Zoom: Increase the size of the calculator in your browser using your browser's zoom feature.
% = Percent: use displayed value to calculate a percentage. R0 = Round to 0 decimals: round off the current display value to 0 decimal places. R2 = Round to 2 decimals: round the current display value to 2 decimal places such as in money or currency format. x² = Square: square the displayed value and display it. π = pi: display the value of π as 3.141592654 to use in a calculation. +/- = Plus/Minus: change the sign of the displayed value from positive to negative or vice versa. √x = Square Root: take the square root of the displayed value and display it. AC = All Clear: clear all and start a new operation. CE = Clear Entry: clear current display value, changes to AC. mr = Memory Recall: display the memory value. m- = Memory Minus: subtract displayed value from memory. 
m+ = Memory Plus: add displayed value to memory. mc = Memory Clear: clear calculator memory. 
This basic calculator has decimal precision up to 10 digits and offers these functions: Like most 4-function calculators it also includes keys for percent, square, square root and pi. This basic online calculator is similar to a small handheld calculator and has the standard four functions for addition, subtraction, division and multiplication.
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