Harness Costing

Wire Harness Cost Estimation: Building a Quote That Holds Up

A cost breakdown for harness quoting: material versus labor split, connector and terminal spend, scrap loss, overhead, and the estimate errors that erode margin.

On most wire harnesses, material and labor split roughly 55 to 45, but that ratio swings hard by product. A power distribution harness heavy on large-gauge wire and sealed connectors can run 70 percent material, while a signal harness with dozens of tiny crimps and hand routing flips to 60 percent labor. Quote the two buckets separately, because they scale differently: material tracks bill-of-material count and copper price, labor tracks operation count and volume. The Wire Harness Cost calculator keeps these buckets visible so a copper spike or a labor rate change is traceable rather than absorbed into a single fuzzy piece price.

Connectors and terminals are where estimators lose money quietly. Terminals look cheap at 3 to 12 cents each, but a 74-crimp harness carries 74 of them, so 8 cents each is nearly 6 dollars before a single connector. Connector housings and sealed backshells run 0.40 to 6 dollars each, and a harness with 8 connectors can carry 15 to 30 dollars in housings alone. Price these from the actual part list using the Terminal Cost and Connector Cost calculators, never as a lumped percentage, because a design change adding one 12-position sealed connector can move piece cost by 4 dollars overnight.

Labor cost is standard minutes times loaded rate, and both halves get fudged. A fully loaded assembly rate of 28 to 42 dollars per hour is realistic in North America once benefits, supervision, and facility burden are in; offshore lines run 6 to 14 dollars. At 32 dollars per hour, the 30-minute build from a mid-complexity harness is 16 dollars of labor. Use the Cable Assembly Labor and Crimp Labor Load calculators to get standard minutes from operation counts rather than a gut estimate, since a 5-minute error per unit is 2.67 dollars, and across 5,000 units that is more than 13,000 dollars of margin.

Scrap is a real cost line, not a rounding error, and it hides in three places: wire lead-end waste, mis-crimps, and rejected assemblies. Cut-and-strip scrap of 3 to 6 percent on wire, a crimp reject rate near 0.5 to 2 percent, and a first-pass assembly yield of 92 to 97 percent stack up. If wire and terminal material is 22 dollars and combined scrap effectively adds 6 percent, that is 1.32 dollars per unit you must recover in the quote. The Cable Scrap Cost calculator converts these loss fractions into dollars so you price the copper you buy, not just the copper you ship.

Test time is often left out of quotes entirely, which is a mistake on any harness with a spec. Fixtured continuity and hipot on a bed-of-nails tester adds 10 to 30 seconds of cycle plus fixture amortization, but manual point-to-point on a 45-net harness can add 4 to 6 minutes, which at 32 dollars per hour is 2.13 to 3.20 dollars per unit. Amortize custom test fixtures too: a 4,500-dollar fixture over a 5,000-unit program is 0.90 dollars per unit. The Harness Test Time and Continuity Test Workload calculators give the cycle basis for this line.

Overhead and margin are the last layers, and stacking them wrong either loses the bid or loses money. Apply overhead as a percentage of the labor-plus-material subtotal, commonly 12 to 25 percent for a contract manufacturer, then add target margin of 15 to 35 percent on top of full cost, not on cost of goods alone. On a harness with 22 dollars material, 16 dollars labor, and 1.32 dollars scrap, a 20 percent overhead adds about 7.86 dollars, and a 25 percent margin on the 47.18 subtotal adds 11.80, landing near 59 dollars. Setup and NRE for cut programs and fixtures amortize separately over run size.

The most common quoting error is estimating from a similar past harness instead of the actual bill of materials, which silently misses added connectors, gauge changes, and new test requirements. The second is quoting a prototype rate on production volume: a 50-unit build might run 45 minutes of labor while the 5,000-unit build with fixtures and cut automation runs 22, and quoting the wrong one either prices you out or buries your margin. Rebuild the quote from part counts and operation counts at the real volume, and let the Wire Harness Cost calculator carry the arithmetic so the assumptions stay visible for the next revision.

Published 2026-07-01.