Audio Power Calculator — Voltage, Impedance & Watts
Calculate power from voltage and impedance, or voltage from power and impedance.
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.