MEP design automation software for faster sizing, calculations, and layouts
MEPFlow helps mechanical designers automate HVAC duct sizing, ventilation calculations, diffuser selection, plumbing pipe sizing, and hydronic sizing in one web-based workflow.
Built for mechanical designers, MEP consultants, HVAC designers, and plumbing designers working on real building projects.
No software installation required. Upload a PDF floor plan and start designing directly in your browser.
What MEPFlow automates
Automate the repetitive engineering work that usually lives across spreadsheets, calculators, PDFs, catalogs, and manual design checks.
- Automatic duct sizing
- Round and rectangular ductwork
- PDF-based layout workflow
- Faster HVAC design iterations
- Outdoor air calculations
- Space-by-space ventilation
- HVAC design inputs
- Faster ventilation schedules
- Automatic terminal selection
- Airflow-based selection
- Canadian manufacturer workflows
- Less manual catalog lookup
- Fixture unit workflows
- Hot and cold water sizing
- Pipe sizing automation
- Faster plumbing layouts
- Heating water pipe sizing
- Chilled water pipe sizing
- Coil and equipment flow logic
- Pump head workflow foundation
Built around real engineering workflows
MEPFlow is not just a set of calculators. It is built around the way designers actually move from floor plans to sizing, selections, schedules, and design decisions.
ASHRAE-style HVAC ventilation workflows
Outdoor air and ventilation calculations built on the methods designers already use.
Equal-friction HVAC duct sizing logic
Practical sizing logic that mirrors how mechanical designers approach real ductwork.
Canadian plumbing fixture-unit workflows
Domestic water pipe sizing using fixture-unit based methods grounded in Canadian practice.
Manufacturer-based diffuser and grille selection
Selection logic built around real manufacturer catalog data, not generic placeholders.
Hydronic flow and pipe sizing workflows
Heating and chilled water pipe sizing tied to coil flows and connected equipment loads.
Export-ready design outputs
Schedules and outputs designed to drop into project documentation without rework.
Live workflows available now
MEPFlow already supports core MEP automation workflows today, with additional modules actively being expanded.
How MEPFlow works
Move from floor plan to sizing outputs without rebuilding calculations manually every time.
Upload your floor plan
Use a PDF floor plan as the design background, calibrate scale, and work directly on top of the drawing.
Lay out your system
Place equipment, draw ductwork or piping, add diffusers, grilles, fixtures, and connected system components directly on the plan.
Run automatic sizing
MEPFlow uses the layout, airflow, fixture units, equipment loads, and design inputs to automate sizing and calculation workflows.
Review and export results
Review calculated sizes, selections, schedules, and design outputs so the repetitive work is completed faster and more consistently.
Why mechanical designers use MEPFlow
MEPFlow is built to reduce repetitive design work, not just digitize it.
Stop rebuilding the same duct sizing, ventilation, plumbing, and hydronic calculations across disconnected spreadsheets.
Upload a floor plan, calibrate scale, and work directly from the drawing instead of calculating everything separately.
Automatically size ductwork, plumbing pipes, hydronic pipes, and ventilation workflows from real design inputs.
Use embedded selection logic for diffusers, grilles, terminals, and future equipment workflows.
Designed for mechanical designers and consulting engineers who need fast, practical, design-ready workflows.
No software installation required. Access MEPFlow through the browser and start from project layouts instead of disconnected desktop tools.
From the Founder
Built from real MEP workflow frustration
MEPFlow was built from a simple problem: too much MEP design time is still lost to repetitive manual sizing, disconnected spreadsheets, repeated catalog lookups, and duplicated calculations.
The goal is to automate as much of that repeatable engineering work as possible — from HVAC duct sizing and ventilation calculations to plumbing, hydronics, selections, and future MEP workflows — so designers can spend less time repeating calculations and more time making real design decisions.
Abbas Dharamsi
Founder, MEPFlow
Free Engineering Calculators
Quick HVAC calculations, built for working engineers.
Common questions
Everything mechanical designers ask before getting started with MEPFlow.
MEPFlow is a web-based MEP design automation platform for mechanical designers and MEP consultants. It helps automate repetitive workflows such as HVAC duct sizing, HVAC ventilation calculations, diffuser and grille selection, plumbing pipe sizing, and hydronic pipe sizing.
MEPFlow is built for mechanical designers, HVAC designers, plumbing designers, MEP consultants, and engineering teams that want to reduce spreadsheet-heavy design work and speed up repetitive sizing workflows.
MEPFlow currently supports HVAC duct design, HVAC ventilation calculations, diffuser and grille selection, plumbing pipe sizing, and hydronic pipe sizing, with additional MEP workflows continuing to expand.
No. MEPFlow is designed to work from project layouts and PDF floor plans. Instead of only entering values into isolated calculators, users can draw systems, place components, and automate sizing from the actual design workflow.
No. MEPFlow is fully web-based. Users can log in through the browser, upload project floor plans, and begin working without installing desktop software.
Yes. MEPFlow is live and available for teams looking to streamline repetitive MEP sizing and calculation workflows.
Traditional workflows often require separate spreadsheets, calculators, PDFs, catalogs, and manual checks. MEPFlow is built to combine layout, sizing, calculations, and selections into one connected workflow.
Start designing faster with MEPFlow
Replace spreadsheets and disconnected calculators with one web-based workflow for HVAC, plumbing, and hydronic design.
No software installation required. Start designing in your browser.