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Appliance Load Calculator

This calculator helps you estimate the total electrical load of all appliances in a home or office. You list each appliance's power rating and quantity, then sum them up. It is used to size wiring, breakers, and inverters, and to estimate energy consumption and monthly bills. With hundreds of appliances in its database, it makes load planning quick and accurate.

Written by the Vorzep Team

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Find & Add Appliances

0 shown
Add custom appliance
Quick load presets

Load Box 0

No items added yet.
Search & tap an appliance to add it.
Max Demand (total W) 0 W
Single‑phase 0 W
Three‑phase 0 W
Daily Energy 0.00 kWh
Monthly Energy 0.0 kWh
Monthly bill $0.00 / month
Based on per‑appliance hours · 0.000 avg kW

How to use this tool – step by step

Why do I need this?

  • Plan your home or office electrical load before buying appliances.
  • Avoid overloading circuits – know your total wattage and phase distribution.
  • Estimate your monthly electricity bill with per‑appliance usage hours – microwaves and irons only run for minutes, while ACs run for hours.
  • Compare inverter vs traditional appliances and see the savings instantly.

What does it give you?

  • Instant load summary – total watts (W) and kilowatts (kW) of all appliances combined.
  • Phase breakdown – see single‑phase and three‑phase loads separately.
  • Accurate monthly bill – based on each appliance's own daily hours.
  • Essential appliance list – curated for homes and offices (LEDs, fans, ACs, fridges, desktops, etc.).
  • Add custom appliances – if your item isn't listed, add it yourself with name, wattage, and phase.

Step‑by‑step guide

  • 1. Search – Type any appliance name (e.g. "fan", "ac", "led") in the search box. The list updates instantly.
  • 2. Filter – Use the phase buttons to show only single‑phase or three‑phase items.
  • 3. Add – Tap any appliance card or its + Add button to put one unit in your Load Box.
  • 4. Set hours – In the Load Box, enter the daily usage hours for each appliance (e.g., 0.25 for microwave, 8 for AC, 24 for fridge).
  • 5. Adjust quantities – Use + and − buttons to change the number of each item.
  • 6. See totals – The summary shows total wattage (max demand), daily energy (kWh), and monthly energy.
  • 7. Calculate bill – Enter your rate ($/kWh) and days per month. The monthly bill updates automatically.
  • 8. Add custom – Use the form below the appliance grid to add any appliance not in the list.
  • 9. Clear & restart – Click Clear to empty your Load Box and start over.

What can you do after using it?

  • Optimize your usage – adjust hours to reflect your actual habits and see the bill change.
  • Compare appliances – see the cost difference between inverter and non‑inverter models.
  • Size your solar system – use daily kWh consumption to design your solar array and battery backup.
  • Right‑size your UPS / generator – know exactly how much backup capacity you need (in kW).
  • Share with an electrician – get accurate numbers for wiring, breaker sizing, and phase balancing.

Worked Examples – Detailed Real‑life Scenarios

Small Apartment
Scenario: 1‑bedroom, 2 occupants.
Appliances & daily hours:
  • 6× LED Bulb 10W 4 h/d
  • 2× Ceiling Fan 75W 6 h/d
  • 1× Refrigerator 150W 24 h/d
  • 1× Smart TV 55" 100W 3 h/d
  • 1× Microwave 1200W 0.25 h/d
Rate: $0.15/kWh · Days: 30
Monthly bill ~$17.80 Max load 1.6 kW
Daily: 3.96 kWh Monthly: 118.8 kWh Avg. $0.59/day
Large Home (Inverter AC)
Scenario: 4‑bedroom, 5 occupants.
Appliances & daily hours:
  • 12× LED Bulb 10W 4 h/d
  • 4× Ceiling Fan 75W 6 h/d
  • 2× AC 1.5T Inverter (1500W) 8 h/d
  • 1× Refrigerator 150W 24 h/d
  • 1× Geyser 3000W 1 h/d
Rate: $0.15/kWh · Days: 30
Monthly bill ~$94.50 Max load 7.2 kW
Daily: 21.0 kWh Monthly: 630 kWh Avg. $3.15/day
Small Office
Scenario: 4‑person office, 8‑hour workday.
Appliances & daily hours:
  • 4× Desktop PC 300W 8 h/d
  • 4× Monitor 50W 8 h/d
  • 1× WiFi Router 15W 24 h/d
  • 6× LED Panel 30W 8 h/d
  • 1× AC 1T Inverter 1000W 8 h/d
Rate: $0.15/kWh · Days: 30
Monthly bill ~$80.10 Max load 4.0 kW
Daily: 17.8 kWh Monthly: 534 kWh Avg. $2.67/day
Workshop (3‑Phase)
Scenario: Light industrial, 2 shifts.
Appliances & daily hours:
  • 1× Compressor 2000W (3Φ) 2 h/d
  • 1× Welder 3000W (3Φ) 0.5 h/d
  • 1× Industrial Machine 3000W (3Φ) 2 h/d
  • 4× LED Panel 30W 6 h/d
Rate: $0.12/kWh · Days: 30
Monthly bill ~$28.10 Max load 8.0 kW (3Φ)
Daily: 7.8 kWh Monthly: 234 kWh Avg. $0.94/day
Commercial Retail
Scenario: Small retail shop, 12‑hour operation.
Appliances & daily hours:
  • 10× LED Panel 30W 12 h/d
  • 2× AC 2T Inverter 2000W 10 h/d
  • 1× Refrigerator 150W 24 h/d
  • 1× POS System 100W 12 h/d
Rate: $0.14/kWh · Days: 30
Monthly bill ~$86.40 Max load 5.3 kW
Daily: 20.6 kWh Monthly: 618 kWh Avg. $2.88/day
EV + Solar Home
Scenario: Modern home with EV charging.
Appliances & daily hours:
  • 8× LED Bulb 10W 5 h/d
  • 3× Ceiling Fan 75W 6 h/d
  • 1× AC 1.5T Inverter 1500W 6 h/d
  • 1× Refrigerator 150W 24 h/d
  • 1× EV Charger 7kW 2 h/d
Rate: $0.12/kWh · Days: 30
Monthly bill ~$63.70 Max load 11.2 kW
Daily: 17.7 kWh Monthly: 531 kWh Avg. $2.12/day

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  • Published July 20, 2026
  • Last updated July 21, 2026