This parallel resistor reference table shows the combined resistance for a range of resistor r1 values, assuming a resistor r2 of 200 Ω. Every figure is computed with the same engine that powers our Parallel Resistor Calculator, so the numbers are exact.
| Resistor R1 | Combined resistance |
|---|---|
| 25 Ω | 22.222 |
| 50 Ω | 40.000 |
| 75 Ω | 54.545 |
| 100 Ω | 66.667 |
| 150 Ω | 85.714 |
| 200 Ω | 100.000 |
| 300 Ω | 120.000 |
| 500 Ω | 142.857 |
| 700 Ω | 155.556 |
| 1,000 Ω | 166.667 |
How to use this table
Find the row closest to your resistor r1 and read across to the combined resistance. For a value between two rows, the real figure sits between them — or enter your exact numbers in the Parallel Resistor Calculator for a precise answer.
Need a value that is not in the table? — the Parallel Resistor Calculator does it instantly, for free, with the formula and a worked example built in.
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