Audio Power Calculator — Voltage, Impedance & Watts
Calculate power from voltage and impedance, or voltage from power and impedance.
Enter the calculation mode
Enter the voltage (rms)
Electrical impedance in ohms
How We Calculate This
Power from voltage and impedance
P = V² / R
Voltage from power and impedance
V = √(P × R)
dBW and dBm
dBW = 10 × log10(P) where P is in watts
dBm = 10 × log10(P × 1000) where P is in watts
Frequently Asked Questions
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Last updated: February 2026
All calculations are estimates based on standard formulas. Always verify results for critical applications.