In the Calculator app on your Mac, choose an option from the View menu. Basic: Perform simple arithmetic operations. Scientific: Use memory functions and perform advanced calculations involving fractions, powers, roots, exponents, logarithms, trigonometry, and more. Programmer: Perform binary, octal, decimal, and hexadecimal calculations, including bitwise operations. An ordinary simple calculator as a widget A Simple Calculator for your opera mac version, download the widget from developer page and start to use this simple and usefull calculator.The calculator widget gives you all the functions you'd expect: division, multiplication, addition, subtraction, square root, memory, and percent.

Large, easy and convenient online calculator

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Use for work, school or personal calculations. You can make not only simple math calculations and calculation of interest on the loan and bank lending rates, the calculation of the cost of works and utilities.

Commands for the online calculator you can enter not only the mouse, but with a digital computer keyboard. Detailed instructions for using the calculator, see below.

Instructions for using the online calculator

Keys function

[ 0 ], [ 1 ], [ 2 ], .. [ 9 ] - standard number keys;
[ 00 ] - key input 2 zeros;
[ → ] - remove the last character on the display;
[ +/- ] - change the mathematical sign of;
[ X^Y ] - calculation of X to the power of Y;
[ √ ] - calculate the square root;
[ + ] - addition, [ - ] - subtraction, [ х ] - multiplication, [ ÷ ] - division;
[ % ] - calculates percentages;
[ M+ ] - stored in the memory with the sign [ + ];
[ M- ] - stored in the memory with the sign [ - ];
[ MR ] - get the contents of memory;
[ MC ] - erases the memory content;
[ AC ] - reset the calculator and reset the memory;
[ C ] - resets the calculator without resetting the memory.

Examples of calculations on the online calculator

Calculate the square root of 529: 529 [ √ ]. The result is equal to 23.
Raise the number 3 to a power 4: 3 [ X^Y ] 4 [ = ]. The result is equal to 81.
Calculation of percentage of the number of: 500 [ х ] 25 [ % ]. The result is equal to 125.
Calculating what percent is one number of another number: 25 [ ÷ ] 500 [ % ]. The result is equal to 5(%).
Adding percentage to the number: 500 [ + ] 25 [ % ]. The result is equal to 625.
Deduction percentage of the number: 500 [ - ] 25 [ % ]. The result is equal to 375.

Enter commands from the keyboard PC/Mac

To use free online calculator you can use both ordinary numeric buttons at the top of a keyboard and numeric buttons on the right of a keyboard.

To enter [ = ] - key [Enter].
To erase the last character - [Backspace] (arrow keys).
To enter [ + ] - key [ + ] at the top or [ + ] key on the numeric keypad on the right.
To enter [ - ] - key [ - ] at the top or [ - ] key on the right.
To enter [ x ] (multiplication) - key [ * ] on the numeric keypad on the right or a combination of keys[ * ] and [ Shift ].
To enter [ ÷ ] (divide) - key [ / ] on the numeric keypad on the right or a combination of keys [ : ] and [ Shift ].

Frequently asked questions about the calculator

Why do we get 8 when trying to calculate 2+2x2 with a calculator?

Calculator performs mathematical operations in accordance with the order they are entered. You can see the current math calculations in a smaller display that is below the main display of the calculator.

Calculations order for this given example is the following: 2+2=4, subtotal - 4. Then 4x2=8, the answer is 8.

The History of calculators

The ancestor of the modern calculator is Abacus, which means 'board' in Latin. Abacus was a grooved board with movable counting labels (stones or bones).

Presumably, the first Abacus appeared in ancient Babylon about 3 thousand years BC. In Ancient Greece, abacus appeared in the 5th century BC.

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Use Calculator to perform basic, advanced, or programmer calculations. If your Mac has a Touch Bar, you can easily do quick calculations—without even moving the pointer.

Tip: To learn a key’s function, hold the pointer over the key to see its help tag.

Change the calculator

In the Calculator app on your Mac, choose an option from the View menu:
- Basic: Perform simple arithmetic operations.
- Scientific: Use memory functions and perform advanced calculations involving fractions, powers, roots, exponents, logarithms, trigonometry, and more.
- Programmer: Perform binary, octal, decimal, and hexadecimal calculations, including bitwise operations. You can also view the ASCII and Unicode characters represented by the current value.

Convert values

In the Calculator app on your Mac, enter the original value, choose Convert in the menu bar, then choose a category, such as Temperature or Currency.
Note: You must be connected to the internet to get the most recent currency conversion rate.

Round results

In the Calculator app on your Mac, choose View > Decimal Places, then choose the number of decimal places to display. Calculator stores the full value and displays the rounded value. If the displayed value shows fewer decimal places than you specified, the undisplayed decimal places are zeros.

Enter complex equations using Reverse Polish Notation (RPN)

In the Calculator app on your Mac, choose View > RPN Mode.
The stack is shown in Calculator’s display, the Equal Sign key (=) becomes the Enter key, and four keys appear for manipulating numbers on the stack.
Do any of the following:
- Swap the bottom two numbers on the stack: Click the Exchange Registers key .
- Move the most recently entered number up or down on the stack: Click the Roll Up key or Roll Down key .
- Remove the bottom number from the stack: Click the Drop key.

Correct unexpected results

In the Calculator app on your Mac, do any of the following:

Repeat the calculation, keeping in mind that Calculator uses the fundamental order of operations to evaluate expressions. For example, multiplication operations are completed before addition and subtraction.
If the programmer calculator displays numbers in an unexpected format, change to octal, decimal, or hexadecimal format: click the 8, 10, or 16 key, respectively, under the calculator’s display. Or use the basic or scientific calculator.
If the result contains no decimal points:
- Choose View > Basic or View > Scientific, because the programmer calculator truncates all digits after the decimal point. For example, if you enter 99 / 10 =, the result is 9. Use the basic or scientific calculator to get more precise results.
- Choose View > Decimal Places (in any cal

Calculator For Mac Widget