---
name: "unitconv"
section: "1"
platform: "linux"
package: "xcrysden"
version: "1.6.2-4"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/unitconv"
---

# unitconv(1)

simple energy and length units converter

## NAME

unitconv - simple energy and length units converter

## SYNOPSIS

**unitconv** \[*unit*\] *value*\
 **unitconv** \[*unit*\] *expression*

## DESCRIPTION

**unitconv** is a simple energy and length units converter (written in Tcl). It is a utility program of **xcrysden** package (*http://www.xcrysden.org/*).

## ENERGY UNITS

The following **energy units** are supported.  The following list contain the "*unit* -- description" pairs, where the *unit* is to be specified on the command line.

- **au** -- Hartree

  - **ry** -- Rydberg

  - **ev** -- eV (electron volt)

  - **kjm** -- kJ/mol

  - **kj** -- kJ

  - **kcalm** -- kcal/mol

  - **kcal** -- kcal

  ## LENGTH UNITS

The following **length units** are supported (usage as above):

- **angs** -- Angstrom

  - **bohr** -- Bohr radius

  - **m** -- meter

  ## EXAMPLES

Convert a value from eV to other energy units:

**unitconv ev 3.25**

Calculate an expression (values in Rydberg unit) and convert to other energy units (note that expression must be quoted):

**unitconv ry "-103.134567 - (-240.691356 - -2\*17.543471)/2"**

In expression also mathematical functions available in **tclsh** can be used.

## COPYRIGHT

Copyright (C) 1996--2012 Anton Kokalj

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.  You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more details.