Two Parallel Resistors Calculator
Calculate equivalent resistance and branch currents for a parallel pair.
Your inputs
Calculation results
Formula & assumptions
Equivalent resistance = R₁R₂/(R₁+R₂); each branch has the supplied voltage.
Values use the specified units. Calculations use floating-point arithmetic. Check input measurements and formula assumptions before applying the result.
Compare your scenarios
Save up to five results to compare changes side by side. Scenarios stay in this tab until you clear or reload it.
Using Two Parallel Resistors Calculator
Calculate equivalent resistance and branch currents for a parallel pair.
- Enter first resistor, second resistor, applied voltage using the units printed under each field.
- Choose Calculate, or enable live updates. Review the result labels and formula assumptions.
- Save scenarios to compare up to five variations, then copy the report or download JSON or CSV.
Example
First resistor: 1000 ohms Second resistor: 2000 ohms Applied voltage: 12 volts Equivalent resistance · ohms: 666.66667 First branch current · milliamps: 12 Second branch current · milliamps: 6 Combined current · milliamps: 18
Questions & answers
What does Two Parallel Resistors Calculator calculate?
Calculate equivalent resistance and branch currents for a parallel pair.
Which units should I enter?
First resistor uses ohms. Second resistor uses ohms. Applied voltage uses volts. Convert values to these units before calculating.
Which formula does it use?
Equivalent resistance = R₁R₂/(R₁+R₂); each branch has the supplied voltage.
What does the included example show?
First resistor: 1000 ohms; Second resistor: 2000 ohms; Applied voltage: 12 volts. Result: Equivalent resistance · ohms = 666.66667; First branch current · milliamps = 12; Second branch current · milliamps = 6; Combined current · milliamps = 18.
Can I compare different settings?
Yes. Save a scenario, change the inputs and save another result. Up to five scenarios are compared in this tab; they disappear when you reload or leave.
Can I export the calculation?
Copy the JSON report or download JSON and CSV with inputs, result labels and numeric values. Processing uses local JavaScript; no calculation request is sent to our server. Displayed values use up to 10 significant digits; exports retain JavaScript numeric precision.
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