RMS to Watts Converter

Your details

Select the values you already have. The calculator computes real power (watts) and fills in the related quantities.
Root mean square voltage - the AC equivalent of a DC voltage that produces the same heating effect.
V
The impedance or DC resistance of the load (e.g. speaker voice coil or resistor).
Ω
Real power
1,800W

True (RMS) power dissipated in the load

Peak power3,600W
RMS voltage120V
Peak voltage169.706V
RMS current15A
RMS power (W)1,800
Peak power (W)3,600

Real power: 1800.00 W | Peak power: 3600.00 W

  • RMS voltage is 120.00 V, equivalent to the DC voltage that would produce the same heating. The peak is 169.71 V, which is 1.4142 times higher.
  • The effective current through the load is 15.000 A RMS.
  • Real (RMS) power is 1800.00 W - this is what your equipment continuously handles and what determines heat dissipation.
  • Peak power is 3600.00 W - twice the RMS value for a pure sine wave. Speaker and amplifier ratings usually quote RMS, not peak, so always compare like with like.
  • For high-power systems, ensure your amplifier RMS rating meets or exceeds the speaker's continuous RMS rating to avoid clipping.

Next stepMatch your amplifier's RMS output rating to your speaker's RMS power handling. A 10-20% headroom above the speaker's rated RMS prevents clipping without risking the driver.

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