Free HVAC Takeoff Software for Contractors

Yes. Easy Takeoffs is the only genuinely free HVAC takeoff tool with no trial period, no credit card, and no feature limits. You get full access to the polyline tool for tracing duct runs, the count tool for registers and equipment, measurement grouping by system, and CSV export for fabrication orders. Most HVAC estimating software requires expensive subscriptions. PlanSwift charges around $1,749 per year. STACK starts at $2,599 per year. FastDUCT, FastPIPE, and other mechanical-specific tools run $2,000 to $5,000 annually. Trimble MEP runs well over $5,000. Easy Takeoffs handles the measurement and counting phase of HVAC estimating at zero cost. You bring the quantities into your own pricing workflow. The tool works in any browser, so your office desktop, a tablet in the mechanical room, and your laptop at home all access the same projects without installing software.

Start by uploading the full mechanical plan set as a PDF. Navigate to the supply air plan and set the drawing scale using a known dimension or the printed scale bar. Most mechanical plans are drawn at 1/4-inch equals 1 foot or 1/8-inch equals 1 foot. Begin with the supply air system: trace the main supply trunk from the air handler or RTU using the polyline tool, clicking at every branch takeoff, transition, and direction change. Then trace each branch duct to the register or diffuser. Create a "Supply Duct" measurement group for these traces. Switch to the return air plan and trace the return system in a separate group. Then do the same for exhaust ductwork. Use the count tool to mark every supply register, return grille, diffuser, fire damper, VAV box, and piece of equipment. Create separate count groups for each device type. Finally, trace refrigerant line sets between outdoor and indoor units if the project has split systems. Export everything to CSV and your quantities are organized by system and ready for the sheet metal fabrication order and bid pricing.

Waste factors vary by duct type. Sheet metal duct (galvanized spiral and rectangular) runs 8 to 12 percent waste. The waste comes from fabrication cutoffs at transitions, reducers, end caps, and field modifications. Rectangular duct wastes more than spiral because every fitting is custom-fabricated from flat sheet, generating irregular offcuts. Flex duct runs 3 to 7 percent because it bends without fittings, but the short runout lengths (typically 6 to 12 feet) from 25-foot boxes mean each box leaves a remnant. Duct board runs 10 to 15 percent because scoring and folding creates scrap at every corner, fitting, and transition. External duct insulation (fiberglass wrap) runs 8 to 12 percent due to the extra material consumed wrapping around elbows, tees, and fittings versus straight runs. Refrigerant line sets run 3 to 7 percent. Pre-charged sets come in fixed lengths, and the difference between the run measurement and the next available set length is waste. Apply waste factors per material type, not as a single blanket percentage across the project.

HVAC plan symbols for supply registers are typically rectangles with diagonal lines (indicating airflow direction), return grilles are rectangles with parallel lines, and diffusers are circles or squares with radial lines. Some engineers use custom symbols defined in the drawing legend. Check the legend before starting your count. In Easy Takeoffs, create a separate count group for each device type: supply ceiling registers, supply sidewall registers, return ceiling grilles, return wall grilles, linear slot diffusers, and any specialty items. Click on each symbol on the plan and the count updates in real time. After counting each floor, cross-reference your total against the mechanical schedule in the specifications. The schedule lists every terminal device by type, size, CFM rating, and quantity. If your plan count does not match the schedule, submit an RFI before bidding. Common miscount sources: registers hidden behind door swings on the plan, return grilles in hallway ceilings that blend into the architectural drawing, and transfer grilles in walls between rooms that are drawn differently than ceiling devices.

An HVAC takeoff measures the quantity of ductwork, equipment, and accessories from the mechanical drawings. A Manual D calculation is the engineering process that determines what duct sizes should be used based on airflow requirements, friction rate, and equivalent duct length. The takeoff tells you how much material to order. Manual D tells you what sizes to use. On most commercial projects, the mechanical engineer performs Manual D during design, and the duct sizes are noted on the drawings. Your takeoff simply measures the footage at the sizes shown. On residential new construction, the HVAC contractor often performs both Manual D (to size the duct system) and the takeoff (to quantify material for ordering). The Manual D calculation requires a Manual J load calculation first, which determines the CFM airflow needed for each room. Manual D then sizes the ducts to deliver that airflow within an acceptable friction rate (typically 0.08 to 0.10 inches of water column per 100 feet). The takeoff is downstream of Manual D. You cannot do an accurate takeoff until you know the duct sizes, either from the engineer drawings or your own Manual D.

Yes. Commercial mechanical plan sets are typically multi-page PDFs with separate sheets for each floor, each system (supply, return, exhaust, kitchen hood), equipment schedules, control diagrams, and duct riser details. Upload the entire set as a single PDF and navigate between pages within the project. Commercial HVAC takeoffs require more measurement groups than residential because the systems are more complex. A typical commercial takeoff might have 15 to 25 groups: floor 1 supply duct, floor 1 return duct, floor 1 exhaust, and so on for each floor, plus separate groups for kitchen hood ductwork, laboratory exhaust, stairwell pressurization, parking garage ventilation, and refrigerant piping. The count tool handles the higher device densities on commercial floors. A single commercial floor might have 40 to 80 terminal devices across supply, return, and exhaust systems, plus VAV boxes, fire dampers, and smoke dampers. Create separate count groups for each device type and export to CSV so your estimator can price duct material, equipment, and accessories as separate bid line items.

Refrigerant line sets connect outdoor condensing units to indoor evaporator coils on split systems, mini-splits, and VRF systems. Use the polyline tool to trace the routing path from the outdoor unit to each indoor unit. Start at the outdoor unit and follow the anticipated path: along the building exterior, through penetrations, across ceilings or in pipe chases, and to each indoor unit. The routing is rarely a straight line. Create separate measurement groups for each refrigerant circuit. A 4-zone mini-split has 4 separate line sets, each with a suction line and a liquid line. On VRF systems, also trace the branch piping from the Y-joints to each indoor head. The branch pipes are typically smaller diameter than the main header. Note the pipe diameter for each group because 3/8-inch liquid line costs differently than 7/8-inch suction line. Total footage determines refrigerant charge calculations and whether the system falls within the manufacturer maximum equivalent piping length. Pre-charged line sets come in fixed lengths (25, 35, 50 feet), so your measured footage determines which set to order and the waste from the length difference.

Digital HVAC takeoff from properly scaled PDFs is consistently more accurate than manual scaling on paper. Manual takeoffs introduce error from ruler placement, scale reading, and transcription. A 1/16-inch misread at 1/4-inch scale equals 3 inches in the real world. Over 30 duct runs, those errors compound to 5 to 10 percent variance from actual installed footage. Digital tracing eliminates parallax and reading errors because the software calculates footage directly from the calibrated scale. Digital takeoffs typically land within 2 to 3 percent of installed measurements. The bigger accuracy gain is completeness. Manual takeoffs miss duct runs because the estimator skips a section of a dense drawing, loses track of which branches have been measured, or forgets an entire page of the plan set. Digital markers on the plan make omissions visible because unmarked duct runs stand out against the measured ones. Accuracy also depends on drawing quality. If the engineer drew duct routing to scale, the digital trace is accurate. If the routing is schematic (showing connections but not actual paths), add routing allowances for the real-world path.

A complete HVAC takeoff requires the mechanical plan sheets (M-series drawings), which show duct routing, terminal device locations, equipment placement, and pipe routing on each floor. These are your primary measurement sheets. You also need the mechanical schedules, usually on the first or last mechanical sheet, which list every piece of equipment and every terminal device with tag numbers, manufacturers, models, capacities, and quantities. Beyond the M-series, the architectural floor plans provide room dimensions and ceiling heights needed for duct drop calculations and duct board plenum sizing. Structural plans show beam locations, bar joist directions, and slab penetrations that affect duct routing. The project specifications (Division 23) define materials, insulation requirements, testing procedures, and acceptable manufacturers. For commercial projects, you may also need the controls drawings for thermostat counts and control valve quantities, and the fire protection drawings for coordination around sprinkler mains. Upload all relevant pages into the same Easy Takeoffs project and switch between them while building your takeoff. Having the architectural plans alongside the mechanical plans lets you verify ceiling heights and coordinate routing clearances.

Duct size changes at every transition, reducer, and branch takeoff along the system. The mechanical drawings note the size at each change point. You have two approaches for tracking sizes. The first is to create a separate measurement group for each duct size: "12-inch round supply," "10x8 rectangular supply," "6-inch round supply runout." This gives exact footage per size for fabrication ordering but creates many groups on a large project. The second approach is to trace each system as a continuous run in one group and note duct sizes in the group name or description. The CSV export gives total footage per group, and you annotate sizes manually on the fabrication order. Most experienced estimators use the first approach for the main trunk sizes and the second for smaller branches, since the shop needs exact trunk footage by size but can work with approximate branch totals. For flex duct runouts, a single group usually works because most runouts on a residential system are the same diameter (6-inch or 8-inch). On commercial systems where runout sizes vary by zone, separate groups by size.

A residential HVAC takeoff for a 2,500 square foot single-family home with a single-zone system takes 20 to 40 minutes with digital takeoff software. The supply trunk, branches, and 10 to 15 runouts trace quickly. Add 15 minutes for the return system and equipment counts. The same job takes 2 to 3 hours manually on paper. A commercial tenant buildout of 10,000 square feet with supply, return, and exhaust systems takes 2 to 4 hours digitally and 6 to 10 hours manually. A 5-story commercial building with multiple air handlers, VAV systems, kitchen hood exhaust, and stairwell pressurization can take 6 to 10 hours digitally. The time savings with digital takeoff compound on larger projects because measurement groups carry over between floors. If floors 2 through 5 have identical layouts, you take off one floor completely and note the multiplier. Manual takeoffs require tracing each floor individually. Multi-building projects like apartment complexes show the biggest digital advantage because repeating units only need to be taken off once.

Organize your HVAC takeoff by system first, then by floor. Create measurement groups in this order: supply ductwork (trunk and branches), supply runouts (flex or round), return ductwork, exhaust ductwork, kitchen hood ductwork (if applicable), and refrigerant piping. Within each system, subgroup by floor for multi-story projects. For equipment and device counts, create groups by type: supply registers, return grilles, diffusers, VAV boxes, fire dampers, smoke dampers, volume dampers, access doors, RTUs, AHUs, condensing units, and exhaust fans. This organization matches how HVAC bids are structured. The duct fabrication scope, the equipment scope, the insulation scope, and the controls scope are typically separate line items or even separate subcontracts. Your takeoff groups should map directly to these bid divisions. Export to CSV and each group becomes a line on the bid sheet without manual reformatting. For very large projects, add a prefix to each group name with the building or wing designation so the CSV sorts cleanly.

Yes, and fittings are where many HVAC takeoffs fall short. Duct fittings include elbows (90-degree and 45-degree), tees, wyes, reducers, transitions (rectangular to round), end caps, offsets, and takeoff collars. On a commercial system, fittings can represent 20 to 30 percent of the total sheet metal fabrication cost. The sheet metal shop needs to know fitting quantities by type and size to price the fabrication accurately. When you trace a duct run with the polyline tool, each click point at a direction change represents a potential fitting. Count the direction changes in each trace to approximate elbow and tee quantities. For more precise fitting counts, create separate count groups for each fitting type and mark them individually on the plan. Most mechanical drawings show fittings symbolically. Elbows appear as curved sections, tees as T-junctions, and transitions as tapered sections. The waste factor for sheet metal duct already accounts for the extra material consumed in fabricating fittings, but the labor hours for installing fittings are significantly higher than for straight duct. Your estimator needs both the duct footage and the fitting count to price labor accurately.