Headphone Power Calculator

Find the power needed to drive headphones.

Power required (mW) 0.0316

Voltage required (Vrms) 0.0318

Formula: mW = 10^((target − sensitivity)÷10); V = √(mW×impedance÷1000)

Step-by-step with your numbers:

1. Values used:

2. Impedance = 32 Ω

3. Sensitivity = 100 dB/mW

4. Target volume SPL = 85 dB

6. Power required = 0.0316mW

7. Voltage required = 0.0318Vrms

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Find amp power and voltage to drive headphones to a target loudness.

The math behind it

mW = 10^((target SPL − sensitivity)/10); voltage = √(mW × impedance ÷ 1000).

32 Ω, 100 dB/mW, 85 dB target → ~0.03 mW (very little).

High impedance headphones?

300-ohm cans need more voltage but less current.