Example engineering calculations
Worked, unit-aware calculation worksheets across structural, mechanical, electrical and more. Open any example into your own workspace to edit and reuse. New to Calculeaf? Start with your first worksheet or the examples guide.
56 examples found
Series Pump Combination Total Head
The combined head produced by two pumps piped in series, each passing the same flow but adding its own head rise.
Parallel Pump Combination Total Flow
The combined flow delivered by two identical-head pumps piped in parallel, each contributing its own share of flow at a common head.
Sluice Gate Discharge
The flow rate passing beneath a partially raised sluice gate as a function of gate opening, width, discharge coefficient, and upstream head.
V-Notch (Triangular) Weir Flow Rate
The flow rate over a triangular V-notch weir as a function of notch angle and upstream head, a standard method for measuring small open-channel flows.
Siphon Discharge Velocity
The theoretical outlet velocity of a siphon driven purely by the elevation difference between the reservoir surface and the outlet.
Trapezoidal Channel Cross-Sectional Area
The wetted cross-sectional area of a trapezoidal open channel from its bottom width, flow depth, and side slope.
Air Duct Friction Pressure Loss (Darcy-Weisbach)
The pressure drop along a straight run of HVAC ductwork from air friction against the duct walls, using the same Darcy-Weisbach form used for pipe flow.
Two-Phase Flow Quality
The vapor mass fraction (quality) of a two-phase liquid-vapor mixture, defined as vapor mass flow divided by total mass flow.