Calculators

Estimate the electricity cost per kWh from a generator using fuel price, fuel consumption, generator load, efficiency, and maintenance cost.

Calculate generator efficiency as the percentage of electrical output power compared with the fuel energy input. Enter electrical power, fuel use, fuel energy content, load factor, and power factor to estimate real-world operating efficiency.

Estimate the monthly value of electricity costs offset by running a generator instead of purchasing all power from the utility, based on load served, runtime, fuel use, and electricity price.

Estimate the annual electrical energy produced by a generator based on rated power, operating hours, average load factor, and overall efficiency.

Estimate the total electrical energy a generator produces in a month based on generator size, average daily runtime, load factor, and generator efficiency.

Estimate how much electrical energy a generator can produce in one day based on generator size, operating hours, average load, fuel efficiency, and power factor.

Estimate total electrical energy output in kilowatt-hours based on generator power rating, load factor, runtime, and alternator efficiency.

Estimate total electrical energy output from a generator based on rated power, load level, runtime, efficiency, and power factor.

Calculate electrical power output from mechanical power input using rotational speed, torque, and system efficiency. Enter either torque and RPM to derive mechanical power, then apply efficiency to estimate electrical output.

Calculate generator electrical efficiency as the percentage of electrical output power compared with the fuel energy input rate. Enter generator output, fuel use, and fuel energy content to estimate operating efficiency.

Estimate the converted generator output when changing between single-phase and three-phase service using voltage, current, power factor, and efficiency. The calculator returns the target phase real power in kilowatts.

Estimate the required generator output circuit current based on generator power, voltage, power factor, phase type, and continuous load sizing. This helps size the output circuit for generator-fed loads using common electrical calculation practices.

Estimate the required three-phase generator size in kVA based on total load, line voltage, power factor, future expansion margin, and motor starting allowance.

Estimate the minimum recommended split-phase generator capacity in watts based on 120/240V load, motor starting surge, and a safety margin.

Estimate the required generator wattage for a 240V load using current, power factor, efficiency, and a startup surge multiplier. Useful for sizing generators for motors, pumps, compressors, welders, and other 240-volt equipment.

Estimate the running wattage needed for a 120-volt generator based on the appliances you plan to power, their quantity, and startup surge requirements.

Estimate generator wattage for a 50 amp electrical service based on voltage, continuous load percentage, power factor, and safety headroom. This calculator helps size a generator for RV, home backup, or jobsite applications by converting amps and volts into recommended running wattage.

Estimate running wattage for a 30 amp generator based on voltage, power factor, and a recommended surge margin for startup loads. This helps determine continuous and practical generator output capacity.

Estimate the available amperage from a generator outlet based on generator running watts, outlet voltage, power factor, and a continuous load safety factor. This helps determine how many amps an outlet can supply for typical sustained use.

Estimate the total electrical load on a generator receptacle by combining running wattage, starting surge, and a continuous-load safety factor. Use this to compare connected equipment demand against a generator receptacle’s practical load level.

Estimate the recommended propane tank size for a generator based on electrical load, generator efficiency, desired runtime, and reserve capacity. The calculation converts expected power draw into propane gallons needed and adds a reserve margin for practical tank sizing.

Estimate the recommended automatic transfer switch size in amperes based on system voltage, phase, load, continuous load factor, and future capacity margin.

Estimate the minimum equipment grounding conductor size for a generator installation based on generator output current, overcurrent protection rating, conductor material, insulation temperature rating, and installation conditions. This calculator provides an estimated grounding wire size in circular mils for comparison and planning.

Calculate estimated voltage drop for a generator cable run based on load current, one-way cable length, system voltage, conductor material, and cable size resistance factor.

Calculate estimated voltage drop for a generator-fed circuit using load current, one-way cable length, conductor size, conductor material, and system voltage. The calculation uses standard resistivity values and returns the voltage drop as a percentage of system voltage.

Estimate the minimum extension cord wire gauge needed for a generator based on running wattage, cord length, supply voltage, and allowable voltage drop.

Estimate the required copper generator cable cross-sectional area based on generator load, system voltage, phase type, cable run length, and allowable voltage drop.

Estimate the minimum copper conductor size needed for a generator feeder based on generator output, voltage, phase, one-way run length, and allowable voltage drop.

Estimate the recommended generator fuse size based on generator power, voltage, phase, power factor, and continuous load margin. The calculation converts generator kW to current and applies a safety margin to help size the fuse.

Calculate a recommended generator output breaker size in amps based on generator capacity, voltage, phase, continuous load factor, and code sizing margin.