The Online Calculator™

Basic Calculator

Calculator Operations

This basic online calculator is similar to a small handheld calculator and has the standard four functions for addition, subtraction, division and multiplication. Like most 4-function calculators it also includes keys for percent, square, square root and pi. This basic calculator has decimal precision up to 10 digits and offers these functions:

mc = Memory Clear: clear calculator memory
m+ = Memory Plus: add displayed value to memory
m- = Memory Minus: subtract displayed value from memory
mr = Memory Recall: display the memory value
CE = Clear Entry: clear current display value, changes to AC
AC = All Clear: clear all and start a new operation
√x = Square Root: take the square root of the displayed value and display it
+/- = Plus/Minus: change the sign of the displayed value from positive to negative or vice versa
π = pi: display the value of π as 3.141592654 to use in a calculation
x² = Square: square the displayed value and display it
R2 = Round to 2 decimals: round the current display value to 2 decimal places such as in money or currency format
R0 = Round to 0 decimals: round off the current display value to 0 decimal places
% = Percent: use displayed value to calculate a percentage

Accessible Calculator Features

Zoom: Increase the size of the calculator in your browser using your browser's zoom feature. The size of the calculator, text and buttons changes proportionately.

Touch Screen Zoom: Increase the size of the calculator on your touch screen by zooming with your fingers. The size of the calculator, text and buttons changes proportionately.

Text Size: In some browsers, such as Chrome desktop, you can change the text size in your browser settings and the size of the calculator, text and buttons will get larger or smaller proportionately.

Keyboard Control: You can use the calculator without a mouse by tabbing among the calculator keys. Press "Enter" when a key is focused. This method can be arduous however, since you must tab through all keys in sequence.

Number Keypad Control: You can use the calculator with with most Number Pads and Keyboards in the most popular browsers for numbers, clear, and the basic functions of addition, subtraction, multiplication, and division and delete/backspace.

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Calculating Percentages

Multiplication and Division will convert the displayed value to a percent in decimal form and complete the operation when you press [=]
- Example: find 20% of 25
- Enter 25 x 20 % and the display changes 20% to 0.2
- Enter = to complete the calculation 25 x 0.2 = 5. The answer 5 shows in the display.
Addition and Subtraction will add or subtract the percentage of a value
- Example: add 20% to 25
- Enter 25 + 20 % and the display changes to 5. (5 is 20% of 25)
- Enter = to complete the calculation 25 + 5 = 30. The answer 30 shows in the display.
Tax Calculation
- Example: add 6% tax to a purchase of $851
- Enter 851 + 6 % and the display changes to 51.06. (51.06 is 6% of 851)
- Enter = to complete the calculation 851 + 51.06 = 902.06. The answer 902.06 shows in the display.
- Note: for other problems you might get an answer with more than 2 decimal places. Use the R2 key to round off to dollars and cents. Use R0 to round off to only dollars.