How to use this calculator
Use the keypad for addition, subtraction, multiplication, division and a percentage of an amount. Enter the first number, select an operation, enter the second number and press equals.
How to use the result
This calculator applies one selected operation to two numbers. Entering another operator can finish the current calculation before starting the next one. It does not parse a typed expression with parentheses and operator precedence; use the Scientific Calculator for that.
The percent operation computes the first value multiplied by the second value, divided by 100. Clear resets the current calculation; backspace removes a digit.
Assumptions and limits
Division by zero or another nonfinite result displays an error. Decimal calculations use browser floating-point arithmetic, so long decimals can include representation artifacts.
Worked example
Enter 200, choose %, enter 15 and press equals to calculate 15% of 200: the result is 30.