Reflectometer slide rules were handy for quickly looking up conversions between SWR, return loss, and reflection coefficient. Use this slide rule right on your computer (is this an anachronism?) in any JavaScript enabled web browser!

eCalc was formerly its own product/website but more recently has been incorporated into the EEWeb collection of engineering tools. It is a streamlined multi-function calculator, with unit conversion and several built-in scientific constants, that can be customized to suit the users preferences (including RPN operation!). The free online version runs without any special plug-ins required. Downloadable versions can be purchased for Windows and Mac OS (free trial available).

Software for Windows PC's with multiple calculators for PC board parameters.

The Saturn PCB Toolkit is the best resource for PCB related calculations you can find.
It incorporates many features that PCB designers and engineers are in regular need of like current capacity of a PCB trace, via current, differential pairs and much more. Please download our PCB Toolkit today for free and enjoy!