Engineering Calculator Tools

Calculate air volumetric flow (CFM, m³/h, L/s) from duct size and air velocity for circular or rectangular ducts.

Calculate fluid velocity through pipes and channels based on flow rate and cross-sectional area.

Determine pressure losses in piping systems due to friction, fittings, and elevation changes.

Calculate hydraulic head loss in pipes using the Darcy-Weisbach equation and friction factors.

Determine optimal pipe diameters based on flow requirements and velocity constraints.

Calculate Reynolds number to determine flow regime (laminar, transitional, or turbulent).

Calculate tank volumes, fill times, and flow rates for storage and process applications.

Determine pump power requirements and efficiency for various hydraulic applications.

Calculate flow rate through orifice plates using differential pressure measurement based on ISO 5167.

Calculate flow over rectangular, V-notch, and Cipolletti weirs for open channel flow measurement.

Calculate open channel flow velocity and discharge using Manning's equation for various channel shapes.

Convert between GPM, LPM, m³/h, CFM, barrels/day, and more flow rate units instantly.

Convert pressure to flow rate and vice versa using the Hazen-Williams equation for pipe systems.

Interactive flow rate charts and capacity tables for standard pipe sizes at various design velocities.

Work out garden hose flow in GPM and litres per minute from hose diameter, length and supply pressure.

Work out how many gallons or litres a pipe holds from its size and length, with gallons per foot, water weight and fill time.

Work out the pump head you need from lift, outlet pressure, pipe friction and fittings, in feet, metres and psi.

Size a tankless water heater from the fixtures running at once and the temperature rise, in GPM, BTU/h and kW.

Calculate flow through nozzles and hose openings. Includes garden hose, fire hose, and spray nozzle presets.

Convert between mass and volumetric flow rates using fluid density. Common fluid presets included.

Calculate valve flow coefficient (Cv) for sizing valves. Supports liquid and gas calculations with ISA standards.

Calculate compressible gas flow rates with standard/actual volume conversions and choked flow detection.

Calculate how speed or impeller changes affect pump flow rate, head, and power using affinity laws.

Calculate thermal duty, LMTD, and required flow rates for heat exchangers using the LMTD method.

Find the most cost-effective pipe size by balancing material costs against pumping energy over the system lifetime.