There's an endless supply of Web-based tools that can convert just about any measurement from one unit to another. If you need to convert really obscure units, though, or need a conversion tool on a regular basis, try Unit Conversion Professional from Inventive Design. It's a free Flash-based tool that converts more than 800 pairs of units in 32 categories. It also includes a calculator and a library of scientific formulas.
Unit Conversion Professional's dialog-style interface opens with its menu page, which offers two scrolling lists, View Formulas and Convert Units. The conversion units are categorized from Acceleration to Volume. Clicking on a category called up applicable conversion tools; clicking Menu took us back to the menu page. We could also select Browse A-Z, which brought up a list ranging from Abampere-Current to Zip 250-Data Storage; an impressive range. Conversions are ultrasimple: just enter the values and units and the tool does the rest. In this way we learned that 13 acres equals 5.33 darcy (approximately). The View Formulas list worked in similar fashion; for instance, clicking Mechanics called up a list of variables and equations for velocity, acceleration, angle, and more. We could print any view or expand or contract the view from the interface by clicking plus and minus icons. The Calculator tool has an interesting angled 3D perspective and a realistic rendition. It's a basic calculator, not a scientific tool. This program has no Help file other than an About file for Adobe Flash Player, but it needs none.
The only drawback to Unit Conversion Professional, and it's a stretch to call it that, is a bar of links to the developer's other software. If you're looking for an easy-to-use conversion tool that offers just about every unit you can think of and then some, plus handy formulas, look no further.
From Inventive Design:
Unit Converter Professional is a tool that converts more than 800 pairs of units within 32 different categories. This tool provides convenience for students, scientists, chemists, and engineers. The application also includes a practical calculator and a useful library of common formulas and equations used in mathematics and physics. Version 1.4 adds a useful browse function, allowing users to quickly search through 100s of units and categories.
What's new in this version:
User interface has been enhanced to improve workflow.
A new browse function is added to quickly search through 100s of units.
If you are converting acceleration, angle, angular velocity, area, capacitance, charge, current, density, distance, flow, force, illumination, flux, mass, power, pressure (except one), radiation, sound, temperature, time, torque, velocity/speed, viscosity, volume this is your software. If you want to see symbols, constants, or many other formulas - this is a nice program.
Great software BUT... in HVAC work in the U.S., many engineering firms and building management systems still work in inches of water column for pressure, and this doesn't have that measure.
Let's list the units converted in a units conversion program, shall we?