Electricity Demand Calculator
Estimate the peak electricity demand of your home in kW.
About the Electricity Demand Calculator
Numbers should not slow you down. The Electricity Demand Calculator does the arithmetic for you and shows the result live, so you can focus on the decision rather than the maths.
Electrical load calculation tells you how much power your home or shop needs and whether your wiring, breakers and UPS can handle it. This Electricity Demand Calculator adds up the load of your appliances so you can size your electrical setup correctly.
The calculation totals the wattage of the appliances that run at the same time — the peak simultaneous load — which is the number that determines your main breaker, wire size and UPS capacity.
In Pakistani homes, the load grows with every appliance added: air conditioners alone can pull 1,500–2,500 W each. Knowing your total load prevents tripping breakers and guides decisions like upgrading the meter or choosing a UPS.
For solar sizing, the load calculation is equally essential: your system must cover the appliances you plan to run simultaneously, not the total of everything you own. This tool gives you that peak figure.
Use the Electricity Demand Calculator as often as you like — it is free, needs no account, and pairs well with the other calculators in this category for a fuller picture.
How to calculate electrical load
- 1
List the appliances you run at the same time and their wattage.
- 2
Add them in the tool as labelled.
- 3
Read the total load in watts and kW, updated live.
- 4
Use the figure to size breakers, UPS or solar.
Frequently Asked Questions
What is a diversity factor?
Not every appliance runs at once, so peak demand is lower than connected load. A 60% diversity factor means you draw about 60% of the rated load at peak.
What is the difference between connected load and demand load?
Connected load is the total wattage of everything installed; demand load is what actually runs at once. Circuits and UPS are sized on demand load — this tool calculates it.
How much load can a standard Pakistani meter handle?
Single-phase connections are typically rated for 5–12 kW depending on the connection type. Exceeding the meter's rating requires an upgrade application to your DISCO.