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MEPFP Calculator
One place for the everyday engineering numbers — duct, refrigerant piping, plumbing, electrical and fire protection — with every result tied to the standard it comes from.
Equal-friction sizing for round, rectangular and flat oval; gauge, transverse joints (S&D / TDC-TDF), reinforcement and tie rods by pressure class.
Fixture-unit builder, peak demand from the Appendix E curves, water pipe sizing by velocity, DFU drainage and storm leaders per the code tables.
Branch circuits for general equipment, motors (Art. 430) and HVAC compressors (Art. 440); conductor and ground sizing, conduit fill, pull boxes, voltage drop.
Density/area sprinkler demand, K-factor flow and pressure, hose allowance, supply duration and pipe friction.
Works in any browser, and installs as a standalone app on desktop and mobile (open it, then choose Install in your browser menu). Subscription: $10/month or $100/year, cancel any time before renewal; new accounts start with a 14-day free trial — no credit card required. Results are a design aid — the locally adopted codes and a licensed professional govern final design.