Generator Fuel Cost Calculator

A generator fuel cost per hour calculator petrol Pakistan that prices every hour your generator runs. Use the free Generator Fuel Cost Calculator below — enter your values and get instant results, right in your browser. Fuel per hour (L) = load (kW) × specific consumption (petrol 0.35 L/kWh, diesel 0.27 L/kWh). Cost per hour = fuel per hour × price per litre. Daily cost = cost per hour × hours. Example: 4 kW × 0.35 = 1.4 L/h × Rs 260 = Rs 364/hour.

How to use the Generator Fuel Cost Calculator

Generators feel cheap until you add up the fuel — a medium petrol generator can burn through thousands of rupees in a single load-shedding evening. This generator fuel cost per hour calculator petrol Pakistan multiplies your actual load by typical fuel consumption per kWh and the current pump price to show the cost per hour and per day. Compare the daily figure against a solar-battery setup's cost and the generator usually loses within two years.

  1. Enter the average load your generator carries in kW (not its rated size — the actual load).
  2. Select petrol or diesel from the fuel type dropdown.
  3. Enter the current fuel price per litre from the pump.
  4. Enter how many hours per day the generator runs during load shedding.
  5. Click Calculate to see fuel per hour, cost per hour, and total daily fuel cost.

Formula

Fuel per hour (L) = load (kW) × specific consumption (petrol 0.35 L/kWh, diesel 0.27 L/kWh). Cost per hour = fuel per hour × price per litre. Daily cost = cost per hour × hours. Example: 4 kW × 0.35 = 1.4 L/h × Rs 260 = Rs 364/hour.

Worked example

A 5 kVA petrol generator carrying a 4 kW load burns 4 × 0.35 = 1.4 litres per hour. At Rs 260/litre that is Rs 364 per hour, or Rs 1,456 for a 4-hour load-shedding evening — Rs 43,680 per month. A diesel unit on the same load costs about Rs 281/hour, saving roughly Rs 10,000 monthly.

Frequently asked questions

At a typical 4 kW (75%) load, about 1.4 litres per hour. At full 5 kW load it rises to ~1.75 L/h, and at light loads the per-kWh consumption is worse — generators are most efficient at 70–80% load.

Yes — diesel generators use ~0.27 L/kWh versus ~0.35 for petrol, and diesel engines last longer. Diesel units cost more upfront but pay back quickly with daily use of 3+ hours.

Solar + batteries cost more upfront (Rs 400,000+ for a basic home setup) but near-zero running cost. A petrol generator at Rs 364/hour costs over Rs 40,000/month in fuel alone during heavy load shedding — solar typically wins within 18–24 months.

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