Single Phase Power Calculator | kW, kVA, kVAR, PF, Current

📖 Single Phase Power Calculator

Single-phase power systems are used in most residential homes and small commercial buildings. This tool computes real power (kW), apparent power (kVA), reactive power (kVAR), power factor (PF), and current for single-phase circuits.

📐 Single Phase Power Formulas

P = V × I × PF | S = V × I | Q = V × I × sin(θ)

Where:
P = Real Power (kW) S = Apparent Power (kVA) Q = Reactive Power (kVAR)
V = Voltage (V) I = Current (A) PF = Power Factor = cos(θ)

📊 Common Single Phase Loads

Equipment	Voltage (V)	Current (A)	PF	Power (kW)
Home (Typical)	230	10	0.90	2.07
AC Unit (1.5 Ton)	230	8	0.85	1.56
Water Heater	230	15	1.0	3.45
Refrigerator	230	2	0.80	0.37
Washing Machine	230	5	0.85	0.98
LED Lighting (10 bulbs)	230	0.5	0.95	0.11

💡 Single Phase vs Three Phase

Parameter	Single Phase	Three Phase
Voltage	230V (India/UK), 120V (USA)	415V (India), 208V/480V (USA)
Power Formula	P = V × I × PF	P = √3 × V × I × PF
Common Use	Residential homes	Industrial, commercial
Efficiency	Lower	Higher
Motor Starting	Requires capacitor	Self-starting

🔧 How to Use This Calculator

Enter voltage (V) - standard: 230V in India, 120V in USA
Enter current (A) - from your load
Enter power factor (PF) - 1.0 for resistive loads, 0.8-0.9 for motors
Select frequency - 50Hz (India/UK) or 60Hz (USA)
Results include kW, kVA, kVAR, and power factor status

📌 Power Factor Guide

PF Range	Status
0.95 - 1.00	✅ Excellent
0.85 - 0.95	👍 Good
0.75 - 0.85	📘 Average
0.60 - 0.75	⚠️ Poor
Below 0.60	❌ Very Poor

❓ Frequently Asked Questions (FAQ)

❓ Single phase power formula? ▼

P = V × I × PF. For resistive loads (PF=1), P = V × I. Power is measured in Watts (kW).

❓ What is standard single phase voltage in India? ▼

The standard single-phase voltage in India is 230V at 50Hz. In the USA, it's 120V at 60Hz.

❓ How to calculate single phase current? ▼

I = P / (V × PF), where P is power in watts, V is voltage, and PF is power factor.

❓ What is a typical power factor for home appliances? ▼

Lighting (LED): 0.95+, Motors (AC, fridge): 0.80-0.85, Heaters: 1.0, Computers: 0.70-0.90.

❓ What is kVA to kW conversion? ▼

kW = kVA × PF. For example, 10 kVA at PF 0.85 = 8.5 kW. Use this calculator to convert automatically.

❓ Single phase vs three phase - which is better for homes? ▼

Single phase is sufficient for most homes. Three phase is used for heavy loads like large AC units, workshops, and commercial buildings.