To get non-standard resistor value we can use parallel or series resistor combination. You can do quick calculation for R series but, sometimes, it’s hard to get good resistance combination in parallel resistor to get R value that we need. Thanks to Claudio Girardi who has built Resistor Series-Parallel Calculator. It will help you find best resistor combination / match with easy. Just fill the resistor value that you need then the software will calculate the best resistor combination for the E12 (10%), E24 (5%) and E96 (1%) series.