Process engineering calculator PEngCalc contains a set of 29 common calculators grouped into one software. The software aims to provide a productive environment for all users. The calculations are carried out and produced in summarized report that can be copied and used in other external calculations.

The software currently stands at 29 calculators but have the potential to grow further in the near future.

Process engineering calculator contains the calculators below;

Unit converter
Orifice Design Calculator
Control Valve Sizing Calculator
Relief Valve Sizing Calculator
API Gravity calculator
Cavitation Coefficient
Cavitation Number
Erosional Velocity calculator
Head loss calculator
Heat Exchanger Unknown Temperature Calculator
Heat Transfer rate or Heat duty calculator
Hydraulic Diameter calculator
Linear interpolation calculator
LMTD calculator
MMScfd Converter
Nozzle Pressure Drop calculator
Pipe Friction Factor Calculator
Pipe Sizing Calculator
Pumping Power Calculator
Reynold’s Number Calculator
Scale Resistance Calculator
Sonic Velocity Calculator
Vapor Pressure Calculator
Velocity in Pipe Calculator
Vessel Volume Calculator
Vessels Liquid Height Calculator
Fouling factors
Water and steam properties
P Props physical properties
Miller Equation calculator
Shell-MIT Equation calculator
Aude Equation calculator
Weymouth Equation calculator


1.Unit converter

23 measurements with 200 unit conversions.

2.Orifice Design Calculator

The following features is available For Gas or Liquid;Size an Orifice using International Standard ISO 5167-2:2003 EditionSize an Orifice using Crane’s Flow of Fluids through Valves, Fittings and Pipes (Eq.3.22)Support Corner tapping, D and D/2 tapping and Flange tapping for ISO method – D and D/2 tapping for Crane methodCalculate the Mass flow rate upstream of an OrificeCalculate velocity, pressure loss, Reynolds’ number, Coefficient of discharge, Beta, Cross sectional area and volumetric flow rate.Includes Standard pipe sizes, schedules, thicknesses…etc.Ability to plot a chart profile for Calculated Mass flow rates versus Calculated Orifice diameters

3.Control Valve Sizing Calculator

calculate the control valve sizing coefficient CV using Masoneilan method. Sizing options include;Gas and vapor service (Calculate CV or Flow rate from a given CV)Liquid service Turbulent flow (Calculate CV or Flow rate from a given CV)Liquid service Non-Turbulent flow (Calculate CV)Two phase flow service (Calculate CV or Flow rate from a given CV)

4.Relief Valve Sizing Calculator

Carry out calculations based on equations used in API 520 “7th Edition” and API 521 “4th Edition” evaluate multiple cases for;Sizing conventional and pilot operated relief valves for gas or vapour relief.Sizing conventional and pilot operated relief valves for liquid relief.Sizing conventional and pilot operated relief valves for saturated and superheated steam relief.Sizing conventional and pilot operated relief valves for vaporizing liquids (wetted vessels)

5.API Gravity calculator

American Petroleum Institute gravity is a term often used to measure how heavy or light a petroleum liquid is comparing to waterCalculating the API gravity from Liquid density or specific gravity or preloaded database of fluids.Calculate the specific gravity from API gravityCalculate the Barrels of crude oil per metric ton from API Gravity or select a fluid from the preloaded fluids database to perform the calculationFind the classification of oil according to API gravity (Light oil, Medium oil, Heavy oil or Extra heavy oil)

6.Cavitation Coefficient

Used for Fluid flow in centrifugal pump. The calculator can also calculate the pump head providing that the Cavitation coefficient is defined

7.Cavitation Number

Dimensionless number used in flow calculations analysis. the number reflects the relationship between the difference of a local pressure from the vapor pressure and the kinetic energy per volume, Cavitation number is used to characterize the potential of the flow to cavitate.Calculate the Cavitation NumberBack calculate the local Pressure or Fluid vapor Pressure or Fluid velocity

8.Erosional Velocity calculator

Use API RP 14E to estimate the erosional velocity, the calculator will calculate the following:Mixture DensityErosional velocityMinimum pipe cross sectional area

9.Head loss calculator

Calculate the head loss and pipe cross sectional area using Darcy Weisbach equation also plot profile charts of pipe cross sectional area versus head loss and velocity versus head loss

10.Heat Exchanger Unknown Temperature Calculator

Calculate any unknown one or two temperatures on the hot side or the cold side.

11.Heat Transfer rate or Heat duty calculator

Calculate the duty for sensible and latent heat transfe

12.Hydraulic Diameter calculator

Calculate the hydraulic diameter for rectangular, elliptical and annulus pipe types

13.Linear interpolation calculator

Perform linear interpolation between tabulated values.

14.LMTD calculator

Calculate the Log Mean Temperature Difference for counter current and co-current flow, also known as parallel flow arrangement.

15.MMScfd Converter

Convert mass flow or volume flow to Million Standard Cubic Feet per Day and vice versa

16.Nozzle Pressure Drop calculator

Calculate the pressure drop for nozzles in shell and tube heat exchangers

17.Pipe Friction Factor Calculator

Calculate the Darcy friction factor also commonly obtained from the Moody chart and also calculate the Fanning friction factor. Choose from two different equations CHURCHILL EQUATION or COLEBROOK-WHITE EQUATION

18.Pipe Sizing CalculatorCalculate the diameter of pipe. The calculator also has a predefined list of services the includes typical velocities which can be used for the velocity input.
19.Pumping Power Calculator

Calculate the following;

Pump hydraulic power

Shaft power

Motor power
20.Reynold’s Number CalculatorCalculate the Reynold’s number for turbulent and laminar flow
21.Scale Resistance CalculatorCalculate the scale resistance or Dirt factor for shell and tube heat exchangers
22.Sonic Velocity Calculator Calculate the gas sonic velocity (Speed of sound) in pipes. The calculator has a small database that contain 51 gases and their specific heat ratio along with their molecular weights for quick reference during calculation.
23.Vapor Pressure CalculatorUse Antoine equation constants to calculate the vapor pressure of fluids,

699 available components/fluids and their equation constants included in internal database.Calculate Vapor pressure at a specified temperatureCalculate the Temperature at specified Vapor pressure

24.Velocity in Pipe Calculator

Calculate the fluid velocity in pipe

25.Vessel Volume CalculatorCalculate the liquid volume and total volume of horizontal tank vessel, the calculator support Flat heads, ASME F&D (Dished) heads, Elliptical 2:1 Heads and Hemispherical heads
26.Vessels Liquid Height CalculatorCalculate the liquid height in a vessel. The calculator supports the following vessel ends; Flat Ends, ASME F&D (Dished Ends), Elliptical Ends and Hemispherical Ends. It can also plot a profile of the liquid volume versus the liquid height.
27.Fouling Factorsfouling factors for various fluids
28.Water and Steamgenerate water and steam properties
29.P Props DatabaseAn estimation tool that allows you to estimate physical properties for 500 fluids by inputting the temperature
30.Miller EquationUsed in hydraulics studies involving crude oil pipelines, can be used for calculating the flow rate from a given pressure drop or vice versa, the equation does not consider pipe roughness.
31.Shell-MIT EquationAlso known as MIT Equation is used for calculations of pressure drop in heavy crude oil and heated liquid pipelines.
32.Aude EquationAude equation or T.R Aude equation is used in industry to calculated the pressure drop in pipelines. The equation is used for petroleum products transported in pipelines.
33.Weymouth EquationUsed for gas pipeline systems when large pipe diameters are involved. Calculate the flow rate of gas in a pipeline. Use for compressed and high-pressure gases


Click here to download the demo version of the product. Please also note that the demo version of this software will only operate with set examples which are restricted in our demo version.  The full version of this product does not have any restrictions. The demo version may also have less calculators. to check the difference please check the demo version against the update version history

We don’t offer a fully working demo version.

To check the latest update history of this software please click here

Screen shots

To view screen shots please follow the links in our screen shots page

To see the video demonstration clip please click here or to check it out on YouTube click here

Process engineering calculator

System Requirement:

The software should run on Windows operating systems: Windows 7, Windows 8, Windows 8.1, Windows 10, Windows 11

Microsoft .Net 4.8 Client profile should be installed on your computer for the software to run, these system files are normally included with the latest windows platforms but need installations on Windows 7.

Mobile application version

There is a mobile version of this application available on Google play store, for more information please visit google play

Process Engineering Calculator Mobile App

Click to Purchase the mobile version