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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:

Select preferred series (optional):

E12 E24 E48 E96 E192

Total R =
?
Preferred Total R =
?

Resistors in Parallel - Calculate Total:

Select preferred series (optional):

E12 E24 E48 E96 E192

Total R =
?
Preferred Total R =
?

2 Resistors in Parallel - Calculate One Resistor from Other and Total:

Enter R1 and the total resistance to calculate the value of the other resistor needed to produce the required total.


E12 E24 E48 E96 E192 		R2 = ?
Preferred Total R = ?

Formulae

Resistors in series:

RTOTAL = R1 + R2 + R3 + ...

Resistors in parallel:

1 / RTOTAL = (1 / R1) + (1 / R2) + (1 / R3) + ...

See the technical data section for more details.

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