ResistorCalc is a calculator based on the color band system that is used to identify the specifications of resistors, it is a very simple Java program that allows the calculation of resistors with 3, 4, 5, 6 color bands.
The program is set by default to 4 color bands since this category of resistors are the most widespread today.
| Color | 1 band | 2 band | 3 band | Multiplier | Tolerance |
| Black | 0 | 0 | 0 | 1ohm | |
| Brown | 1 | 1 | 1 | 10ohm | 1% |
| Red | 2 | 2 | 2 | 100ohm | 2% |
| Orange | 3 | 3 | 3 | 1k ohm | |
| Yellow | 4 | 4 | 4 | 10k ohm | |
| Green | 5 | 5 | 5 | 100k ohm | 0.5% |
| Blue | 6 | 6 | 6 | 1M ohm | 0.25% |
| Violet | 7 | 7 | 7 | 10M ohm | 0.1% |
| Grey | 8 | 8 | 8 | 0.05% | |
| White | 9 | 9 | 9 | ||
| Gold | 5% | ||||
| Silver | 10% |
Warning: If there are 5 or 6 bands, the value bands will be 3 plus one for multiplication, while in the case of 3 or 4 band resistors, those used for the value will be 2 plus one for multiplication.
It is possible to export the values obtained in a CSV file, even in cumulative mode, so as to be able to map an entire circuit without having the slightest hassle.