Not so with **UnitCalc**. It's a Reverse Polish Notation
calculator which does all arithmetic with the numbers *and* the
units. Many mistakes will be caught immediately when the units in your
answer are not what you expect; other mistakes will be avoided entirely,
since you never need to shift decimal places (for example, when dividing
m^2 by mm*cm). Moreover, UnitCalc is fully configurable -- you define
what units you like to use. It will even do American units, if that's
what you prefer.

You Enter: | UnitCalc Displays: | What's Going On? |
---|---|---|

300 g | 0.3 kg | per our preferences, show mass in kilograms |

5 m^2 | 5 m^2 0.3 kg |
puts 5 square meters on the stack |

* | 1.5 m^2 kg | multiplies top 2 elements of stack, with units |

clear | empties the stack | |

j | 1 j | puts 1 joule on the stack |

w | 1 w 1 j |
puts 1 watt on the stack |

off | 1000 m^2 sec^-3 g 1000 m^2 sec^-2 g |
turns off unit conversion; shows values in base units |

/ | 1 sec | divides (1 j / 1 w), leaving 1 sec on stack |

10 v | 10000 m^2 sec^-2 g c^-1 | puts 10 volts on the stack in base units |

on | 10 v | resume showing in preferred units |

2 ohm | 2 ohm 10 v |
puts 2 ohm on the stack |

/ | 5 amp | divide (an application of Ohm's Law) |

http://www.strout.net/macsoft/unitcalc/index.html

Last Updated: 3/30/98 . . . . . . webmaster@strout.net