Free Wire Harness Tools

Professional calculators for electrical engineers. No signup required.

Start With High-Impact Tasks

These are the engineering checks that tend to make or break a harness release.

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Voltage Drop Calculator

Check long runs, low-voltage circuits, and recommended wire gauge before release.

Bundle Diameter Calculator

Size conduit, backshells, and packaging around the real bundle OD.

Connector Pinout Library

Resolve connector details quickly with printable pin and signal references.

MIL-Spec Part Decoder

Decode connector part numbers before they become BOM or sourcing errors.

Mil-Spec Part Decoder

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Decode military connector part numbers. Instant breakdown of D38999, MIL-DTL-5015, 26482, Micro-D, Nano-D, D-Sub, M12, and ARINC 600 codes.

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Connector Pinout Library

Interactive pinout diagrams for RJ45, USB-C, DB9, OBD-II, M12, and more. Hover to see signal details, print for shop floor reference.

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Wire Color Code Chart

Interactive reference for SAE J1128, IEC 60757, and MIL-STD-681 wire color standards. Includes visual swatches and usage guides.

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Bundle Diameter Calculator

Calculate wire bundle diameter for conduit sizing. Input wire gauges and quantities to get precise bundle dimensions.

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Voltage Drop Calculator

Calculate voltage drop, power loss, and recommended wire gauge. Supports DC, AC, and 3-phase with temperature correction.

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AWG to Metric Converter

Convert between AWG and mm² wire sizes. Complete reference table with diameter, resistance, and ampacity.

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Wire Weight Calculator

Estimate wire bundle weight per meter/foot for harness design and logistics planning.

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Need Complete Wire Harness Design?

WireIt automates BOM generation, cutlists, and production exports. Compare the buyer-focused wire harness software overview for the full harness workflow and evaluation criteria. .

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