Generator Fuel Storage Duration Calculator — How Long Will Stored Fuel Last?
Estimate how many days or weeks your stored generator fuel can support planned consumption before reaching a defined minimum reserve.
Fuel inventory and usage
Why fuel inventory duration needs a reserve
Using the full physical inventory as available fuel can overstate practical resilience. A minimum reserve creates a clear threshold for replenishment planning.
Contingency rate
The optional contingency increases the average daily consumption to account for a deliberately conservative planning scenario.
Support period
Comparing calculated duration with a required outage period shows whether current inventory provides enough modeled coverage.
Replenishment
The replenishment quantity estimates how many additional days the delivery could support at the planning rate.
Limitations
Fuel storage considerations can involve quality, temperature, tank condition, regulatory requirements and supplier logistics that are outside this calculator.
Frequently asked questions
Can inventory be zero?
Yes, producing zero available duration.
Can the contingency be zero?
Yes. Zero means the entered daily rate is used directly.
Does the calculator account for fuel deterioration?
No. It only models quantity and consumption.