Volts to Watts Calculator

Convert between volts to watts and watts to amps for DC, single-phase AC, and three-phase AC systems with accurate voltage, current, and power factor calculations.

Electrical Safety:

This calculator provides mathematical conversions for informational purposes only. Electrical work should only be performed by qualified professionals. Not a substitute for professional electrical advice.

Volts to Watts Calculator

Power Results

Enter values and select system type to calculate

Volts to Watts Calculator

Electrical calculations can be tricky because power, voltage, and current are interconnected in complex ways. Many people mistakenly think they can convert volts to watts directly, but the relationship depends on the electrical system type and requires current measurements. This calculator handles both directions of conversion to help you understand electrical power relationships.

Core Electrical Formulas

Different electrical systems use different formulas because they handle power differently:

DC Power: P = V × I
DC Current: I = P ÷ V
AC Single Phase Power: P = V × I × PF
AC Single Phase Current: I = P ÷ (V × PF)
AC Three Phase Power: P = √3 × V × I × PF
AC Three Phase Current: I = P ÷ (√3 × V × PF)

Power factor is crucial in AC systems because it accounts for the phase difference between voltage and current. Three-phase systems distribute power across three conductors with 120-degree phase offsets.

Practical Conversion Examples

System Type Voltage Current Power Factor Power
DC 12 V 2 A — 24 W
DC 24 V 1.25 A — 30 W
DC 48 V 0.63 A — 30 W
DC 120 V 8.33 A — 1000 W
DC 220 V 4.55 A — 1000 W
DC 12 V 0.1 A — 1.2 W
DC 5 V 0.5 A — 2.5 W
DC 3.7 V 1 A — 3.7 W
DC 9 V 0.33 A — 3 W
DC 36 V 0.83 A — 30 W
Single-phase AC 120 V 8.33 A 1.0 1000 W
Single-phase AC 230 V 4.35 A 0.9 1000 W
Single-phase AC 240 V 4.17 A 1.0 1000 W
Single-phase AC 110 V 9.09 A 1.0 1000 W
Single-phase AC 220 V 4.55 A 1.0 1000 W
Single-phase AC 120 V 7.5 A 0.8 900 W
Single-phase AC 230 V 3.91 A 0.85 900 W
Single-phase AC 240 V 3.75 A 0.8 900 W
Single-phase AC 120 V 16.67 A 1.0 2000 W
Single-phase AC 230 V 8.7 A 1.0 2000 W
Single-phase AC 240 V 8.33 A 1.0 2000 W
Single-phase AC 120 V 6.25 A 0.8 750 W
Single-phase AC 230 V 3.26 A 0.85 750 W
Single-phase AC 240 V 3.13 A 0.8 750 W
Single-phase AC 120 V 25 A 1.0 3000 W
Single-phase AC 230 V 13.04 A 1.0 3000 W
Single-phase AC 240 V 12.5 A 1.0 3000 W
Three-phase AC 208 V 3.35 A 0.85 1200 W
Three-phase AC 400 V 2.89 A 0.8 2000 W
Three-phase AC 415 V 2.77 A 0.85 2000 W
Three-phase AC 480 V 1.44 A 0.9 1000 W
Three-phase AC 220 V 6.31 A 0.85 2400 W
Three-phase AC 380 V 3.68 A 0.9 2400 W
Three-phase AC 440 V 3.13 A 0.88 2400 W
Three-phase AC 208 V 8.03 A 0.85 2880 W
Three-phase AC 400 V 4.33 A 0.85 3000 W
Three-phase AC 415 V 4.17 A 0.88 3000 W
Three-phase AC 480 V 3.6 A 0.9 3000 W
Three-phase AC 600 V 2.89 A 0.9 3000 W
Three-phase AC 690 V 2.5 A 0.88 3000 W
Three-phase AC 208 V 4.81 A 0.8 1720 W
Three-phase AC 400 V 2.48 A 0.85 1720 W
Three-phase AC 415 V 2.38 A 0.88 1720 W
Three-phase AC 480 V 2.06 A 0.9 1720 W
DC 6 V 0.5 A — 3 W
DC 18 V 0.17 A — 3 W
DC 60 V 16.67 A — 1000 W
DC 72 V 13.89 A — 1000 W
DC 96 V 10.42 A — 1000 W
DC 150 V 6.67 A — 1000 W
DC 300 V 3.33 A — 1000 W
DC 450 V 2.22 A — 1000 W
DC 600 V 1.67 A — 1000 W
DC 1.5 V 0.002 A — 0.003 W
Single-phase AC 100 V 10 A 1.0 1000 W
Single-phase AC 200 V 5 A 1.0 1000 W
Single-phase AC 277 V 3.61 A 1.0 1000 W
Single-phase AC 347 V 2.88 A 1.0 1000 W
Single-phase AC 480 V 2.08 A 1.0 1000 W
Single-phase AC 600 V 1.67 A 1.0 1000 W
Three-phase AC 575 V 1.51 A 0.9 1500 W
Three-phase AC 660 V 1.31 A 0.88 1500 W
Three-phase AC 720 V 1.2 A 0.9 1500 W
Three-phase AC 230 V 3.75 A 0.85 750 W
Three-phase AC 460 V 0.94 A 0.9 750 W

When to Use Each Calculation Direction

Volts to Watts: Use when you know the voltage and current flowing through a circuit. Perfect for measuring actual power consumption of devices or calculating load requirements.

Watts to Amps: Use when you know the power rating and voltage. Essential for determining wire sizes, circuit breaker ratings, and electrical safety calculations.

Both calculations are fundamental for electrical engineers, electricians, and anyone working with electrical systems. Understanding these relationships helps ensure safe and efficient electrical installations.

Remember, while this calculator provides accurate mathematical results, electrical work involves safety considerations that go beyond calculations. Always consult licensed electricians for installation and modification work, and verify local electrical codes before making changes to any electrical system.