Generator Size Calculator
Find the right generator size (kVA) for your home load in Pakistan.
About the Generator Size Calculator
If you have ever wanted a fast, reliable Generator Size 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.
A generator is the standby power solution for homes and businesses across Pakistan, and sizing it correctly avoids two expensive mistakes: buying one too small that overloads, or too large that wastes fuel. This Generator Size Calculator sizes your generator from your load requirements.
The calculation adds your running load and applies the standard safety margin — generators should run at 70–80% of capacity, never flat out — to arrive at the right kVA or kW rating.
Fuel consumption follows the load: a generator under light load burns less per hour but costs more per unit of useful power. Sizing it to your typical load, not your peak, balances cost and reliability.
Match the result to the generator's rated output (kVA) — convert kW to kVA by dividing by the power factor, typically 0.8 for single-phase generators used in Pakistani homes.
The Generator Size Calculator is one of a large, connected suite of Pakistani calculators on GuruAlpha, so if a related figure comes up next, the tool for it is a click away.
How to size a generator
- 1
Enter the total load of the appliances you must run during outages.
- 2
Read the recommended generator size in kW and kVA, updated live.
- 3
Choose a generator rated at or above the kVA figure.
Frequently Asked Questions
How do I size a generator?
Add your essential load (lights, fans, fridge, TV, one AC), add 25% headroom, and account for motor starting surge — a 2.5 kW load typically needs a 3.1 kVA generator.
How do I convert kW to kVA for a generator?
Divide kW by the power factor — usually 0.8 for single-phase generators. So a 5 kW load needs a generator rated at about 6.25 kVA.
Should I size a generator for peak or typical load?
Size for the appliances you genuinely need during an outage, plus a 20–30% margin. Sizing for every appliance in the house makes the generator expensive to buy and wasteful on fuel.