Calculators

Estimate the total installed generator capacity required to support a critical load with a chosen redundancy standard, reserve margin, and generator derating factor.

Calculate generator alternator efficiency based on electrical output power and mechanical input power, with optional adjustment for power factor when deriving real output from apparent power.

Estimate the total usable capacity of generators operating in parallel, adjusted for load sharing efficiency, power factor, and a reserve margin for reliable operation.

Estimate the total usable power output when running multiple generators in parallel, accounting for each generator’s rated capacity, quantity, derating for environmental/load conditions, and synchronization efficiency.

Estimate the sound level from a generator at a different distance using the inverse square law for sound propagation. Enter the generator’s rated noise level, the reference measurement distance, the new distance, and optional environment and barrier adjustments.

Estimate sound level at a given distance from a generator using the inverse square law, with optional environment and barrier adjustments. Enter the generator’s rated noise level at a reference distance, then adjust for your actual listening distance and site conditions.

Estimate carbon dioxide emissions from a natural gas generator based on generator size, load level, operating time, and fuel energy content. The calculation approximates electrical output adjusted by load and converts energy use to CO2 using a natural gas emission factor.

Estimate carbon dioxide emissions from a propane generator based on power output, load, runtime, and generator efficiency. The calculation uses an estimated propane consumption rate derived from generator size and load, then converts fuel use to CO2 emissions.

Estimate carbon dioxide emissions from a diesel generator based on generator load, operating hours, fuel consumption rate, and diesel emission factor.

Estimate carbon dioxide emissions from operating a generator based on power output, runtime, load factor, fuel type, and generator efficiency. The calculation estimates fuel use from electrical output and converts it to CO2 emissions using typical fuel-specific emission factors.

Estimate generator engine speed in RPM based on electrical frequency, alternator pole count, pulley ratio, and slip percentage. Useful for checking target engine RPM for 50 Hz or 60 Hz generator setups.

Estimate the engine oil capacity for a generator based on engine displacement, cylinder count, cooling type, and engine age. This calculator provides an approximate oil fill capacity useful for maintenance planning, but always confirm the exact specification in the generator or engine manual before adding oil.

Calculate generator shaft torque from power, rotational speed, efficiency, and operating condition factor. Useful for estimating the mechanical torque required to drive or produced by a generator under real-world conditions.

Convert generator power from kilowatts to horsepower with optional adjustments for generator efficiency and load factor to estimate equivalent engine horsepower required.

Convert generator horsepower to kilowatts and estimate usable electrical output based on generator efficiency and power factor.

Estimate generator engine displacement from electrical output, generator efficiency, engine speed, and engine type. This calculator approximates the engine size in cubic centimeters needed to deliver the required mechanical power.

Estimate the labor hours needed for generator service based on generator size, service level, age, and site accessibility.

Estimate the recommended maintenance interval for a generator in operating hours based on generator type, average load, environment, and generator age.

Estimate the recommended number of operating hours between generator oil changes based on oil type, engine age, average load, and operating environment.

Estimate generator engine oil consumption over a period based on generator size, operating load, runtime, and oil consumption rate.

Estimate the return on investment for purchasing a generator based on equipment cost, outage frequency, outage duration, business loss avoided per hour, and annual maintenance cost.

Estimate the electricity cost per kWh from a diesel generator based on diesel price, generator fuel consumption, loading efficiency, maintenance cost, and generator size class.

Estimate the electricity generation cost per kWh for a natural gas generator using fuel price, generator efficiency, maintenance cost, capacity factor, and generator size adjustment.

Estimate the electricity cost per kilowatt-hour from a propane generator based on propane price, generator load, fuel consumption, and maintenance cost.

Estimate how many years it takes for a backup generator investment to pay for itself based on purchase cost, outage frequency, outage duration, value of avoided losses, and annual operating costs.

Compare the estimated total cost of renting a generator versus buying one based on power size, usage duration, rental rate, purchase price, and maintenance costs.

Estimate the total cost to rent a generator based on power size, rental duration, fuel usage, delivery distance, and generator type.

Estimate the total cost to install a standby generator based on generator size, fuel type, installation complexity, transfer switch rating, and distance from the fuel/electrical connection point.

Estimate the installed cost of a residential standby generator using generator size, fuel type, installation complexity, transfer switch type, and distance from the fuel/electrical connection point.

Estimate the annual generator maintenance cost based on generator size, service frequency, age, fuel type, and usage intensity.