Projects mix SI and US units all the time: a chiller in tons of refrigeration, a fan in CFM, a sprinkler density in gpm/ft². Pick the quantity, type a value and see it in every common unit at once.
How to use it
- Choose the quantity: power, airflow, water flow, pressure, sprinkler density, length, area or temperature.
- Enter the value and the unit you have.
- Read all the other units in the table.
- Bookmark the page — it works on your phone on site.
Step-by-step guides
- VRF Connection Ratio: How to Select the Right Outdoor Unit
- Sprinkler Hydraulic Calculation: A Step-by-Step Worked Example
- Duct Sizing Guide: Equal Friction, Fittings and the Index Run
More free tools
- Sprinkler Flow & Pressure Calculator (q = K√p)
- Duct Size Calculator — Round & Rectangular Ducts
- Heating & Chilled Water Pipe Size Calculator
- All free MEP calculators
- MEP Library
Results are for preliminary design and checking. Always confirm against the standard edition and local regulations that apply to your project.
MEP Center
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CAD block libraries, detail drawings and AutoCAD tools made by practising MEP engineers.