How to do Electrical load calculations for House (Formula + Example + Calculator)
Learn how to electrical load calculations for house using formula, example, and calculator. Includes appliance table and step-by-step guide.
1. ✅ Quick Answer
To calculate electrical load for a house:
👉 Step-by-step:
- List all electrical appliances
- Add total wattage
- Convert to kW
- Calculate current using formula
👉 Formula:
👉 I = P / (V × PF)
Where:
- I = Current (Ampere)
- P = Power (Watts)
- V = Voltage (230V)
- PF = Power Factor (0.8–0.9)
2. 📊 Appliance Load Chart (VERY IMPORTANT)
| Appliance | Power (W) |
|---|---|
| Fan | 75 |
| LED Light | 20 |
| TV | 100 |
| Refrigerator | 300 |
| AC | 1500 |
| Washing Machine | 500 |
⚡ Electrical Load Calculator (MEPWORK – Pro with Diversity)
Calculate connected load, demand load (with diversity factor), current, cable size, and MCB selection.
| Appliance | Watt | Qty | Total (W) |
|---|---|---|---|
| LED Light | 20 | 0 | |
| Fan | 75 | 0 | |
| TV | 100 | 0 | |
| Refrigerator | 300 | 0 | |
| AC | 1500 | 0 | |
| Washing Machine | 500 | 0 | |
| Geyser | 2000 | 0 | |
| Pump | 750 | 0 | |
| Connected Load | 0 | ||
3. 🧠 What is Electrical Load Calculation?
Electrical load calculation is the process of estimating total power consumption of a building.
It helps to:
- Select proper cable size
- Design electrical panel
- Avoid overload
👉 Used in:
- Houses
- Apartments
- Commercial buildings
4. 📐 Formula (Elcectrical Load Calculations Formula)
👉 Power (kW) = Total Watt / 1000
👉 Current Formula:
👉 I = P / (V × PF)
👉 This is the main load calculation formula
5. 🧮 Step-by-Step Calculation
Step 1: List appliances
- 5 Fans = 375W
- 5 Lights = 100W
- 1 AC = 1500W
- 1 Fridge = 300W
Step 2: Total Load
👉 Total = 2275 Watts
👉 Convert:
👉 2275 / 1000 = 2.275 kW
Step 3: Calculate Current
👉 I = 2275 / (230 × 0.9)
👉 I ≈ 11 Amp
Step 4: Select Cable
👉 Use 2.5 sqmm or 4 sqmm cable
6. 📊 Electrical Load Calculations Example
🏠 House Example
- Total load = 2.3 kW
👉 Required current = ~11 A
👉 Use:
✔ MCB = 16A
✔ Cable = 2.5 sqmm
🏢 Apartment Example
- Load = 10 kW
👉 Current:
👉 10000 / (230 × 0.9) ≈ 48 A
👉 Use:
✔ 10 sqmm cable
7. 🏗 Diagram / Load Distribution
Main DB panel
Circuit distribution
Load flow
8. 📥 Download Electrical Load Calculator Excel
👉 Download Electrical Load Calculations Excel Sheet
⚡Electrical Load Calculation Excel Free Download 228.50 KB 45 downloads
🔌 Introduction Electrical load calculation is one of the most important steps...Includes:
✔ Automatic load calculation
✔ Appliance input
✔ Current calculation
✔ Cable suggestion
👉 Perfect for engineers & students
9. ❓ FAQ
How to calculate electrical load?
👉 Add total wattage and apply formula:
👉 I = P / (V × PF)
How to estimate home electrical load?
👉 List appliances and sum total watt.
What is electrical load calculation?
👉 It is the total power consumption of a building.
What is load calculation formula?
👉 Power = Watt / 1000
👉 Current = P / (V × PF)
What is electrical load capacity calculator?
👉 A tool to calculate current based on load.
How to calculate electrical load of a house in India?
👉 Use 230V supply and 135 LPCD method for estimation.

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