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Battery Bank Size Calculator
Off-grid battery bank from daily use, autonomy, and discharge depth.
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Electrical Calculators
Thirty-three electrical calculators for load, circuits, rates, commercial power, solar, EV, raceway, and lighting. Visible formulas, screening-grade math.
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Generator Size Calculator
Generator watts from running load plus the largest motor start.
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Lighting Level Calculator
Average footcandles from fixtures, lumens, and room area.
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Electrical Box Fill Calculator
NEC 314.16 box fill from conductor count, devices, and box volume.
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Cable Pulling Tension Estimator
Straight-run pulling tension and sidewall pressure screening.
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Wire Ampacity Calculator
NEC 310.16 copper ampacity from wire size.
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Panel and Service Size Estimator
NEC 220 style demand estimate for residential services.
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Motor Full-Load Current Estimator
Estimate three-phase motor current from HP, efficiency, and PF.
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Transformer Sizing Calculator
Full-load current for single- and three-phase transformers.
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Fault Current Calculator
Infinite-bus available fault current at transformer secondaries.
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Conduit Bending Calculator
Offset travel, run, and multiplier for common bend angles.
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Voltage Drop Calculator
Price voltage drop for single- and three-phase runs.
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