### Get Started Calculating in Calculator

Dicom Calculator is to quickly evaluate mathematical expressions. You can
enter and edit expression using computer keyboard or Dicom *Calculator
Keyboard*. Result of the expression can be copied and used elsewhere. The
result is also stored in memory for further manipulation if necessary.

#### Open Calculator

If Calculator is not already open, from the menu select **View / Calculator **to
open it. Depending on the startup mode, Calculator size, position and docking
condition may vary.

#### Write Expression

Write your expression in the *Expression Area*. *Expression Area* is the topmost
editable zone on the calculator. You may use computer keyboard or click on mouse
buttons on the *Calculator Keyboard* to key-in.

To add 1 and 2 you need to write: * 1+2* in the expression area.
You can also write
dimensional expression in calculator. For example, *
3 ft. + 2 m. to m. *will evaluate to * 2.9144 m.*

The "+" symbol is an operator, used to add two numbers or units. Following
are some Dicom operators to perform common calculation.

Table: Common Dicom Operators

**Operator** |
**Operation** |

+ |
Addition |

- |
Substraction |

* |
Multiplication |

/ |
Division |

^ |
Exponentiation |

** |
Exponentiation |

**Tips:** You can use right mouse button to click on the *Calculator
Keyboard *to avoid pressing **Shift** key.

#### Evaluate Expression

You can evaluate expression in the following way:

- Press [
**Enter**] key on the computer keyboard, or
- Press
**Enter** or **Ent** key on the *Calculator Keyboard*, or
- Click on the Result area of the Calculator, right click to display the
context menu. Select
**Calculate**, or
- From the Dicom main menu select
**Calculator / Calculate**.

Calculator displays the result of an expression in the *Result Area.*

#### Clear Expression

To clear an expression and its result do any one of the following:

- Press Clear on the
*Calculator Keyboard*, or
- Click on the Result area of the Calculator, right click to display the
context menu. Select
**Clear Calculation**, or
- From the Dicom main menu select
**Calculator / Clear Calculation**, or
- If Dicom main window is active, you can also press [
**Ctrl+L**] to
clear

**See also:** For a complete list of operators see
Dicom Operators. To know how to write Dicom expressions see
Rules of Writing Expression. To know more advanced
features of Calculator see Working with
Calculator.