Series and Parallel Resistance Calculator

Inputs and units

• Resistances in ohms: Enter your value in the format and unit shown.
• Connection: Choose Series, Parallel.

Calculation method

Series: add resistances. Parallel: reciprocal of the sum of reciprocals.

Worked example

The example values are: Resistances in ohms = 100,200,300; Connection = series

• Equivalent resistance (Ω): 600

Assumptions and limitations

Check that the inputs and units describe your situation.

Using your result

Select Calculate after changing inputs. Copy result copies the displayed output; Download result saves a text file. Reset returns the form to its example inputs. Calculations run in your browser.