Amps (A) to kilowatts (kW) calculator.
| Device | Typical power factor |
|---|---|
| Resistive load | 1 |
| Fluorescent lamp | 0.95 |
| Incandescent lamp | 1 |
| Induction motor full load | 0.85 |
| Induction motor no load | 0.35 |
| Resistive oven | 1 |
| Synchronous motor | 0.9 |
For 3-phase systems, use the formula: kW = (Amps × Voltage × √3 × Power Factor) ÷ 1000, where √3 equals 1.732 for balanced three-phase loads. This formula accounts for the phase relationship in three-phase electrical systems and provides accurate power calculations for motors, transformers, and industrial equipment.
To convert amps to kW at 240V, use the formula: kW = (Amps × 240V × Power Factor) ÷ 1000 for single-phase systems. For example, 10 amps at 240V with 0.8 power factor equals 1.92 kW, making this calculation essential for residential and commercial electrical load planning.
For 1 kW in a 3-phase system, the current equals Amps = (1000W) ÷ (√3 × Voltage × Power Factor), typically resulting in 1.4-2.4 amps depending on voltage and power factor. At 415V with 0.8 power factor, 1 kW draws approximately 1.73 amps in a balanced three-phase configuration.
Converting 10 amps to kW requires knowing the voltage and power factor: kW = (10A × Voltage × PF) ÷ 1000 for single-phase systems. At 240V with 0.8 power factor, 10 amps equals 1.92 kW, while at 120V it equals 0.96 kW for typical household applications.
For 12V DC systems, the conversion formula is: kW = (Amps × 12V) ÷ 1000, since DC systems don’t require power factor considerations. For example, 50 amps at 12V equals 0.6 kW, commonly used in automotive, marine, and solar battery calculations.
Converting 240 amps to kW depends on system voltage: kW = (240A × Voltage × PF) ÷ 1000 for AC systems. At 240V single-phase with 0.8 power factor, 240 amps equals 46.08 kW, typically found in large residential or small commercial electrical panels.
Single-phase conversion uses kW = (A × V × PF) ÷ 1000, while 3-phase uses kW = (A × V × √3 × PF) ÷ 1000. The √3 factor (1.732) accounts for the phase relationship in 3-phase systems, making them more efficient for high-power applications.
Power factor (PF) represents the efficiency of AC power usage, ranging from 0 to 1, with resistive loads having PF=1 and inductive loads having lower values. Including power factor ensures accurate real power calculations, as kW = (A × V × PF) ÷ 1000 reflects actual consumed power versus apparent power.
At 220V, 1 amp converts to kW using: kW = (1A × 220V × PF) ÷ 1000, resulting in 0.176 kW with 0.8 power factor. This calculation is essential for European and international electrical systems where 220V is the standard residential voltage.
Converting 10 amps at 220V: kW = (10A × 220V × 0.8 PF) ÷ 1000 = 1.76 kW for typical resistive loads. This conversion is crucial for appliance sizing and electrical load calculations in 220V electrical systems worldwide.
The kW value of 1 amp depends on voltage and power factor: kW = (1A × Voltage × PF) ÷ 1000. At 120V it’s 0.096 kW, at 240V it’s 0.192 kW, and at 480V it’s 0.384 kW, demonstrating why voltage specification is essential for accurate power calculations.
To find amps in 1kW: Amps = 1000W ÷ (Voltage × Power Factor) for single-phase, or Amps = 1000W ÷ (√3 × Voltage × PF) for 3-phase. At 240V single-phase with 0.8 PF, 1kW equals 5.2 amps, while at 415V 3-phase it equals 1.73 amps.
Convert amps to kilowatts using Watt’s Law: kW = (Amps × Voltage × Power Factor) ÷ 1000 for single-phase AC systems. For 3-phase systems, multiply by √3 (1.732), and for DC systems, omit the power factor since it equals 1.
200 amps converts to kW based on system specifications: kW = (200A × Voltage × PF) ÷ 1000 for single-phase systems. At 240V with 0.8 power factor, 200 amps equals 38.4 kW, commonly seen in residential main electrical panels and service entrances.
Motor kW calculations require considering efficiency and power factor: kW = (A × V × PF × Efficiency) ÷ 1000 for single-phase, or multiply by √3 for 3-phase motors. Typical motor power factors range from 0.7-0.9, and efficiencies from 0.8-0.95 depending on motor size and type.
Solar system calculations use DC formulas: kW = (Amps × DC Voltage) ÷ 1000, since solar panels produce DC power without power factor considerations. For battery banks at 12V, 24V, or 48V, this direct calculation provides accurate power ratings for system sizing and performance analysis.