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Electrical Power & Current Calculator

Convert Watts into Amperes

Convert Watts to Amps (W to A) or Amps to Watts (A to W) instantly. Supports DC, AC Single-Phase, and AC 3-Phase systems with customizable voltage, power factor, breaker sizing, and electricity cost estimation.

✓ DC Direct Current✓ AC 1-Phase (120V/230V)✓ AC 3-Phase (208V/400V/480V)✓ Breaker & Wire Sizing
Electric Conversion Matrix
Choose conversion direction and circuit parameters below.
120 Volts
V

Standard single-phase alternating current for home appliances.

1.00

Resistive loads = 1.0 • Electronics = 0.95 • Motors/Compressors = 0.80

0.10 (Highly Inductive)0.500.80 (Standard Motors)1.00 (Pure Resistive)
Calculated Result
12.5 AAmperes
Current (Amps)12.5 A12,500 mA
Real Power (Watts)1,500 W1.5 kW
Apparent Power (VA)1,500 VA1.5 kVA
Circuit Resistance9.6 ΩOhmic impedance
Circuit Breaker Sizing (NEC 80% Rule)
20 Amp Breaker

Continuous load rated at 16A (80% safe continuous operating limit for circuits).

Recommended Copper Wire Gauge
12 AWG (up to 20A)

Metric conductor equivalent: 2.5 mm² copper wire under standard insulation ratings.

Applied Formula:

I = 1,500 W / (120 V × 1) = 12.5 A

Operating Electricity Cost Estimator

Estimate running costs for this electrical load (1.5 kW) based on daily usage.

Estimated Monthly Cost$27.37~182.4 kWh / mo
Estimated Annual Cost$328.72per 365.25 days

Standard World Voltage Presets

Click to load voltage & system
Common Appliance Wattage & Amperage Directory
Click any standard household appliance to automatically load its power specifications.
Electronics120V

Smartphone Fast Charger

USB-C PD fast charger

30 W~0.3 A
Lighting120V

LED Smart Light Bulb

60W incandescent equivalent

10 W~0.1 A
Electronics120V

Laptop Computer Charger

Standard 65W-100W laptop adapter

85 W~0.7 A
Electronics120V

55" 4K OLED Smart TV

Living room entertainment center

120 W~1.1 A
Electronics120V

Desktop Gaming PC Setup

Tower + dual monitor active gaming

550 W~4.7 A
Kitchen120V

Kitchen Microwave Oven

1000W cooking output microwave

1200 W~11.1 A
Kitchen120V

Electric Coffee Maker

Standard drip coffee brewer

1000 W~8.3 A
Kitchen120V

Electric Toaster (2-Slice)

Pure resistive heating element

900 W~7.5 A
Heating120V

Portable Electric Space Heater

High setting residential space heater

1500 W~12.5 A
Bathroom120V

Hair Dryer / Blow Dryer

Maximum residential 15A outlet load

1800 W~15.3 A
Kitchen120V

Household Refrigerator / Freezer

Compressor cycle average power

200 W~2.2 A
Cooling240V

Central Air Conditioner (3-Ton)

240V dedicated circuit AC condenser

3500 W~17.2 A
EV & Automotive240V

Level 2 EV Home Charger

32-Amp 240V electric vehicle charging

7680 W~32 A
Automotive12V

12V Car Refrigerator / Cooler

12V DC vehicle accessory socket

45 W~3.8 A

Watts to Amps Reference Charts

Instant quick lookup charts for 120V AC (US standard), 230V AC (EU/UK standard), and 12V DC systems.

120V AC (US / Canada)PF = 1.0
Watts (W)Amps (A)BreakerWire
100 W0.83 A15 A14 AWG
250 W2.08 A15 A14 AWG
500 W4.17 A15 A14 AWG
750 W6.25 A15 A14 AWG
1,000 W (1 kW)8.33 A15 A14 AWG
1,200 W10.00 A15 A14 AWG
1,500 W12.50 A20 A12 AWG
1,800 W (Max 15A)15.00 A20 A12 AWG
2,000 W (2 kW)16.67 A20 A / 25 A12 AWG / 10 AWG
2,400 W (Max 20A)20.00 A30 A10 AWG
3,000 W (3 kW)25.00 A30 A10 AWG
3,600 W30.00 A40 A8 AWG
230V AC (UK / EU / AU)PF = 1.0
Watts (W)Amps (A)BreakerCable
100 W0.43 A10 A / 16 A1.5 mm²
500 W2.17 A10 A / 16 A1.5 mm²
1,000 W (1 kW)4.35 A10 A / 16 A1.5 mm²
1,500 W6.52 A10 A / 16 A1.5 mm²
2,000 W (2 kW)8.70 A16 A1.5 mm²
2,300 W (Max 10A)10.00 A16 A1.5 mm²
2,500 W10.87 A16 A2.5 mm²
3,000 W (3 kW)13.04 A16 A2.5 mm²
3,680 W (Max 16A)16.00 A20 A2.5 mm²
5,000 W (5 kW)21.74 A25 A / 32 A4.0 mm²
7,000 W (7 kW)30.43 A32 A / 40 A6.0 mm²
10,000 W (10 kW)43.48 A50 A / 63 A10.0 mm²
12V DC (Automotive / Solar)Direct Current
Watts (W)Amps (A)Rec. Fuse
10 W0.83 A2 A
25 W2.08 A5 A
50 W4.17 A7.5 A
100 W8.33 A10 A / 15 A
150 W12.50 A15 A / 20 A
200 W16.67 A25 A
300 W25.00 A30 A / 40 A
500 W41.67 A50 A / 60 A
1,000 W (1 kW)83.33 A100 A / 125 A
1,500 W125.00 A150 A / 175 A
2,000 W166.67 A200 A / 250 A
3,000 W250.00 A300 A / 350 A

How to Calculate Watts and Amps: Formulas & Theory

Understanding Watt’s Law, Ohm’s Law, power factor, and single vs. three-phase calculations.

1. DC (Direct Current) Formulas

In a direct current (DC) circuit, electrical power is simply the product of voltage and current without phase displacement.

Current (Amps): I = P / V
Power (Watts): P = V × I
Voltage (Volts): V = P / I
Resistance (Ohms): R = V / I = V² / P

Example: A 60-Watt 12V car spotlight draws I = 60W / 12V = 5.0 Amperes.

2. AC Single-Phase Formulas

In alternating current (AC) single-phase circuits, inductive or capacitive loads cause a phase shift between current and voltage represented by the Power Factor (PF).

Current (Amps): I = P / (V × PF)
Real Power (Watts): P = V × I × PF
Apparent Power (VA): S = V × I

Example: A 1,500W space heater with PF=1.0 on a 120V outlet draws I = 1500 / (120 × 1.0) = 12.5 Amps.

3. AC 3-Phase Line-to-Line Formulas

For three-phase AC systems measured between two hot phase conductors (Line-to-Line voltage VL-L), the square root of 3 (√3 ≈ 1.73205) is included in the denominator.

Current (Amps): I = P / (√3 × V_LL × PF)
Real Power (Watts): P = √3 × V_LL × I × PF

Example: A 10 kW (10,000W) motor at 480V 3-phase with PF=0.85 draws I = 10,000 / (1.732 × 480 × 0.85) = 14.16 Amps.

4. The 80% Rule & Wire Sizing

Under the National Electrical Code (NEC), continuous loads (running for 3 hours or more) must not exceed 80% of the circuit breaker rating.

• 15 Amp Circuit: Maximum 12 Amps continuous (1,440 Watts @ 120V)
• 20 Amp Circuit: Maximum 16 Amps continuous (1,920 Watts @ 120V)
• 30 Amp Circuit: Maximum 24 Amps continuous (5,760 Watts @ 240V)
• 50 Amp Circuit: Maximum 40 Amps continuous (9,600 Watts @ 240V)

Frequently Asked Questions (FAQ)

Common questions about converting watts to amps and electrical circuit safety.

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