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Generator Fuel Usage Calculator
Estimate daily and monthly fuel consumption, storage requirements, and running costs for your off-grid generator.
Generator Specifications
Rated wattage and your typical operating load determine actual power output and fuel draw.
3.5 kW
W
50%
10% (light)50% (optimal)100% (full load)
Actual output: 1.75 kW
6 hrs/day
hrs
0.5 hr8 hrs (typical)24 hrs (continuous)
Fuel Type
Fuel type determines consumption rate, local cost, and storage requirements.
Store in approved jerry cans (20 L). Max recommended home storage: 200 L.
Fuel Summary
3.5 kW · 50% load · 6 hrs/day
Daily Energy Output
10.5kWh/day
Daily Fuel Usage
3.7L/day
0.61 L/hr at 50% load
Monthly Fuel Total
110.3L/mo
Est. Monthly Cost
₹10,126
Based on India gasoline (petrol) prices
Recommended Storage
200 L
Smallest standard tank covering your 30-day supply (111 L needed)
Calculation Assumptions
- Fuel consumption rates (gasoline 0.35 L/kWh, diesel 0.28 L/kWh, propane 0.42 L/kWh) are industry averages at the rated load. Actual consumption varies by generator brand, age, and maintenance state (±15–20%).
- Consumption scales linearly with load factor in this model. Real generators are slightly less efficient at very low loads (<30%) and near full load (>90%).
- Fuel prices are approximate regional averages in India. Prices fluctuate seasonally and regionally — use a local price for accurate cost estimates.
- Recommended storage is the smallest standard tank size that covers 30 days of supply. Local regulations may limit home fuel storage quantities — check with your authority.
- Generators typically achieve best efficiency (fuel per kWh) at 50–75% of rated load. Running a larger generator at low load wastes fuel — consider right-sizing.