# Calculation Edit Boxes

Numerical edit boxes generally support simple calculations.

A sum can be entered directly into the edit box:

Having typed an equation, pressing the = key will perform the entered calculation and fill the edit box with the answer.

## Special Calculation Characters

As well as the simple numerical calculations, such as **3+(4/5)**, several of Aspire's stored values can be accessed by using certain letters (which are not case-sensitive): When used, Aspire substitutes the character with the appropriate value in the calculation.

Character | Name | Example | Description |
---|---|---|---|

W or X | Material Width |
| Half of the material width |

H or Y | Material Height |
| Twice the height of the material |

T or Z | Material Thickness |
| 0.25 units less than the material thickness |

P | PI (3.141593) |
| Area of a 10 radius circle (π.r2) |

I | Imperial Conversion |
| Converts 25.4mm to inches |

M | Metric Conversion |
| Converts 2 inches to millimetres |

' | Feet |
| 34 inches (2 feet and 10 inches) |