# How to Estimate Composite Part Cost: Layup Labor, Material, and Cure > Source: https://netray.co/resources/composite-part-cost-estimating-layup-labor-and-material > Publisher: Netray (netray.co), AI and integration engineering for ERP and manufacturing systems. > Section: Knowledge Base ## Short answer How to estimate composite part cost: ply count, layup minutes per ply, material waste, bagging, cure and trim, and how to check estimates against actual hours. ## Category ai-automation ## Content **Intro:** To estimate a composite part cost, build it from the ply schedule: material area per ply times a nesting waste factor, layup minutes per ply by ply size and complexity, then bagging, cure, demold, trim, inspection and tooling charges. Most shops lose margin not on material price but on layup labor, because hand layup time varies far more than the quote assumes. This guide walks through the cost build that works for prepreg, wet layup and infusion parts, shows where estimates drift from actuals, and explains how to keep your own history honest. **Sections:** #### Start From the Ply Schedule, Not the Part Weight **Body:** Pricing by finished weight or by square foot of surface works for commodity FRP panels, but it fails on engineered parts. The reliable starting point is the laminate schedule or ply book: each ply with its material, orientation, size and location. From it you get net area per ply, total ply count and the number of distinct materials (each one is a separate freezer or storage item). Core, adhesive film, peel ply, breather and bagging film are costed as consumables per bag area. If the customer gives only a CAD model and a callout like quasi-isotropic 12 ply, ask for the ply book before quoting, or state your ply assumption on the quote so a later change is a priced change. **Bullets:** - Net area per ply from the flat pattern, not the 3D surface - Material form: unidirectional tape, woven fabric, mat, roving or core - Local reinforcements, doublers and ply drops add cutting and layup time - Consumables scale with bag area, not with part weight #### Material Cost With Real Waste Factors **Body:** Gross material is net ply area divided by nesting yield. Yield depends on roll width, ply shape, fiber direction constraints and how many parts you nest on a cut. Simple rectangular plies on a 60 inch roll can yield 85 to 92 percent, while curved plies with 0, 45 and 90 degree restrictions often land between 55 and 75 percent. Prepreg adds a second loss: material that passes its out-time limit before use becomes scrap, and expensive carbon prepreg makes that visible. Add a scrap allowance for layup errors, a separate allowance for edge trim, and the cost of cut kits that go back to the freezer or are discarded. Quote prepreg by the pound or square yard as billed by the supplier, including freezer storage and any minimum roll charges. #### Layup Labor: Minutes per Ply Beat Hours per Part **Body:** Hand layup labor is best estimated as minutes per ply, adjusted for ply size, drape difficulty and tool geometry. A flat 12 by 12 inch ply on a simple tool might take two to four minutes including debulk handling, while a large contoured ply with darts and a tight radius can take ten times longer. Track separately: kit pickup and tool prep, ply placement, intermediate debulks (often every few plies on thick laminates), core placement, bagging and leak check, and demold. Estimators who use a single hours per part number cannot learn from a miss, because they cannot tell whether layup, bagging or trim was the problem. **Bullets:** - Tool prep and release agent application are fixed per cycle - Debulk frequency depends on laminate thickness and resin system - Bagging and leak check time grows with bag perimeter and complexity - Learning curve matters on the first 5 to 10 parts of a new program #### Cure, Trim, Inspection and Tooling **Body:** Cure cost is oven or autoclave time multiplied by a loaded hourly rate, shared across every part on that load. An autoclave cycle of 6 to 10 hours may carry one large part or thirty small ones, so the cost per part depends entirely on your load plan. After cure come demold, trim and drill (water jet, router or hand), cleaning, and inspection such as visual, tap test or ultrasonic NDI where required. Add outside processing for painting, bonding, potting inserts or machining of metal fittings. Tooling is its own line: amortize it across the committed quantity, or charge it as non-recurring cost when the customer owns the tool. Always show recurring and non-recurring cost separately so a quantity change reprices cleanly. #### Closing the Loop With Actual Hours **Body:** An estimating method is only as good as the feedback behind it. After each job, compare estimated and actual hours by operation, not just in total. Layup, bag, cure, trim and inspection should each have their own variance, and material should compare actual cut yield with the quoted yield. Most ERP systems can report this if work orders are costed by operation and labor is posted per operation; the usual failure is that operators clock on at the job level. Once the history is clean, a similar-job lookup becomes the best estimating tool you have. If you build very few parts a year, or each is truly one-off research hardware, a disciplined spreadsheet is a reasonable tool and heavier systems are not worth it. **Cta:** If your history sits in an ERP and a folder of past quotes, Netray can build a private lookup that finds similar parts and shows estimated versus actual hours before the estimator commits a number. **Faq:** #### How do you calculate the cost of a carbon fiber part? **Answer:** Add material (net ply area divided by nesting yield, priced per pound or square yard), consumables per bag area, layup and bagging labor from minutes per ply, a share of the oven or autoclave cycle, trim and inspection labor, outside processing, and tooling amortization. Then add overhead and margin. The ply book drives almost every number, so get it before quoting. #### What is a normal waste factor for prepreg? **Answer:** It varies widely with part shape and fiber orientation limits. Simple shapes can nest at 85 to 92 percent yield, complex contoured plies often 55 to 75 percent. Add separate allowances for out-time expiry and layup scrap. Use your own cut-kit history rather than a handbook number whenever you have it. #### How long does hand layup take per ply? **Answer:** A small flat ply may take two to four minutes, while a large contoured ply with darts can take 20 minutes or more. Estimate by ply size and drape difficulty, and measure real times on the first parts of a new program, because the learning curve is steep early on. ## Related Slugs - syteline-job-costing-configuration-guide - syteline-cost-variance-analysis-setup - how-to-fix-syteline-cost-rollup-variances - ai-quoting-aerospace-defense-manufacturers ## Search terms composite part cost estimating, layup labor cost estimate, how to estimate carbon fiber part cost, prepreg material waste factor, composite manufacturing cost model, ply book cost estimate, composites quoting --- Talk to an engineer: https://netray.co/contact?intent=erp_ai | Machine catalog: https://netray.co/agent/catalog.json