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P3 International

P3 International Kill A Watt P4400 Electricity Usage Monitor

A plug-in meter for 120 V appliances that shows volts, amps, watts, VA, frequency, power factor and cumulative kWh for loads up to 15 A.

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P3 Kill A Watt P4400 plug-in electricity usage monitor, front view of the LCD, buttons and outlet
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Photo: P3 International

Key facts

Operating voltage
115 V AC
Maximum voltage
125 V AC
Maximum current
15 A
Maximum power
1875 VA
Accuracy
0.2% (as P3 states it)
Readings
True RMS volts and amps, watts, VA, frequency (Hz), power factor, cumulative kWh (0.01 to 9999 kWh) and elapsed hours
Memory
Totals reset when the meter is unplugged

Which version should you buy?

This page covers: P4400 Kill A Watt, single unit.

  • Standard Kill A Watt, single unit

    This page

    Model: P4400

    What differs
    Shows electrical readings and cumulative kWh; calculate costs yourself. Totals reset when unplugged.
    Best for
    Measuring appliance energy use and power readings.
    Check price on Amazon

  • Kill A Watt EZ

    Model: P4460

    What differs
    Adds on-screen operating costs, cost forecasts and battery-backed totals.
    Best for
    Seeing estimated running costs and keeping totals through a power interruption.

Watch out

  • P4400 and P4460 EZ look similar; EZ adds cost calculations and keeps totals through power loss.
  • Check the quantity: a two-pack contains more meters, not a different measurement model.

Why people pick it

  • Shows watts, kWh and power factor for anything on a 120 V plug
  • True RMS voltage and current, per the manual
  • P3 states 0.2% accuracy

Know before you buy

  • 120 V plug-in only: 240 V appliances need another tool
  • Rated 1875 VA, which equals watts only at a power factor of 1
  • Totals reset when it's unplugged
  • Shows kWh, not cost: the Kill A Watt EZ (P4460) adds cost projections

Full specifications

Operating voltage115 V AC
Maximum voltage125 V AC
Maximum current15 A
Maximum power1875 VA
Accuracy0.2% (as P3 states it)
ReadingsTrue RMS volts and amps, watts, VA, frequency (Hz), power factor, cumulative kWh (0.01 to 9999 kWh) and elapsed hours
MemoryTotals reset when the meter is unplugged
Size5 1/8 × 2 3/8 × 1 5/8 in
Weight5 oz

From manufacturer documentation, checked November 2, 2026. Spotted an error? Tell us.

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