Online calculators

GENERAL
Web 2.0 scientific calculator
Unit Converter
Area & Volume calculator
Moment of inertia for plane sections

FLUID PROPERTIES
Thermophysical properties of fluid systems (NIST)
Fluid property calculator (Industrial Refrigeration Consortium)
Curve fitting vapor pressure

FLUID FLOW
Compressible flow calculator
Moody friction factor calculator
Pressure loss in a pipe due to fittings such as elbows, tees, valves, expanders and reducers
Pressure drop in a straight pipe due to flow of a single phase incompressible fluid
Flow of a single phase compressible fluid through a pipe for a given pressure drop

PUMPS
Determine pump performance for different impeller diameter and speed based on affinity laws
Pump sizing calculation
Pump operation series & parallel

WIND TURBINES
Wind Turbine Power Calculator (Danish Wind Industry Association)

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