The first two calculators below calculate series or parallel
combinations of resistors. Enter the resistor value and press 'Add to Total'. Repeat until
all resistors have been entered. Press 'Clear Total' to start a new calculation.
The third calculator will find a resistor value to place in parallel with a
given resistor value to produce a specified total. Preferred resistor values are
also calculated, use the radio buttons on each calculator to select the preferred value series to use.
Resistors in Series - Calculate Total:
Resistors in Parallel - Calculate Total:
2 Resistors in Parallel - Calculate One Resistor from Other and Total:
Resistors in series:
Resistors in parallel:
1 / RTOTAL
= (1 / R1
) + (1 / R2
) + (1 / R3
) + ...
See the technical data section
for more details.
If you found this calulator useful you should try Electronics Assistant!
- All the online calculators and more in a stand-alone application
- Converts Resistor & Inductor colour codes, calculates LED series resistors, capacitance
units, series / parallel resistors & capacitors, frequency, reactance & more
- Calculation of nearest preferred resistor values with a choice of 5 series from E12 to E192
- Print & save calculation results