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Generator Sizing Calculator
Running load plus the largest motor start, a growth margin, and the duty rating you actually need, expressed in kW and kVA.
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Generator calculators
Load lists, sizing, fuel and runtime, installation budget, running cost, and maintenance, each with visible math.
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Duty Cycle & Diversity Estimator
Diversify connected load with real duty cycles instead of assuming everything runs at once.
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Non-Linear Load & Alternator Derating
Harmonic currents heat alternator windings. Turn a non-linear load share into the kVA a set really has to carry.
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Generator Derating: Altitude & Temperature
Altitude and ambient temperature reduce every rating. Convert your site conditions into usable kW and the nameplate you must order.
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24-Hour Load Profile Simulator
Build a day of backup load from base, daytime, and evening blocks to get daily kWh, peak kW, and load factor.
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Existing Load from Demand Data
NEC 220.87: turn a recorded peak demand into an allowable calculated load and see how much service headroom is left.
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Dwelling Service Load Calculator
NEC standard method versus the 220.82 optional method on the same house, plus the service size and generator kW each implies.
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Backup Load Priority Planner
Split the backup list into must-run, important, and optional tiers, then size the set for each tier.
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kW / kVA / Amps Converter
Convert generator kW to kVA, amps, horsepower, and BTU per hour at a stated power factor and voltage.
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Whole-House Backup Load Calculator
Dwelling demand the NEC 220.82 optional method way, then the generator kW that covers it with and without load management.
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