Result
$27.00
Generator fuel costs about $27.00 for this runtime.
- Fuel used
- 7.5 gal
- Runtime
- 10 hours
Estimate only. Verify ratings, ventilation, fuel handling, and manufacturer safety instructions before use. Read the full disclaimer.
More
Optional planning mode Plan changing fuel-use periods Combine up to four operating segments with different burn rates, runtimes, and load factors.
Plan result
6 gallons planned
2 operating segments cost about $21.60 at the entered fuel price.
- Total runtime
- 10 hours
- Average burn
- 0.6 gal/hr
- Fuel cost
- $21.60
Calculation boundary: Use a load factor of 1 when a segment's gallons-per-hour figure already represents that segment's planned load.
This plan stays on this page. It is not added to the URL, shared-result links, saved calculators, or analytics events.
About this calculator
Estimate what it costs to run a portable generator for an outage, job site, or camping setup.
At a glance
- Cost
- Free
- Login
- Not required
- Best use
- Estimate generator fuel cost from fuel burn rate, runtime, fuel price, and load factor.
- Output
- Browser result with print and PDF options
- Reviewed
- 2026-08-29
Result summary
Quick answer
With the sample inputs, this calculator returns $27.00. Fuel used: 7.5 gal. Multiply the entered fuel-burn rate by runtime and the load factor, then price the resulting gallons at the entered fuel price.
Publisher Published by EverydayCalc Editorial Editorial standards and limitations
Each calculator shows its formula and defines the inputs. Worked examples make the math checkable. The page also names the limits that can change the result.
Last calculation review:
Instructions
How to use this calculator
Open the short walkthrough for choosing and checking inputs.
The calculator multiplies fuel burn rate by runtime, adjusts for load, and applies fuel price.
Page guide
On this page
Jump directly to the part of the calculator you need.
Calculation details
Formula and methodology
See the exact math used to produce the result.
Fuel used = gallons per hour multiplied by runtime multiplied by load factor. Fuel cost = fuel used multiplied by fuel price.
Before acting
Assumptions to check
Review the real-world details that can change the estimate.
The entered gallons-per-hour figure and load factor must describe the same operating basis. Use a load factor of 1 when the burn rate already represents the planned load so fuel use is not adjusted twice.
More guidance Examples, methodology, and planning checks Open the worked example, review notes, reference tables, and practical next checks.
What to verify before acting
Treat the result as a fuel-planning estimate and compare it with the generator manufacturer's consumption data at the expected load.
When to use this calculator
- Estimating fuel for an outage window
- Comparing runtime scenarios at one documented burn rate
- Planning fuel cost for a job site or camping setup
Tips for better estimates
- Match the burn-rate source to the generator fuel and expected load.
- Do not apply a second load adjustment to an already load-specific burn rate.
- Plan reserve fuel separately instead of hiding it in the formula.
How this calculator is reviewed
This page is checked for inputs, formulas, examples, assumptions, topic fit, and related links. For this calculator, the review also covers prices, quantities, billing periods, recurring charges, usage patterns, fees, and sample totals.
The sample result is covered by automated tests, and the page links to related calculators and, where available, supporting guides so readers can check the assumptions before acting. If a formula, label, or assumption looks off, send the page URL and your inputs through the contact page.
Worked example
Example inputs: Fuel burn: 0.75 gal/hr; Runtime: 10 hours; Fuel price: $3.6 /gal; Load factor (use 1 if already adjusted): 1. With those values, the calculator returns $27.00. Generator fuel costs about $27.00 for this runtime.
Appliance wattage to estimated monthly cost
| 100 watts for 8 hours/day | About $3.90/month at $0.16/kWh |
|---|---|
| 500 watts for 8 hours/day | About $19.47/month at $0.16/kWh |
| 1,000 watts for 8 hours/day | About $38.93/month at $0.16/kWh |
| 1,500 watts for 8 hours/day | About $58.40/month at $0.16/kWh |
Example scenarios
- Use a manufacturer burn rate measured at a stated load when available.
- Enter the full expected runtime, including planned refueling intervals.
- Keep reserve fuel separate from the modeled consumption total.
Quick reference chart
| Sample result | $27.00 |
|---|---|
| Fuel used | 7.5 gal |
| Runtime | 10 hours |
| Best next step | Treat the result as a fuel-planning estimate and compare it with the generator manufacturer's consumption data at the expected load. |
FAQs
Generator Fuel Cost Calculator questions
What gallons-per-hour value should I use?
Use the generator manufacturer's fuel-consumption figure at a load close to the one you expect, or a measured burn rate from the same setup.
When should the load factor be 1?
Use 1 when the entered gallons-per-hour value already reflects the planned operating load. Applying another reduction would understate fuel use.
Does this predict outage runtime?
No. It prices the entered fuel-use scenario. Tank capacity, usable fuel, changing loads, maintenance, temperature, and refueling access can change actual runtime.
More resources Saved tools and additional links Open optional follow-ups, common mistakes, and more calculators.
Saved tools
Saved calculators
- No saved calculators yet.
Recent tools
Recent calculators
- Recent calculators will appear here.
Common planning mistakes
Using an electricity rate, treating one fuel-burn figure as a full load curve, applying the load factor twice, or calling the result a guaranteed runtime.
Was this calculator helpful?
Suggest an improvementNotice an issue with this calculator? Contact us here.