• Clean, free, unlimited energy for allCLEAN, FREE, UNLIMITED ENERGY
  • Earth's renewable energyEARTH'S RENEWABLE ENERGY
  • Eliminate batteries, wind turbines and solar panelsELIMINATE BATTERIES, WIND TURBINES & SOLAR PANELS
  • 100% perfect medicines in minutesPERFECT MEDICINES IN MINUTES
  • Eliminate surface skin-frictionELIMINATE SKIN FRICTION
Clean, free, unlimited energy1 Earth's renewable energy2 Eliminate batteries, wind turbines and solar panels3 100% perfect medicines in minutes4 Eliminate surface skin-friction5
Available Now 2ᴺᴰ Moment of Area 2ᴺᴰ Moment of Area+ Added Mass & Drag Areas & Volumes Atoms Balancing (rotary) Beam Strength Beam Strength+ Bearings (low friction) Bearings (plain) Belt Drives Bending Moments BiMetallic Strip Buoyancy Carbon Steel Catenary Catenary+ Cathodic Protection Centrifugal Force Colebrook & Fanning Column Buckling Combined Stress Co-ordinates Copper Alloys Core Pressure Electrical Current Elliptical Curves Engineering Basics Explosions Fans Fatigue Flange Gaskets Flanges Floors Fluid Forces Fluid Numbers Friction Galvanic Corrosion Gears Hardness Conversion HPHT Flexible Pipe Lift Rigging Logs & Trig Machining Tolerances Metal Properties Mode Shapes Mode 14 Newton's Laws of Motion Ocean Waves Optical Lenses Padeyes Partial Pressures Piling Pipe Flow Pipe Flow+ Pipe Strength Planetary Spin Plastic Stress in Beams Plate Deflection Pressure Vessels Reel Capacity Resolution of Forces Screw Thread Machining Screw Threads Shafts Shock Loads Spring Coefficients Spring Strength Steel Beam Sizes Stress Concentration Table of the Elements Thermal Conductivity Trigonometry UniQon Upheaval Buckling Velocity & Acceleration Vessel Motions Vessel RAOs Vibration Damping Vortex Shedding Walls, Barriers & Tanks Weight Lifting Welding Wire Rope

Home » All Programs

Calculator Description
Fan Calculator v1
The fan calculator determines the performance characteristics of generic, axial and centrifugal fans based upon applied power and blade design.

Fans (axial and centrifugal)


Whilst most fan designs (axial, Sirocco, centrifugal, etc.) are suitable for many applications including; extraction, distribution, compression, etc. and their performance is almost entirely governed by blade design and rotational speed, flow and head characteristics are generally governed by the fan's inlet and/or outlet ducts.

Most technical reference books and related data sites make this subject a little more complicated than it needs to be. CalQlata has tried to simplify the subject with the fan calculator and its technical help page on this website.


You calculate the performance characteristics of the blade using either the Axial or Centrifugal calculation option; the output data from which you use to calculate the performance of the fan.


The performance of a generic fan is based upon volumetric flow rate and blade efficiency (both of which can be determined using the Axial and Centrifugal calculation options), the outlet area of the fan diffuser and the inlet and outlet atmospheric conditions.

The generic calculation option therefore defines the performance characteristics of the fan using calculation results from Axial or Centrifugal.

Axial & Centrifugal (fan-blade design)

Whilst these calculation options are primarily for the performance characteristics of an impeller (via blade configuration), they also offer the performance effects of an external casing.

Their output data can be used for input in the Generic calculation option.

Fans provides the most efficient blade inlet angle (minimum inlet loss) should you wish to use it. You alter the outlet angle manually in order to minimise the outlet loss and thereby maximise impeller efficiency.

Fans also provides lists of various output data (against rising impeller speed) for plotting in your preferred spreadsheet.


For help using this calculator see Technical Help

Fans Calculator - Options


... calculates the performance characteristics of a generic fan with regard to the change in properties and behaviour of the air from inlet conditions to outlet

You enter: and the Fans calculator will provide:
  • Volume flow rate
  • Inlet pressure
  • Outlet pressure
  • Temperature
  • Relative atomic mass
  • Outlet area
  • Source volume
  • Efficiency
  • Universal gas constant
  • Gravitational acceleration
  • Fan power
  • Mass flow rate
  • Mole flow rate
  • Velocity
  • Inlet density
  • Outlet density
  • Velocity pressure
  • Discharge pressure
  • Static pressure
  • Pressure head
  • Rate of change of the ‘Source volume’

AXIAL (Blade Design)

... calculates the performance characteristics of your axial fan based upon its blade configuration and rotational speed

CENTRIFUGAL (Blade Design)

... calculates the performance characteristics of your centrifugal fan based upon its blade configuration and rotational speed

... both of which utilise the same input and output data as follows:

You enter: and the Fans calculator will provide:
  • Impeller speed
  • Blade inlet angle
  • Blade outlet angle
  • Impeller inside diameter
  • Impeller outside diameter
  • Impeller width
  • Inlet air density
  • Inlet air pressure
  • Inlet air temperature
  • Gravitational acceleration
  • Specific gas constant
  • Frictional resistance (air)
  • Ratio of specific heats
  • Number of blades in the impeller
  • Casing outlet area
  • Volume flow rate
  • Torque required to drive air
  • Power required to drive air
  • Pressure increase across impeller
  • Air density at impeller outlet
  • Head generated (before losses)
  • Inlet shock loss (head)
  • Frictional loss (head)
  • Outlet loss (head)
  • Head (after losses)
  • Head loss efficiency
  • Alternative head loss efficiency
  • Isentropic efficiency
  • Absolute inlet velocity
  • Absolute outlet velocity
  • Axial inlet velocity
  • Axial outlet velocity
  • Impeller inlet velocity
  • Impeller outlet velocity
  • Inlet velocity over blade
  • Outlet velocity over blade
  • Inlet rotational velocity
  • Outlet rotational velocity
  • Impeller outlet and inlet areas
  • Pressure inside casing outlet
  • Air-velocity inside casing outlet
  • Air-density inside casing outlet
  • Head at casing outlet
  • Power consumption due to casing

Note: Fans is a universal calculation tool. For final design purposes, CalQlata would recommend that you use the specification and procedures issued by your supplier for the selected product.

Check minimum system requirements

Price: 30.00

« Previous | Next »

We accept the following payment methods

Credit Cards

      Go to our store
CalQlata™ Copyright ©2011-2019 CalQlata info@calqlata.com Site Map Terms of website use Our Store