Step-by-step instructions
- Enter or select R1 (Ω).
- Enter or select R2 (Ω).
- Enter or select R3 (Ω).
- Tap Calculate.
- Review the result shown directly below the calculator.
Parallel Resistance Calculator
Calculate equivalent resistance for three parallel resistors.
How to use the Parallel Resistance Calculator
Calculate equivalent resistance for three parallel resistors.
What the inputs mean
- R1 (Ω)
- Enter the value requested by this field label.
- R2 (Ω)
- Enter the value requested by this field label.
- R3 (Ω)
- Enter the value requested by this field label.
Formula or calculation method
The calculator applies the standard mathematical relationship for the labeled inputs and returns the computed result automatically.
Example
Try entering realistic values for R1 (Ω) and R2 (Ω), then tap Calculate to see how the result changes.
How to understand the result
Use the result as an estimate based on the values you entered. For planning decisions, double-check that the input units and assumptions match your real situation.
Tip: Keep all values in compatible units and use values from the same time period when the calculator compares two amounts.