# Free Online Calculator 100% Accurate

Online calculator is 100% easy and reliable, providing simple & scientific solutions to all your math problems, and it can be used for daily calculations.

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### How to Perform Calculations Using a Keyboard

• Pressing the numbers on your keyboard will input the corresponding digits in the calculator screen. For example, pressing "4" on your keyboard will input the number "4" in the calculator screen.

• Pressing the following keys on your keyboard will perform the corresponding functions on the calculator:

• "+" key will perform addition
• "-" key will perform subtraction
• "*" key will perform multiplication
• "/" key will perform division
• "%" key will perform percentage calculation
• "(" key will open a bracket for grouping expressions
• ")" key will close a bracket for grouping expressions
• "." key will input a decimal point
• To clear the calculator screen, you can either click on the "C" button on the calculator or press the "Backspace" key on your keyboard.

• To perform complex functions like trigonometric functions, logarithms, or square roots, you can use the second table of buttons labeled "functions-two" on the calculator. To access these functions using your keyboard, you can use the following keys:

• "c" key will perform the cosine function
• "s" key will perform the sine function
• "t" key will perform the tangent function
• "l" key will perform the natural logarithm function
• "g" key will perform the logarithm function with base 10
• "r" key will perform the square root function
• "e" key will input the value of the mathematical constant "e" (approx. 2.718)
• To perform other complex functions like factorial, power, or pi, you can use the first table of buttons labeled "functions-one" on the calculator. To access these functions using your keyboard, you can use the following keys:

• "!" key will perform the factorial function
• "^" key will perform the power function
• "p" key will input the value of the mathematical constant "pi" (approx. 3.14159)
• Finally, to calculate the expression on the calculator screen, you can either click on the "=" button on the calculator or press the "Enter" key on your keyboard. The result will be displayed on the calculator screen.

### How to Perform Calculations Using a Mouse/Touchpad

• To use the calculator, click on the buttons with your mouse or touchpad.
• The "numbers" buttons (0-9) will input the corresponding digit into the calculator screen.
• The "basic-stuff" buttons (+, -, x, ÷) will input the corresponding mathematical operation into the calculator screen.
• The "%" button will input the percentage sign into the calculator screen.
• The "." button will input a decimal point into the calculator screen.
• The "triggers" button (=) will calculate the result of the expression that is currently on the calculator screen.
• The "clear" button (C) will clear the calculator screen.
• The "complex-stuff" buttons provide additional functions such as trigonometric functions (cos, sin, tan), logarithmic functions (log, ln), square root (√), pi (π), and more. Clicking on these buttons will input the corresponding function into the calculator screen.
• The "<=" button is a backspace button that will remove the last input from the calculator screen.
• The "x !" button will calculate the factorial of the current number on the calculator screen.
• The "x^" button will raise the current number on the calculator screen to a power specified by the user.
• The "x²" and "x³" buttons will calculate the square and cube of the current number on the calculator screen, respectively.
• The "±" button will toggle the sign of the current number on the calculator screen.
• The "e" button will input the mathematical constant "e" (Euler's number) into the calculator screen.
• The "rad" and "∘" buttons will switch between radians and degrees when calculating trigonometric functions.