Process engineering calculator PEngCalc contains a set of 25 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 25 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


No. Calculator Description
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 Edition

Size 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 method

Calculate the Mass flow rate upstream of an Orifice

Calculate 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 water

Calculating the API gravity from Liquid density or specific gravity or preloaded database of fluids.

Calculate the specific gravity from API gravity

Calculate the Barrels of crude oil per metric ton from API Gravity or select a fluid from the preloaded fluids database to perform the calculation

Find 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 Number

Back 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 Density

Erosional velocity

Minimum 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 transfer

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 Calculator

Calculate 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 Calculator

Calculate the Reynold’s number for turbulent and laminar flow

21. Scale Resistance Calculator

Calculate 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 Calculator

Use 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 temperature

Calculate the Temperature at specified Vapor pressure

24. Velocity in Pipe Calculator

Calculate the fluid velocity in pipe

25. Vessel Volume Calculator

Calculate 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 Calculator

Calculate 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.


The demo version of this product will function for 30 days with some limitations in some of the included calculators.

Click to Download Process Engineering Calculator

Screen shots

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

To see the video demonstration clip please click here

Process Engineering Calculator

System Requirement:

The software should run on Windows operating systems: Windows XP SP3, Windows Vista, Windows 7, Windows 8, Windows 8.1, Windows 10

Microsoft .Net 4.0 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 XP, Window Vista, 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 AppClick to Purchase the mobile version