Energy and utility operations
Fuel reserve operating runtime
Estimate constant-consumption runtime from usable fuel and a measured or supplied matching burn rate.
Your inputs
Complete the fields for your selected method. Zero means intentionally zero, not unknown. Currency selection labels amounts; it does not convert exchange rates.
How this calculation works
runtime = (fuel available - fuel held in reserve)/matching fuel use per hour
Use the same fuel and operating load as the consumption reading. A specification is an estimate, not actual measured burn. No emergency-readiness guarantee, fuel-storage approval, engine-load forecast or operating safety recommendation is supplied. Use your own records for the same scope and period. Example figures are illustrative, not industry benchmarks. Results exclude income taxes and any cost you have not entered. Check the result before pricing work or committing resources.
What information do I need?
Use records for the same job, equipment or accounting period. Only the fields for your selected entry method are required. An unknown amount is not zero.
Input definitions and where to find them
- Fuel currently available (US gal): Use measured dimensions or quantities and select their actual units. Do not mix dry and wet weight or capacity and actual consumption.
- Fuel intentionally held out of use (US gal): Use measured dimensions or quantities and select their actual units. Do not mix dry and wet weight or capacity and actual consumption.
- Measured matching-load fuel use (US gal/hour): Use measured dimensions or quantities and select their actual units. Do not mix dry and wet weight or capacity and actual consumption.
Use the Where to find this value controls beside the inputs for available work-it-out helpers. Estimates remain your assumptions; a helper does not verify the source figures.
Worked example
Example amounts use US dollars (USD).
Example answer: Runtime at constant entered consumption is 9.00 hours for the illustrative inputs below.
Example inputs
- Fuel currently available: 26.417205235815 US gal
- Fuel intentionally held out of use: 2.641720523581 US gal
- Measured matching-load fuel use: 2.641720523581 US gal/hour
- Runtime at constant entered consumption
- 9.00 hours
- Usable fuel above reserve
- 23.78 US gal
These illustrative values are not recommended rates or industry averages. Replace every example input with your own figures.
Use the result well
Estimate constant-consumption runtime from usable fuel and a measured or supplied matching burn rate. Inputs come from your own records and stated assumptions; no rates or legal limits are looked up.
Keep inputs on the same scope and time basis. Calculations retain precision internally; displayed values generally round to two decimal places, with extra precision for very small values and whole-unit rounding where required. Economic comparisons describe your supplied assumptions and do not guarantee future results.
This tool provides business arithmetic. It does not approve engineering designs, establish legal or tax treatment, select equipment or certify safe operating conditions.