Fluid and thermal calculators
Pre-size flow, pipe regimes, Bernoulli pressure, heat and conduction.
Use fluid properties and geometry from datasheets, then add losses and heat transfer.
Calculators in this category
Orifice Plate Flow (ISO 5167-2)
Calculate mass and volume flow from differential pressure across a standard orifice plate, including discharge coefficient and permanent pressure loss.
Open calculator →Tank Contents from the Fill Height
Calculate the contents of a horizontal or vertical cylinder or a rectangular tank from a measured fill height, solving the circular segment in closed form, with fill level, remaining capacity and litres per centimetre of level.
Open calculator →U-Value of a Building Component (ISO 6946)
Calculate the thermal transmittance of a layered wall, ceiling or roof to ISO 6946 from the layer build-up, with the resistance of each layer, the heat flow and the inside surface temperature and temperature factor that decide the mould risk.
Open calculator →Heat Exchanger LMTD Calculator
Calculate heat exchanger duty from UA and the logarithmic mean temperature difference (LMTD) for a constant-temperature cold side.
Open calculator →Pipe Insulation Heat Loss Calculator
Calculate the radial conductive heat loss through cylindrical pipe insulation.
Open calculator →Ideal Gas State Change Calculator
Calculate the new volume of a fixed gas mass after a change in pressure and temperature with the ideal gas law.
Open calculator →Fan Affinity Laws Calculator
Calculate flow, pressure and power of the same fan after a speed change using the fan affinity laws.
Open calculator →Dew Point Calculator (Magnus Formula)
Calculate dew point temperature or relative humidity from air temperature and the other quantity with the Magnus approximation.
Open calculator →Heat Pump Carnot Efficiency Calculator
Calculate the Carnot COP of a heat pump from its temperature levels and the quality grade compared with a real COP.
Open calculator →Mixing Temperature Calculator
Calculate the equilibrium temperature after mixing two masses with different temperatures and specific heat capacities.
Open calculator →Spherical Pressure Vessel Wall Thickness Calculator
Calculate the required wall thickness of a thin-walled spherical pressure vessel from internal pressure, diameter and allowable stress.
Open calculator →Buoyancy Force Calculator (Archimedes)
Calculate the buoyancy force on a fully submerged body from fluid density, gravitational acceleration and displaced volume.
Open calculator →Stokes Settling Velocity Calculator
Calculate the steady settling velocity of a small sphere in a viscous fluid under laminar creeping flow with Stokes' law.
Open calculator →Convective Heat Transfer Calculator
Calculate the heat flow between a surface and a flowing fluid from heat transfer coefficient, area and temperature difference.
Open calculator →Hydrostatic Pressure Calculator
Calculate the hydrostatic pressure at the base of a still liquid column from density, gravitational acceleration and height.
Open calculator →Volumetric Flow Rate Calculator
Calculate the volumetric flow rate from displaced volume and time.
Open calculator →Pipe Flow Velocity Calculator
Calculate the mean flow velocity in a pipe from volumetric flow rate and open cross-section.
Open calculator →Pipe Size Calculator from Flow and Velocity
Calculate the required open pipe cross-section for a target flow rate and allowable velocity.
Open calculator →Reynolds Number Calculator
Calculate the Reynolds number of a pipe flow from density, velocity, diameter and dynamic viscosity to find the flow regime.
Open calculator →Bernoulli Equation Calculator
Calculate pressure, density, velocity or elevation between two points of an ideal flow with the Bernoulli equation.
Open calculator →Heat Energy Calculator: Q = m·c·ΔT
Calculate the sensible heat needed to heat or cool a substance from mass, specific heat and temperature change.
Open calculator →Heating Power Calculator
Calculate the average heating or cooling power needed for a desired temperature change in a given time.
Open calculator →Hydraulic Power Calculator: Pressure and Flow
Calculate hydraulic or pneumatic useful power from pressure difference and flow rate.
Open calculator →Heat Conduction Calculator for a Plane Wall
Calculate the steady heat flow through a homogeneous wall from thermal conductivity, area, thickness and temperature difference.
Open calculator →Dynamic Pressure Calculator
Calculate dynamic pressure q, flow velocity v or fluid density ρ using q = ½ρv² – the velocity term of the Bernoulli equation for incompressible flow.
Open calculator →Thermal Expansion Calculator
Calculate the length change of a component from expansion coefficient, original length and temperature change.
Open calculator →Liquid Thermal Expansion Calculator
Calculate the minimum expansion space of a closed vessel from liquid volume, volumetric expansion coefficient and temperature change.
Open calculator →Pipe Wall Thickness Calculator (EN 13480-3)
Calculate the minimum wall thickness of a straight steel pipe under internal pressure to DIN EN 13480-3 for thin-walled pipes (da/di ≤ 1.7).
Open calculator →Pipe Thermal Expansion Force Calculator
Calculate the axial fixed-point force of a straight pipe fully restrained against thermal expansion from E-modulus, expansion coefficient, ΔT and wall area.
Open calculator →Pipe Support Spacing Calculator
Calculate the approximate support spacing of a horizontal straight steel pipe run from the pipe inside diameter.
Open calculator →Water Hammer Calculator (Joukowsky)
Calculate the maximum pressure surge from rapid valve closure from fluid density, pressure wave speed and change in flow velocity.
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