental values cannot be represented exactly, so the display rounds to useful significant digits.

Question 6

Are calculations saved or uploaded?

Accepted Answer

No. Expressions and results are processed locally in the browser and are not uploaded or permanently stored by the calculator.