Free Engineering Tools
Wire Harness Engineering Calculators
Professional engineering calculators for wire harness design, cable sizing, and electrical calculations. Free tools used by engineers worldwide.
Quick Summary
A wire harness is a routed bundle of many conductors and terminations, while a cable assembly refers to one or more finished cables used for a direct interconnect. These tools help engineers move between conductor sizing, AWG conversion, and voltage-drop checks before they freeze routing, connector, and test decisions.
Calculators
Choose a calculator
Wire size, voltage drop, and AWG conversion are linked decisions — open the tool that matches the check you need.
AWG to mm² Converter
Convert between American Wire Gauge (AWG) and metric cross-sectional area (mm²). Get wire diameter and resistance data instantly.
- Bidirectional AWG ↔ mm² conversion
- Wire diameter calculation
- Resistance per kilometer
- Supports AWG 0-30
Voltage Drop Calculator
Calculate voltage drop across wire harness and cable assemblies. Ensure your wire size meets electrical requirements.
- Calculate voltage drop in volts
- Percentage drop calculation
- 3% threshold warnings
- Support for various wire sizes
Wire Size Calculator
Determine the minimum wire size needed for your application based on current, length, voltage, and acceptable voltage drop.
- Calculate minimum wire size
- AWG size recommendations
- Customizable voltage drop limits
- Current and length based
Why Use Our Calculators?
Fast, standards-based checks
Industry-standard calculations based on ASTM, NEC, and IEEE standards.
Instant Results
Get accurate calculations in real-time without complex formulas or spreadsheets.
Industry Standards
Based on ASTM B258, NEC voltage drop guidelines, and copper resistivity standards.
100% Free
No registration, no hidden fees. Professional engineering tools available to everyone.
Calculator Comparison Table
| Tool | Primary Output | Best Use |
|---|---|---|
| AWG to mm² Converter | Equivalent size, diameter, resistance | Translate BOM and drawing units |
| Voltage Drop Calculator | Voltage loss and percentage | Check branch performance under load |
| Wire Size Calculator | Minimum copper area and AWG guidance | Select conductor size early in design |
References
Authoritative References
FAQ
Frequently Asked Questions
Who are these calculators for?
They are for design engineers, sourcing teams, and manufacturing reviewers who need quick checks before issuing drawings or requesting quotes.
Do the tools replace formal engineering review?
No. They are screening tools that support quoting and design iteration before full validation, standards review, and production release.
Why group these calculators together?
Wire size, voltage drop, and AWG conversion are linked decisions, so engineers often move between them during the same harness review.
Can I use the results for cable assemblies as well as harnesses?
Yes. The math applies to both, although branch complexity and packaging constraints are usually higher in a wire harness.
What should I do after using a calculator?
Confirm the result against insulation, temperature, connector, and testing requirements before releasing the final BOM or drawing package.
Get the Cable Built
Beyond Calculators — Get the Cable Built
Once you’ve sized the conductor, we manufacture the assembly. Top cable-assembly programs paired with our engineering tools:
Need Professional Wire Harness Production?
Our engineering team can help you design and manufacture custom wire harnesses that meet your exact specifications.