How to use this calculator

This calculator handles addition, subtraction, multiplication, and division using the usual algebraic order of operations. It keeps intermediate decimal and fractional values exact, so the displayed exact result does not inherit common binary-addition artifacts. Use the on-screen keypad or type directly.

The method

Parentheses first; multiply and divide before adding and subtracting

Enter the values in the labeled fields, check the units or selected mode, and choose Calculate. The result includes the applicable working and a breakdown or visual when useful. Change an input and calculate again to update the result.

WORKED EXAMPLE

Expression: (12.5 + 7.5) / 4

Calculation result: 5

(12.5 + 7.5) / 4

Scope and limitations

Only numeric arithmetic and parentheses are supported. There are no powers, named functions, variables, or implicit multiplication. The keypad follows algebraic precedence rather than immediate-execution calculator behavior.

Common questions

Why does 2 + 3 * 4 equal 14 instead of 20?

Multiplication happens before addition. Use (2 + 3) * 4 to obtain 20.

Is this approved for an examination?

No examination approval is claimed. Always use the calculator permitted by your examination provider.

References & further reading

External references provide background, not an endorsement of this implementation. See our methodology for numerical conventions and limitations.