Calculators

Estimate the generator starting wattage needed for motor-driven equipment by combining running watts, motor starting surge, quantity, and a safety margin.

Convert generator wattage to current in amps based on voltage, phase, and power factor. Useful for estimating running amperage for portable and standby generators.

Estimate the generator surge wattage needed to start electrical loads by combining total running watts, the largest motor startup multiplier, and safety headroom. Use this to size a generator that can handle startup surges without overloading.

Calculate estimated generator output current in amps based on generator power, voltage, phase, power factor, and efficiency.

Calculate generator output voltage based on power, current, phase type, and power factor. This calculator uses standard electrical relationships for single-phase and three-phase generators.

Calculate estimated three-phase generator real power output from line voltage, line current, power factor, and efficiency. The calculator uses the standard three-phase power relationship and applies efficiency to estimate usable output power.

Calculate the line current of a three-phase generator based on generator apparent power, line-to-line voltage, power factor, and efficiency. Supports input in kVA and returns estimated output current in amperes.

Calculate the output current of a single-phase generator from power, voltage, power factor, and efficiency. Useful for estimating running current based on real-world generator and load conditions.

Calculate recommended generator wattage from voltage, current, phase type, power factor, and surge margin. This helps estimate the generator size needed to safely run electrical loads, including startup headroom.

Calculate estimated generator wattage from electrical current, voltage, phase type, and power factor. This helps size a generator by converting amps to running watts for single-phase or three-phase loads.

Convert generator real power in kilowatts to apparent power in kVA using load power factor and an optional sizing margin for startup and future capacity planning.

Calculate generator load percentage based on generator rated capacity, current electrical load, power factor, and a reserve margin to estimate how heavily the generator is being used.

Convert generator apparent power in kilovolt-amperes (kVA) to real power in kilowatts (kW) using power factor and optional efficiency. This helps estimate usable output power from a generator under different load conditions.

Calculate generator apparent power in kVA from real power, power factor, phase type, voltage, and current. The formula returns apparent power based on either real power and power factor or electrical characteristics combined into one practical estimate.

Calculate generator power factor from real power, line voltage, line current, and phase type. The calculator estimates power factor as the ratio of real power to apparent power using standard single-phase and three-phase electrical formulas.

Estimate the available generator output after temperature derating based on rated capacity, ambient temperature, base temperature rating, derating rate, and site altitude.

Estimate the available generator output at altitude by applying standard power derating for elevation, ambient temperature, and engine aspiration type to a sea-level rated generator.

Estimate the derated generator output based on nameplate rating, altitude, ambient temperature, power factor, and fuel type adjustment.

Estimate generator utilization as the percentage of rated capacity actually used based on average load, generator size, operating hours, and power factor. This helps assess whether a generator is underloaded, properly loaded, or nearing capacity.

Calculate generator load factor as the percentage of average electrical load compared with generator rated capacity, adjusted for operating hours and power factor inputs.

Estimate generator fuel efficiency in kilowatt-hours per gallon based on generator size, electrical load, fuel consumption, fuel type, and generator age condition.

Estimate the installed cost of a natural gas generator based on generator size, equipment quality, installation complexity, fuel connection distance, and whether an automatic transfer switch is included.

Estimate how many days a generator can provide backup power based on fuel available, generator load, generator efficiency, and daily runtime.

Estimate the fuel required for an emergency generator over a planned runtime, adjusted for generator size, average load, fuel type efficiency, and reserve margin.

Estimate the total fuel needed for a generator based on power output, load level, runtime, fuel type efficiency, and reserve margin.

Estimate how many hours a generator can run based on fuel tank size, average load, generator fuel efficiency, and a reserve fuel percentage left unused for safety.

Estimate how many hours a generator can run based on fuel tank size, average electrical load, generator efficiency, and reserve fuel left unused.

Estimate the annual operating cost of a generator based on power output, load factor, runtime, fuel price, and maintenance cost. The calculation combines annual fuel consumption with scheduled maintenance expenses.

Estimate the monthly cost to operate a generator based on power load, runtime, fuel consumption, fuel price, and maintenance allowance.

Estimate the hourly operating cost of a generator based on fuel consumption, fuel price, maintenance cost, and load factor. This calculator helps compare generator runtime costs for different operating conditions.