Engineering Calculators
HVAC • Mechanical • Electrical — engineer-grade tools for daily work
← All Tools
Duct Size (CFM → Diameter)
Duct Pressure Loss (Pa)
Cooling Load (BTU/h)
Filter Face Velocity
ACH ↔ Airflow Converter
Rect ↔ Round Equivalent
Pump Head (m)
Cable Voltage Drop
Tip: These tools are "engineering practical" — fast estimates with transparent formulas. You can extend tables and standards anytime.