Calculate amps from kilowatts in seconds. Enter power (kW), voltage, phase type, and power factor for accurate single-phase or three-phase results. Trusted by electricians, engineers, and DIYers worldwide.
kW to Amps Converter
Current (A): —
kW to Amps Formulas
Single-Phase AC
Formula: Amps = (kW × 1,000) ÷ (Voltage × Power Factor)
Example:
5 kW @ 230V, Power Factor 0.8
Amps = (5 × 1,000) ÷ (230 × 0.8) = 27.17 A
Three-Phase AC (Line-to-Line)
Formula: Amps = (kW × 1,000) ÷ (√3 × Voltage × Power Factor)
Note: √3 = 1.732
Example:
15 kW @ 400V, Power Factor 0.9
Amps = (15 × 1,000) ÷ (1.732 × 400 × 0.9) = 24.03 A
DC Systems
Formula: Amps = (kW × 1,000) ÷ Voltage
Example:
3 kW @ 48V
Amps = (3 × 1,000) ÷ 48 = 62.5 A
kW to Amps Reference Chart (Common Voltages)
Based on power factor 0.8. Adjust calculator for your exact power factor.
Single-Phase 230V (Common in UK/EU Homes)
| kW | Amps (230V, PF 0.8) | Typical Use Case |
|---|---|---|
| 1 kW | 5.43 A | Small appliance circuit |
| 1.5 kW | 8.13 A | Microwave, coffee maker |
| 3 kW | 16.30 A | Electric kettle, space heater |
| 3.5 kW | 19.04 A | Large air conditioner |
| 4.5 kW | 24.49 A | Electric dryer (single-phase) |
| 5 kW | 27.17 A | EV charger (Level 1) |
| 7.5 kW | 40.76 A | Small workshop setup |
| 10 kW | 54.35 A | Home workshop or small business |
| 11 kW | 59.78 A | Large EV charger |
| 15 kW | 81.52 A | Small commercial load |
| 20 kW | 108.70 A | Light commercial equipment |
| 50 kW | 271.74 A | Generator output (single-phase) |
| 100 kW | 543.48 A | Industrial backup power |
Three-Phase 400V (Common in UK/EU Commercial)
| kW | Amps (400V, PF 0.8) | Typical Use Case |
|---|---|---|
| 1 kW | 1.81 A | Small control circuit |
| 3 kW | 5.44 A | Small industrial motor |
| 5 kW | 8.77 A | Industrial motor (small) |
| 7.5 kW | 13.16 A | Commercial pump or fan |
| 10 kW | 17.54 A | Medium HVAC unit |
| 15 kW | 26.31 A | Commercial HVAC or compressor |
| 20 kW | 35.07 A | Industrial machinery |
| 50 kW | 87.68 A | Generator output rating |
| 100 kW | 175.36 A | Data center backup or factory line |
Three-Phase 480V (Common in US Industrial)
| kW | Amps (480V, PF 0.8) | Typical Use Case |
|---|---|---|
| 5 kW | 7.53 A | Small industrial motor |
| 10 kW | 15.06 A | Commercial HVAC |
| 15 kW | 22.59 A | Large compressor |
| 25 kW | 37.65 A | Industrial production line |
| 50 kW | 75.30 A | Medium generator output |
| 100 kW | 150.60 A | Large industrial equipment |
How to Convert kW to Amps: Professional Guide
Step 1: Identify Your System Type
- Single-Phase AC: Common in residential settings (120V in North America, 230V in UK/EU/Australia). Use for outlets, lighting, small appliances, and home EV chargers.
- Three-Phase AC: Standard for commercial and industrial facilities (208V, 400V, or 480V). Use for motors, large HVAC systems, generators, and heavy machinery.
- DC Systems: Used in solar power installations, battery banks, automotive applications (12V, 24V, 48V), and telecommunications.
Step 2: Understand Power Factor (Critical for Accuracy)
Power factor (PF) measures how effectively electrical power is converted into useful work output. Ignoring power factor can cause 15–25% calculation errors for motor-driven or inductive loads.
Typical Power Factor Values by Load Type:
| Load Type | Typical Power Factor | When to Use |
|---|---|---|
| Resistive loads (heaters, toasters, incandescent bulbs) | 1.0 | Leave PF blank or enter 1.0 |
| Induction motors (full load) | 0.80–0.85 | Default calculator value |
| Fluorescent/LED lighting with electronic ballast | 0.90–0.95 | Commercial lighting circuits |
| Variable frequency drives (VFDs) | 0.90–0.95 | Modern motor control systems |
| Unloaded motors | 0.20–0.40 | Avoid calculating at no-load |
Step 3: Account for Motor Efficiency (Advanced Applications)
For precise motor nameplate calculations, include efficiency (η) in your formula:
Formula: Amps = (kW × 1,000) ÷ (Voltage × Power Factor × Efficiency)
Example:
7.5 kW motor, 400V three-phase, Power Factor 0.85, Efficiency 90%
Amps = (7.5 × 1,000) ÷ (1.732 × 400 × 0.85 × 0.9) = 14.1 A
Note: Formulas validated against NFPA 70 (NEC®) Article 430 and IEEE Std 141. For critical applications, always consult a licensed professional engineer.
Frequently Asked Questions
Do I need to enter power factor?
For resistive loads like heaters, toasters, or incandescent bulbs: No—leave blank or use PF = 1.0. For motors, compressors, fluorescent lighting, or any inductive load: Yes—use 0.8–0.95. When in doubt, 0.8 is a safe default for most industrial equipment.
Why is my calculated amp value different from the motor nameplate?
Motor nameplate amperage includes starting current surges (which can be up to 6× the running current) and built-in safety margins. Our calculator shows steady-state running current under rated load. For circuit breaker or wire sizing, multiply the calculated result by 1.25 per NEC® guidelines and consult a licensed electrician.
Is this calculator accurate for solar system design?
For DC side calculations (panels to charge controller), use the DC formula with system voltage (e.g., 48V). For AC side calculations (inverter output), use single-phase or three-phase formulas as appropriate. Always include a 20–25% safety margin for real-world conditions like temperature and shading.
Why Professionals Trust This Calculator
- Formulas verified against IEEE and NEC electrical standards
- Updated for 2026 electrical codes and international voltage standards
- Zero data collection—your calculations remain completely private
Disclaimer: This calculator provides estimates for planning and educational purposes. Electrical work involves serious safety risks. Always consult local electrical codes and a licensed electrician or professional engineer before installing, modifying, or sizing electrical equipment. MainConverter.com is not liable for errors, omissions, or outcomes related to the use of this tool.