These calculators are used for helping you figure out what values of what you need for the Current Transformer(s) used in the Open Energy Monitor.
Calculators work as follows:
The first one calculates what value burden resistor you need for a Current Transformer with known turn ratio and the desired maximum current readable.
The second one calculates the maximum current readable given a known burden resistor value and current transformer turn ratio.
The last one calculates the number of turns required in a current transformer to meet the specified burden resistor and maximum current values.