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.
24 examples found
Ideal Gas Amount (Moles)
Number of moles of an ideal gas from pressure, volume and temperature.
Solution Molarity
Molar concentration of a solution from moles of solute and volume.
Solution Dilution
Concentration after diluting a stock solution to a larger volume.
Stirred-Tank Reynolds Number
Impeller Reynolds number characterising mixing in a stirred tank.
Arrhenius Rate Constant
Reaction rate constant from the Arrhenius equation.
Solution pH
pH of a solution from its hydrogen-ion concentration.
Heat of Reaction
Total heat released or absorbed by a reaction from its molar enthalpy.
Partial Pressure (Dalton’s Law)
Partial pressure of a gas component from its mole fraction and total pressure.
Osmotic Pressure
Osmotic pressure of a dilute solution from its molar concentration.
Mass from Moles
Mass of a substance from its amount and molar mass.
Isothermal Compressor Work
Work to compress a gas isothermally from one pressure to another.
Stirred-Tank Mixing Power
Power drawn by an impeller in a stirred tank from the power number.
Particle Settling Velocity (Stokes)
Terminal settling velocity of a small particle in a fluid by Stokes’ law.
Steady-State Mass Balance
Outlet mass flow from a steady-state balance of two inlet streams.
Distillation Column Reflux Ratio
The ratio of liquid returned to the top of a distillation column versus product drawn off, the main knob operators turn to trade separation quality against energy cost.
Heat Released by Fuel Combustion
The total chemical energy released when a known mass of fuel is burned, found from its higher heating value.
CSTR Reactor Residence Time
The average time a fluid element spends inside a continuously stirred tank reactor, the key variable that controls conversion.
PFR Conversion for a First-Order Reaction
The fractional conversion achieved in a plug-flow reactor running a first-order reaction, from the rate constant and residence time.
Mass Transfer NTU from a Volumetric Coefficient
The number of transfer units (NTU) for a mass-transfer contactor, built from a lumped volumetric mass-transfer coefficient and the contact time.
Minimum Fluidization Velocity (Simplified Force Balance)
The superficial gas velocity at which drag on a bed of particles just balances their submerged weight, marking the onset of fluidization.
Evaporator Steam Economy
The ratio of water vapor evaporated to steam consumed in a process evaporator, a key efficiency metric for concentration plants.
Absorption Column Packing Height (HTU–NTU)
The required packing height for a gas absorption column, found from the height of a transfer unit times the number of transfer units needed.
Dilution to a Target Concentration
The volume of solvent needed to dilute a stock solution down to a target concentration, from the conservation of solute mass.
Vapor Pressure Estimate (Antoine Equation)
An estimate of a liquid's vapor pressure at a given temperature using the empirical three-constant Antoine equation.