For extremely easy unit conversions and other electronics mathematics try the WolframAlpha website.

- Want to see an oddball value like 100nF expressed in more common units? Type “100pF” into WolframAlpha and see it expressed in different units.
- Want to know the frequency of 4.5ns? Type “4.5ns” into WolframAlpha and see the frequency and much more.
- Or do the reverse, want to know the period of 100MHz? Type “100MHz” into WolframAlpha for the period and much more.
- Want a resistor color code? Type “20 ohm” and get the resistor color code.

All these calculations are pretty easy to do but it is nice if you are having a late night and just want to double check your calculations.