Maximum Load Calculator
Find the maximum simultaneous electrical load and the breaker size you need.
About the Maximum Load Calculator
If you have ever wanted a fast, reliable Maximum Load Calculator that works on your phone without sign-ups or ads getting in the way, this is it — the figures update the moment you type.
Electrical load calculation tells you how much power your home or shop needs and whether your wiring, breakers and UPS can handle it. This Maximum Load 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.
For the most accurate outcome from the Maximum Load Calculator, keep the editable rates and defaults up to date with current figures before reading the result.
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
How do I size a circuit breaker?
Divide your load in watts by the voltage to get amps, then add ~25% headroom. A 3,500 W load at 220 V draws ~16 A, so a 20 A breaker is appropriate.
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.