Watts to Amps Calculator
Convert between watts and amps for DC, single-phase AC, and three-phase AC circuits
Electrical Power Calculator
Watts → Amps
Calculate current from power and voltage
Amps → Watts
Calculate power from current and voltage
DC Current
Direct current (batteries, solar panels)
Single-Phase AC
Household appliances, lighting
Three-Phase AC
Industrial motors, heavy equipment
Electrical power consumed or generated
Circuit voltage
Calculation Results
Formula: Enter values to see calculation
Example Calculations
Example 1: DC Circuit (LED Strip)
Power: 24W, Voltage: 12V DC
Calculation: I = P / V = 24W / 12V = 2A
Result: The LED strip draws 2 amperes of current
Example 2: Single-Phase AC (Home Appliance)
Power: 1800W, Voltage: 120V AC, PF: 0.9
Calculation: I = P / (V × PF) = 1800W / (120V × 0.9) = 16.67A
Result: The appliance draws 16.67 amperes from the outlet
Example 3: Three-Phase AC Motor (Industrial)
Power: 15000W, Voltage: 415V (Line-to-Line), PF: 0.85
Calculation: I = P / (√3 × V × PF) = 15000W / (1.732 × 415V × 0.85) = 24.6A
Result: The motor draws 24.6 amperes per phase
Common Electrical Values
Power Factor Reference
Quick Formulas
Understanding Watts, Amps, and Electrical Power
Basic Electrical Units
- •Watts (W): Unit of electrical power - energy per unit time
- •Amps (A): Unit of electrical current - charge flow rate
- •Volts (V): Unit of electrical potential difference
- •Power Factor: Ratio of real to apparent power in AC circuits
Current Types
DC (Direct Current)
Constant voltage and current direction. Used in batteries, electronics, solar panels.
AC (Alternating Current)
Voltage and current alternate direction. Used in power grids, household electricity.
Practical Applications
Circuit Design
- • Calculate wire size and breaker ratings
- • Determine power consumption costs
- • Size electrical components properly
- • Plan electrical load distribution
Safety Considerations
- • Prevent circuit overloading
- • Select appropriate fuses/breakers
- • Calculate heat dissipation
- • Ensure code compliance
Three-Phase Power Systems
Line-to-Line (Delta)
Voltage measured between any two phase conductors. Common in industrial applications where high power and efficiency are required. Formula includes √3 factor.
Line-to-Neutral (Wye/Star)
Voltage measured between any phase conductor and neutral. Common in commercial buildings. Provides both single-phase and three-phase power from same system.