Dual Fuel Generator Cost Calculator
A dual fuel generator can run on gasoline or propane, giving you options when fuel availability or storage needs change. The purchase price is only part of the expense, though. Installation and the fuel used during outages, work projects, or recreational trips can add substantially to the amount you spend over time.
The Dual Fuel Generator Cost Calculator estimates those costs over a chosen ownership period. Enter the generator price, setup cost, expected operating hours, and fuel information to see an Estimated Total Cost. The result is useful for planning and comparing scenarios, provided you treat the inputs as estimates rather than guaranteed costs.
What the Dual Fuel Generator Cost Calculator does
The calculator adds the upfront cost of buying and setting up a generator to the estimated fuel cost over the years you expect to own it. It uses one fuel consumption rate and one fuel price at a time, so the result represents a scenario in which the entered hours are powered by either gasoline or propane.
For example, you can estimate the cost of a portable dual fuel generator used mainly for home backup. You can also run the numbers again using a propane consumption rate and propane price to compare that scenario with gasoline. The calculator does not automatically determine which fuel you plan to use or how often you will switch between them.
The estimate assumes that your annual operating hours, fuel consumption rate, and price per gallon stay the same throughout the ownership period. Actual costs can differ because generator load, runtime, and fuel prices change. The calculator also excludes maintenance, repairs, storage, financing, and resale value.
How to use the Dual Fuel Generator Cost Calculator
Gather a purchase price, an estimated setup cost, and fuel consumption information for the generator and fuel you are considering. Then enter these six values:
- Generator purchase price ($): Enter the amount you expect to pay for the generator itself. If you already own it, you can use its original purchase price to estimate the total cost of ownership, or enter zero to focus on future setup and fuel costs.
- Installation and setup cost ($): Enter your estimated one-time setup expenses. Depending on your situation, this might include accessories or professional installation work. Use zero if you do not expect any setup costs.
- Operating hours per year: Estimate how many hours you will run the generator in a typical year. Consider outages, planned use, and routine running time where relevant. The calculator applies the same number of hours to every year in the ownership period.
- Fuel consumption at expected load (gallons per hour): Enter the consumption rate for the fuel you expect to use and the electrical load you anticipate. Manufacturer information may provide rates at specified loads. A rate measured at a different load may not reflect your actual use.
- Selected fuel price ($ per gallon): Enter your assumed price per gallon for the same fuel used in the consumption field. Use a gasoline price with a gasoline consumption rate, or a propane price with a propane consumption rate.
- Ownership period (years): Enter the number of years you want the estimate to cover. The calculator uses this period to project fuel spending, while adding purchase and setup costs once.
Review the resulting Estimated Total Cost as a planning figure. The default values are illustrative assumptions, not a promise of a particular generator’s fuel use or a current fuel price. Replace them with numbers that fit your equipment and expected use.
How the Dual Fuel Generator Cost Calculator formula works
The formula combines two one-time costs with fuel spending over the ownership period:
Estimated Total Cost = Generator purchase price + Installation and setup cost + (Operating hours per year × Fuel consumption in gallons per hour × Fuel price per gallon × Ownership period in years)
Multiplying annual hours by gallons per hour gives an estimated number of gallons used each year. Multiplying that figure by the price per gallon gives annual fuel cost. The calculator then multiplies annual fuel cost by the number of years and adds the purchase and setup costs.
Worked example using the default assumptions
Suppose you enter the calculator’s illustrative default values:
- Generator purchase price: $800
- Installation and setup cost: $300
- Operating hours per year: 100 hours
- Fuel consumption at expected load: 0.6 gallons per hour
- Selected fuel price: $3.50 per gallon
- Ownership period: 5 years
At those assumed inputs, the generator uses 100 × 0.6 = 60 gallons per year. Annual fuel cost is 60 × $3.50 = $210. Over five years, the estimated fuel cost is $210 × 5 = $1,050.
Adding the $800 purchase price and $300 setup cost produces an Estimated Total Cost of $2,150.00. This example assumes the same runtime, consumption rate, and fuel price in each of the five years.
Use cases for the Dual Fuel Generator Cost Calculator
Planning for home backup power
Outages can be difficult to predict, so an annual runtime estimate is necessarily uncertain. Try a low-use scenario and a higher-use scenario to see how fuel spending might affect your budget. Keep the purchase and setup assumptions consistent if your goal is to isolate the effect of extra operating hours.
Comparing gasoline and propane
Run the calculator once with the expected gasoline consumption rate and gasoline price. Then run it again with the expected propane consumption rate and propane price. Keep the purchase price, setup cost, hours, and years the same if you want to compare the fuel scenarios on a consistent basis.
Use the appropriate consumption rate for each fuel: a generator may consume gasoline and propane at different rates under comparable conditions. The cheaper fuel per gallon does not automatically produce the lower operating cost if its consumption rate is higher.
Comparing generator purchases
If you are considering two models, enter each model’s purchase price, anticipated setup cost, and estimated consumption at your expected load. Use the same annual hours, ownership period, and fuel-price assumption to make the comparison easier to interpret. A lower purchase price can be attractive, but fuel use may become more significant as runtime increases.
Estimating mixed-fuel use
The calculator estimates one fuel at a time. If you expect to use both fuels, calculate each fuel scenario separately using its own annual hours, consumption rate, and price. For the second calculation, enter zero for purchase and setup costs, then add the two results. This counts the one-time costs only once. The combined annual hours should represent your total expected use.
Other factors to consider when calculating Estimated Total Cost
Electrical load affects fuel use. A single gallons-per-hour figure is an average assumption. Your generator may use fuel at a different rate when powering a small set of appliances than when running closer to its capacity. Choose a rate that reflects your expected load as closely as possible, and consider alternative estimates if your load will vary.
Runtime may vary from year to year. An unusually long outage or a change in how you use the generator can make actual operating hours much higher or lower than your annual estimate. Testing several hour assumptions can help you understand that uncertainty.
Fuel prices can change. The calculator applies one price per gallon to the entire ownership period. It does not forecast increases, decreases, or differences between purchases. For propane, make sure the price and consumption rate are both expressed per gallon.
The result is not a complete lifetime budget. Maintenance, repairs, storage, financing, and resale value are excluded. You may want to estimate those items separately when comparing the broader cost of ownership. Installation and setup costs can also vary with your equipment and intended use, so use an estimate suited to your situation.
Frequently asked questions about the Dual Fuel Generator Cost Calculator
Does the calculator include both gasoline and propane automatically?
No. Each calculation uses one consumption rate and one price per gallon. To compare gasoline with propane, run separate calculations for each fuel. To estimate a mixture of both, use separate calculations and count the purchase and setup costs only once.
How do I find the right fuel consumption rate?
Check the generator manufacturer’s information for the selected fuel and a load close to what you expect to run. If the information is given as runtime for a known number of gallons, divide gallons by runtime in hours to estimate gallons per hour. Treat the result as an assumption because actual load and operating conditions can differ.
Should I enter the same consumption rate for gasoline and propane?
Use a fuel-specific rate when one is available. The calculator does not convert between fuels or adjust consumption automatically. Enter the gasoline rate and price for a gasoline scenario, and the propane rate and price for a propane scenario.
What happens if I enter zero operating hours?
The estimated fuel cost becomes zero, so the result consists of the entered purchase and setup costs. If those costs are also zero, the Estimated Total Cost is $0.00. The ownership period must still be entered.
Are maintenance and future fuel price changes included?
No. The estimate holds the entered fuel price constant and excludes maintenance, repairs, storage, financing, and resale value. Add your own allowances for those factors when preparing a more complete budget.