# Command Reference

## Menu Items

A brief overview of some special menu items in &kcalc;:

Constants Mathematics

- Display Pi, Euler Number or Golden Ratio.

Constants Electromagnetism

- Display Light Speed, Elementary Charge, Impedance of Vacuum, Permeability of Vacuum or Permittivity of Vacuum.

Constants Atomic & Nuclear

- Display Planck's Constant, Elementary Charge or Fine-Structure Constant.

Constants Thermodynamics

- Display Boltzmann Constant, Atomic Mass Unit, Molar Gas Constant, Stefan-Boltzmann Constant or Avogadro's Number.

Constants Gravitation

- Display Constant of Gravitation or Earth Acceleration.

Settings Simple Mode

- Displays the simple math buttons.

Settings Science Mode

- Displays trigonometric and science buttons.

Settings Statistic Mode

- Displays statistic buttons.

Settings Numeral System Mode

- Displays logic buttons and allows changing the numeral system.

Settings Constants Buttons

- Display constants buttons. They are available in science mode and statistic mode.

Settings Show Bit Edit

- Displays a bit edit field. Click on a bit to toggle it. Only available in numeral system mode.

Additionally &kcalc; has the common File, Edit, Settings and Help menu items, for more information read the sections about the Menus in the &kde; Fundamentals.