Natural Gas Generator Cost Calculator
A natural gas generator can provide backup power when the electricity goes out, but its purchase price is only one part of the budget. Installation, fuel, and maintenance also affect what you spend over time. The Natural Gas Generator Cost Calculator combines these costs into one estimate based on the number of hours you expect the generator to run.
Use the result to compare planning scenarios, prepare for an installation quote, or understand how operating time affects your budget. The default figures are illustrative assumptions, so replace them with information for your generator, gas service, and expected usage whenever possible.
What the Natural Gas Generator Cost Calculator does
The calculator estimates the combined cost of purchasing, installing, and operating a natural gas generator over a selected number of hours. It adds the generator purchase cost and installation cost to an estimate of fuel and maintenance expenses during those operating hours.
The result, labeled Estimated Total Cost, includes the following amounts:
- The generator purchase cost you enter.
- The installation and connection cost you enter.
- The estimated natural gas cost for the selected operating time.
- The estimated maintenance cost for the selected operating time.
Fuel use and the delivered gas rate are assumed to stay constant throughout the selected period. The maintenance figure is an average cost per operating hour. Actual costs can differ as the generator load, gas rate, maintenance needs, and installation requirements change.
How to use the Natural Gas Generator Cost Calculator
Enter your best available figures in the six fields. You can begin with the illustrative defaults and update them as you obtain a generator specification, gas bill, or installation quote.
- Generator purchase cost ($): Enter the amount you expect to pay for the generator itself. If your quoted package includes accessories, check what is already included before entering a separate installation cost.
- Installation and connection cost ($): Enter the expected cost of installing and connecting the generator. This may include electrical work, gas piping, labor, and other items covered by your quote.
- Natural gas consumption at expected load (therms/hour): Enter the generator’s estimated fuel use in therms per hour at the load you expect it to carry. Look for a manufacturer specification that corresponds as closely as possible to that load.
- Delivered natural gas rate ($/therm): Enter the variable price you expect to pay per therm for delivered natural gas. Review your gas bill or utility rate information to identify a suitable rate.
- Total operating time (hours): Enter the total number of hours you want the estimate to cover. This could represent an extended outage, several outages, or another planning period.
- Average maintenance cost ($/operating hour): Enter an assumed average maintenance expense for each hour the generator runs. This spreads maintenance costs across operating hours; it does not mean you will pay for maintenance every hour.
After entering the figures, review the Estimated Total Cost. Try different operating times or fuel-consumption assumptions to see how they affect the estimate. Keep the same purchase and installation assumptions when you want to isolate the effect of runtime.
How the Natural Gas Generator Cost Calculator formula works
The calculator first estimates the cost of fuel for one hour. It then adds the average maintenance cost for one hour and multiplies that combined hourly amount by the total operating time. Finally, it adds the purchase and installation costs.
Estimated Total Cost = Generator purchase cost + Installation and connection cost + Operating hours × [(Fuel consumption in therms/hour × Delivered gas rate in dollars/therm) + Maintenance cost per operating hour]
For example, the default inputs use the following illustrative assumptions:
- Generator purchase cost: $5,000
- Installation and connection cost: $2,000
- Natural gas consumption: 2 therms per hour
- Delivered natural gas rate: $1.50 per therm
- Total operating time: 100 hours
- Average maintenance cost: $0.50 per operating hour
At these assumed figures, fuel costs 2 × $1.50, or $3.00 per hour. Adding $0.50 per hour for maintenance gives an estimated operating cost of $3.50 per hour. Over 100 hours, that is $350 in estimated fuel and maintenance costs.
Adding the $5,000 purchase cost and $2,000 installation cost produces an Estimated Total Cost of $7,350.00. These figures demonstrate the calculation; they are not a quote or a prediction of current prices.
Use cases for the Natural Gas Generator Cost Calculator
Planning a home backup power budget. If you are considering a natural gas generator for outages, combine an equipment price with an installation estimate and a range of possible operating hours. This can help you see how much of the total comes from upfront expenses and how much comes from expected use.
Comparing generator options. Two generators may have different purchase prices and fuel consumption at the load you expect to use. Enter each option’s figures separately and compare the resulting totals over the same number of operating hours. Also consider whether each model can support the equipment you need to power.
Estimating the effect of a longer outage. A short outage and an extended outage can produce very different fuel costs. Run the calculation with several operating-time assumptions to see how the budget changes while keeping the other inputs consistent.
Preparing for installation discussions. An initial estimate can help you identify information to request from a generator dealer, electrician, gas contractor, or utility. For example, you may need a clearer installation quote or a fuel-consumption specification for your expected load.
Other factors to consider when calculating Estimated Total Cost
Generator load affects fuel consumption. The appliances and equipment you run determine how hard the generator works. A consumption figure taken at one load may not represent another. Use a manufacturer’s specification for the expected load, and remember that real-world demand can change during an outage.
Delivered gas rates can vary. The rate entered should reflect the variable cost per therm you expect to pay for delivered gas. Your bill may contain several charges, and the applicable rate can change over time. Fixed gas-service charges are excluded unless you account for them in an entered cost.
Installation costs depend on the property. Gas line work, electrical connections, the generator location, and site preparation can all affect a quote. Check whether your installation and connection cost includes the work and equipment needed for your particular setup.
Maintenance is an average in this calculation. Service expenses may occur at intervals rather than evenly with every hour of use. The calculator uses your hourly maintenance assumption to estimate a share of those costs; actual service needs and expenses can differ.
Some expenses are excluded unless you include them. The estimate does not separately calculate financing, taxes, permits, repairs, or fixed gas-service charges. If appropriate, include known one-time expenses in the purchase or installation amount, taking care not to count the same expense twice. Consider other excluded costs separately when building your full budget.
Operating hours are a planning assumption. Future outages and usage are uncertain. The result reflects the hours entered, rather than a forecast of how long your generator will run.
Frequently asked questions
How much does a natural gas generator cost to run per hour?
The estimated hourly operating cost is the generator’s fuel consumption in therms per hour multiplied by the delivered gas rate per therm, plus the average maintenance cost per operating hour. With the illustrative default inputs, that is $3.00 for fuel plus $0.50 for maintenance, or $3.50 per hour.
Where can I find my generator’s natural gas consumption?
Check the manufacturer’s specifications for your model and look for fuel consumption at your expected load. The calculator requires therms per hour, so make sure the specification uses that unit or convert it before entering the value.
Does the calculator include installation?
Yes. It adds the amount entered in the Installation and connection cost field to the generator purchase cost and estimated operating costs. The result is only as complete as the amount you enter, so check which items your installation quote covers.
What happens if I enter zero operating hours?
The operating portion of the formula becomes zero, leaving the entered purchase and installation costs. For example, the illustrative $5,000 purchase cost and $2,000 installation cost produce an estimated total of $7,000.00 at zero operating hours.
Can I use the result as a final installation quote?
No. The calculator provides a planning estimate based on your inputs and assumptions. A final budget may also need to account for permits, taxes, repairs, fixed gas-service charges, financing, or other expenses not separately calculated here. Obtain quotes and review the details for your property before making a purchase decision.