Top 10 Best Duct Calculator Software of 2026

TRACE 3D Plus is built around HVAC design inputs and then applies duct fitting and pressure loss calculations to reach duct selections that match the rest of the system model. It supports rectangular duct sizing outcomes and includes constraints needed to control airflow behavior during sizing runs. In typical workflows, engineers use it to generate a duct path that aligns with system performance targets and commissioning expectations for airflow distribution.

A tradeoff is that the workflow is optimized for Trane-centric HVAC modeling, so teams that want a neutral duct-only engine may need extra effort to map non-Trane equipment assumptions. TRACE 3D Plus fits teams producing design packages where duct sizing must stay consistent with heat transfer and airflow decisions already captured in the HVAC model. It is also well-suited for iterative design where change sets require the duct loss and sizing outputs to update without rebuilding the entire analysis.

Carmel Software Duct Calculator fits teams that need consistent duct dimension outputs for load cases and system studies, including static pressure allocation. The calculator emphasizes friction-loss and equivalent-length style loss handling so designers can adjust duct sizes and flow assumptions quickly. Results are computed from the chosen duct geometry and airflow inputs, with options to include loss contributors so the pressure budget reflects fittings and run length.

A key tradeoff is limited model interoperability since the workflow is calculation-first rather than model-first. Carmel Software Duct Calculator works best when the goal is a repeatable sizing spreadsheet for review and coordination, not when the deliverable is a duct layout file for installation. It is also better used for focused sizing packages than for end-to-end design documentation that spans model edits across systems.

Revit MEP can manage duct runs as elements tied to system types, which enables consistent sizing inputs across design drawings and schedules. Duct fitting library content and mechanical system parameters let teams generate downstream reporting for coordination. Automation is available through the Revit API and add-in extensibility points, which supports repeatable configuration for pressure loss rules and schedule outputs.

A key tradeoff is that Revit’s duct sizing behavior depends on how the MEP system settings and calculated parameters are configured for the project, so models created with inconsistent standards can produce inconsistent results. Revit fits best when duct sizing and layout must remain synchronized with coordination outputs like ducts, fittings, and tags for commissioning-style airflow reports.

Ductsize from elitesoft.com focuses on duct sizing workflows that support common HVAC sizing methods and outputs for design checks. It provides a calculator-centric experience with input forms for duct dimensions and airside targets, then returns calculated pressure and sizing results needed for selection.

The product is oriented around consistent calculations across rectangular and circular ductwork scenarios rather than model-based authoring. It also supports common file exchange needs for bringing layouts and dimensions into downstream documentation workflows.

ASHRAE Duct Fitting Database provides a reference duct fitting library used to determine fitting loss coefficients for duct system calculations. It is distinct because the content is curated as fitting-specific lookup data rather than being a full duct sizing workflow tied to one CAD or simulation stack.

The database supports friction loss planning by mapping common fitting types to coefficient values used in standard duct sizing methods. In practice, it fits into workflows where duct design teams already compute pressure loss and need defensible fitting data.

Design Master HVAC is a duct calculator focused on producing duct sizes from entered airflows and layout details, with guidance around ductwork construction assumptions.

The workflow emphasizes selecting duct options and verifying pressure loss inputs through a calculator-driven sizing result rather than a general drawing-first tool.

It supports practical handoff by exporting or reusing ductwork data for downstream documentation.

It fits teams that need consistent sizing outputs across projects and want less manual math than spreadsheets.

Wrightsoft Right Suite centers on duct sizing workflows tied to HVAC design specifications and project documentation, rather than generic geometry tools. It supports duct dimensioning based on selectable design approaches and includes detailed fitting and loss handling needed for ventilation system calculations. The suite’s distinguishing angle is tight linkage between sizing outputs and drafting deliverables, which reduces rework when drawings and schedules need to match the calculated duct runs.

Cool Calc is a duct calculator tool built for fast duct sizing with workflow-style inputs for air flow, duct geometry, and pressure loss. It focuses on engineering calculations like equivalent diameter conversion, fitting loss coefficient handling, and pressure drop budgeting across straight runs and transitions.

The software emphasizes repeatable result outputs that can be used in design iterations when duct sizes must be compared quickly. Export and interoperability depend on its available output formats, so workflow fit hinges on whether those formats match downstream needs in the BIM or plan production chain.

Carrier HAP calculates heating and cooling loads with duct and airflow sizing inputs tied to building zone definitions. The workflow uses a structured psychrometric and air system model to carry results from room loads through air distribution assumptions.

Duct sizing outputs are driven by selected duct runs, available pressure assumptions, and airflow targets rather than a purely geometry-first calculator. It fits duct sizing as part of a broader HVAC performance model that needs consistent assumptions across zones and terminals.

Greenheck Ductulator is a duct sizing calculator focused on quick, repeatable duct sizing using selectable method options and standard input fields for airflow, duct geometry, and pressure loss. Core calculations include friction loss and fitting loss contributions so sized ducts reflect both straight-run pressure effects and common component impacts.

Results are delivered as worksheet-style outputs that support iterative adjustments for diameter, size, and selected loss assumptions. Integration depth is limited compared with CAD-linked workflows, but Greenheck Ductulator is built to move efficiently from design inputs to duct size candidates.