Most searched · 33,100 / mo

Voltage Drop

NEC + AS/NZS 3008 · DC · 1-phase · 3-phase

Verified circular-mil and ohms-per-1000-ft formulas. Solves percent drop, end voltage, and required wire size in one pass — with the section of the standard cited in every output.

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Polyphase analysis

Three-Phase Power

Y · Δ · per-phase · power factor

Real, reactive, and apparent power from line voltage and current. Wye–Delta conversions, unbalanced loads, and motor branch sizing — fully derived, not hand-wavy.

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Structural · 27,100 / mo

Moment of Inertia

I · circle · rectangle · composite · AISC sections

Section properties from W-shape, HSS, IPE, and HEA tables — plus parallel-axis transfer for any custom composite. Drawing-grade accuracy for shop drawings and submittals.

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Fault analysis · 8,100 / mo

Short-Circuit Current

Point-to-point · asymmetrical fault · DC offset

Bolted three-phase fault current at any node. Includes motor contribution, X/R ratio asymmetry, and the DC decay envelope every protective-device coordination study needs.

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