Wire Harness Design Calculator

Professional engineering tools for custom wire harness design. Calculate AWG size, voltage drop, current capacity, harness cost and connector selection. Designed for industrial equipment, EV, robotics and automation applications.

01. AWG Wire Gauge & Voltage Drop Calculator

Calculate recommended AWG wire size according to current, one‑way cable length and operating voltage. Based on a 3% maximum voltage drop engineering guideline.

Note: This calculator provides engineering reference only. Final wire selection should consider temperature, installation method, insulation rating and safety requirements.

02. Wire Size & Ampacity Selection Calculator

Estimate suitable wire size according to current carrying capacity, installation environment and harness application.

Note: Ampacity result is engineering reference only. Real wire selection must comply with UL758 / ISO6722‑1 standard, consider aging, vibration and derating rules for multi‑wire bundles.

03. Custom Wire Harness Cost Estimator

Estimate harness manufacturing cost based on wire, connector, process, protection and production volume.

Note: Output is estimated unit price in USD for reference only. Final quotation depends on BOM, drawing, material brand and delivery terms.

04. Wire Harness Connector Selection Tool

Recommend suitable connector family based on current, voltage, IP grade and target industry.

Note: Suggestion is for concept reference. Please verify pin count, mechanical lock, vibration resistance and certification before final specification.

AWG Reference Table (Copper Wire)

Reference data for 14‑26 AWG solid copper conductor, used in above voltage‑drop calculator.

AWG Cross‑section (mm²) Resistance (Ω/km)
142.088.45
161.3113.40
180.82321.40
200.51833.90
220.32653.80
240.20586.00
260.129136.00

How to Calculate AWG Wire Size for Wire Harness

AWG wire selection mainly depends on working current, cable length and allowable voltage drop. For most industrial wiring projects, 3% voltage drop is widely adopted as basic engineering threshold.

When designing wiring, you also need to consider insulation grade and working environment. Common general‑purpose hook‑up wire includes UL1007 wire harness. For vehicle application, special rules apply for EV high voltage harness. If your equipment works under wet or dusty conditions, you should choose waterproof connector to guarantee long‑term reliability.

Formula used inside this tool:
Total Resistance = Resistance per meter × one‑way length × 2 (loop for positive & negative)
Voltage drop = Current × Total Resistance

Frequently Asked Questions

What is 3% voltage‑drop rule for wire harness?

The 3% guideline means the voltage loss along the cable should not exceed 3 % of source voltage. It keeps load‑side voltage stable, widely used for low‑voltage industrial and DC harness design.

Why multiply cable length by 2 in AWG calculation?

Current flows out through positive wire and returns through negative wire. Both conductors contribute resistance, so total physical length equals one‑way length × 2.

Can this AWG calculator replace real‑world ampacity tables?

No. This tool only calculates voltage drop. Real‑world current‑carrying capacity also depends on ambient temperature, bundle count, insulation rating and installation method. Always cross‑check with official ampacity tables.

What if no AWG within range meets my voltage‑drop requirement?

You can: use larger‑gauge wire, shorten cable run, raise system operating voltage, or apply parallel multi‑wire conductors.

Does higher AWG number mean thicker wire?

No. In AWG standard, larger number represents thinner conductor. 14 AWG is much thicker than 26 AWG.

Need Custom Wire Harness Solution?

Fill in our contact form to share your requirements, including wire gauge, pin count, length, working voltage, IP rating and assembly drawings. Our engineering team will review and send quotation within 24 working hours.

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