47 Ω and 100 Ω Resistors in Parallel
A 47 Ω and a 100 Ω resistor in parallel give approximately 31.97 Ω — a common calculation when using E24 series components.
How to use this tool
- Enter resistor r₁, resistor r₂, resistor r₃ (optional) and resistor r₄ (optional) in the fields above.
- Results update instantly as you type — or click Calculate.
- Read your parallel resistance and the full breakdown beneath it.
47 Ω and 100 Ω are both standard E24 series values; their parallel combination of ~32 Ω is useful in audio and signal circuits.
Frequently asked questions
- Why is parallel resistance always less than any individual resistor?
- Adding a parallel path gives current more routes to flow, increasing total conductance (1/R). Higher conductance = lower resistance.
- What is the formula for exactly two resistors in parallel?
- R = R₁ × R₂ / (R₁ + R₂). Quick shortcut: two equal 10 Ω resistors in parallel give 5 Ω.