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Battery Capacity Converter (Ah, Wh, kWh)
Convert amp-hours to watt-hours or kilowatt-hours and back at any nominal voltage, with the amp-hours per kWh factor.
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Battery storage calculators
Battery sizing, backup runtime, payback, plus solar, rates, circuits, and load, each with visible math.
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Battery Backup Runtime Calculator
Backup runtime from usable energy, inverter efficiency, standby draw, and the load, plus the load the bank can sustain for a target outage length.
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Solar Battery Size Calculator
Size a battery bank from daily energy, autonomy days, depth of discharge, inverter losses, and peak load.
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Battery Bank Size Calculator
Size a battery bank in kWh and Ah and get the series/parallel wiring layout and unit count.
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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 and lux 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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