Engineering / Flow & heat math.
Fluid & Thermal
Duct, pipe, refrigerant, BTU, and tankless sizing for HVAC and plumbing professionals.
9 tools available
Manual J Lite Load Calculator
Estimate room-by-room heating and cooling loads.
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Duct Sizing & CFM by Friction
Size duct runs from CFM and friction rate.
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Refrigerant Target Superheat & Subcool
Get the right superheat or subcool target by gas.
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Furnace & AC BTU Sizing
Match a unit's capacity to the home.
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Pipe Schedule ID/OD Lookup
Find inside diameter, wall thickness, and weight per foot for any schedule.
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Boiler Heat Load by EDR
Convert EDR (sq ft) into MBH for steam or hot-water boilers.
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Chilled Water Pipe Sizing
Pick a chilled water pipe by GPM and ΔT with velocity caps.
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Closed-Loop Expansion Tank Sizing
Pick a diaphragm expansion tank for a hydronic or hot-water loop.
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Natural Gas Pipe Sizing (BTU)
Match gas pipe length and BTU load to the right nominal size.
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