Physics

Resistor Noise Calculator

Find the thermal (Johnson) noise voltage of a resistor.

Calculated Output

Noise voltage (µV) 1.82

Formula: V_n = √(4·k·T·R·B)

Step-by-Step Breakdown

1. Values used:

2. Resistance = 10,000 Ω

3. Temperature = 300 K

4. Bandwidth = 20,000 Hz

6. Noise voltage = 1.82µV

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The math behind it

V_n = √(4·k·T·R·B), the Johnson–Nyquist noise over a bandwidth B.

10 kΩ at 300 K over 20 kHz → about 1.8 µV.

How to reduce it?

Lower the resistance, temperature or bandwidth.