Ductwork Labor & Cost Calculator
Calculate Ductwork labor and material cost, built on real Wendes estimating data.
Ductwork labor & cost calculator
Fabricating includes shop labor plus field labor.
Estimate excludes waste, hangers and connection materials. For the full report, try the WenDuct demo.
This covers straight duct and 90° elbows for one gauge. WenDuct runs a full takeoff across every fitting, gauge and connection.
How this is calculated Explore WenDuctHow to use our free ductwork labor calculator
How to use our ductwork labor calculator
- Pick fabricating and installing, or installing only.
- Enter your straight duct sizes and 90 elbow counts. Stretchout auto-fills.
- Add your metal price per pound for straight and fittings.
- Enter your burdened shop and field labor rates.
- Press Calculate for hours and total cost.
Interpreting Your Results
The results show four figures: fabrication hours, installation hours, total labor cost, and total project cost, along with a breakdown of straight material, fitting material, and labor. When you select installing only, the fabrication hours drop to zero and shop labor is excluded, since you are not building the duct yourself.
These numbers are a guideline estimate, not a finished bid. A full takeoff also accounts for waste factors, hangers and supports, seams and connections, and multiple gauges across a system. For a complete, itemized estimate, run your project through the WenDuct demo.
How Ductwork Labor and Material Are Calculated
There are three widely accepted methods for calculating ductwork labor: the hours per piece method, the hours per pound method, and the square feet per hour method used for specialty duct like PVC, FRP, fiberglass, and flex. This calculator uses labor values drawn from production labor studies, applied per foot for straight duct and per piece for fittings.
Labor. Each duct type and size carries a predetermined fabrication and installation labor value, indexed by stretchout (the flattened perimeter of the duct expressed in feet). A 24 by 12 duct, for example, has a stretchout of 6 feet. The calculator looks up the matching labor row and multiplies it by your footage for straight duct, or by your piece count for elbows.
Material. Material cost starts from surface area. Straight duct square footage is the stretchout in feet multiplied by the run length. A fitting’s square footage is derived from its stretchout and developed length. That square footage is converted to weight using the pounds per square foot for the gauge (0.906 for 26 gauge), then multiplied by your price per pound.
Together these give a labor and material figure you can cross check against your own historical numbers, which is exactly how experienced estimators validate a rate before trusting it.
Fabricating vs. Installing Ductwork Only
The calculator distinguishes between two situations, because they carry different labor.
Fabricating and installing. When your shop builds the duct and your crew hangs it, you incur both shop (fabrication) labor and field (installation) labor. Material is priced at your raw metal cost per pound, since you are buying coil and sheet rather than finished duct.
Installing only. When you buy duct pre-made and only hang it in the field, you incur installation labor alone. Fabrication hours and shop labor are excluded from the total.
Choosing the right mode matters, because fabrication can represent a substantial share of total labor on a rectangular duct job. Estimating both when you only install, or omitting shop time when you actually fabricate, is one of the most common ways a ductwork bid drifts off target.
Why Estimators Use Our Dedicated HVAC Software
A calculator like this one is useful for a single duct type at a single gauge. Real projects rarely stay that simple. A full mechanical takeoff spans dozens of fitting types, multiple gauges and materials, hangers and supports, seam and connection labor, and waste factors that shift with each shop’s practices.
WenDuct automates that entire process. It performs on-screen takeoff directly from digital plans, applies your own labor and material tables across every piece, and produces an itemized report with extensions and a project summary. Estimators move from hours of manual measuring and lookup to a complete, defensible bid in a fraction of the time.
If you estimate ductwork regularly, schedule a free demonstration to see a full takeoff run on your own drawings.
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