Velocity Pressure Calculator

✖Velocity Exposure Coefficient is evaluated at some height z.ⓘ Velocity Exposure Coefficient [K_z]			+10% -10%
✖Topographic Factor are also called indirect factors as they influence the growth and development of organisms by bringing variations in climatic factors.ⓘ Topographic Factor [K_zt]			+10% -10%
✖Wind Directionality Factor reflects the fact that the climatologically and aerodynamically or dynamically most unfavourable wind directions typically do not coincide.ⓘ Wind Directionality Factor [K_d]			+10% -10%
✖Basic Wind Speed is the wind speed corresponding to a 3-s gust speed at 33 ft above the ground in Exposure C.ⓘ Basic Wind Speed [V_B]			+10% -10%
✖Importance Factor for End Use is the factor whose value lies in range 0.8 to 1.2.ⓘ Importance Factor for End Use [I]			+10% -10%

✖Velocity Pressure is the pressure required to accelerate air from zero velocity to some velocity and is proportional to the kinetic energy of the air stream.ⓘ Velocity Pressure [q]

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Formula

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Velocity Pressure

Formula

`"q" = 0.00256*"K"_{"z"}*"K"_{"zt"}*"K"_{"d"}*("V"_{"B"}^2)*"I"`

Example

`"20pdl/ft²"=0.00256*"0.85"*"25"*"0.78"*(("29.6107m/s")^2)*"0.8"`

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Velocity Pressure Solution

STEP 0: Pre-Calculation Summary

Formula Used

Velocity Pressure = 0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*(Basic Wind Speed^2)*Importance Factor for End Use
q = 0.00256*K_z*K_zt*K_d*(V_B^2)*I
This formula uses 6 Variables

Variables Used

Velocity Pressure - (Measured in Pascal) - Velocity Pressure is the pressure required to accelerate air from zero velocity to some velocity and is proportional to the kinetic energy of the air stream.
Velocity Exposure Coefficient - Velocity Exposure Coefficient is evaluated at some height z.
Topographic Factor - Topographic Factor are also called indirect factors as they influence the growth and development of organisms by bringing variations in climatic factors.
Wind Directionality Factor - Wind Directionality Factor reflects the fact that the climatologically and aerodynamically or dynamically most unfavourable wind directions typically do not coincide.
Basic Wind Speed - (Measured in Meter per Second) - Basic Wind Speed is the wind speed corresponding to a 3-s gust speed at 33 ft above the ground in Exposure C.
Importance Factor for End Use - Importance Factor for End Use is the factor whose value lies in range 0.8 to 1.2.

STEP 1: Convert Input(s) to Base Unit

Velocity Exposure Coefficient: 0.85 --> No Conversion Required
Topographic Factor: 25 --> No Conversion Required
Wind Directionality Factor: 0.78 --> No Conversion Required
Basic Wind Speed: 29.6107 Meter per Second --> 29.6107 Meter per Second No Conversion Required
Importance Factor for End Use: 0.8 --> No Conversion Required

STEP 2: Evaluate Formula

Substituting Input Values in Formula

q = 0.00256*K_z*K_zt*K_d*(V_B^2)*I --> 0.00256*0.85*25*0.78*(29.6107^2)*0.8

Evaluating ... ...

q = 29.7632832832957

STEP 3: Convert Result to Output's Unit

29.7632832832957 Pascal -->20.0000029648233 Poundal per Square Foot (Check conversion here)

FINAL ANSWER

20.0000029648233 ≈ 20 Poundal per Square Foot <-- Velocity Pressure

(Calculation completed in 00.004 seconds)

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Credits

Created by Mridul Sharma

Indian Institute of Information Technology (IIIT), Bhopal

Mridul Sharma has created this Calculator and 200+ more calculators!

Verified by Mithila Muthamma PA

Coorg Institute of Technology (CIT), Coorg

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< 16 Wind Loads Calculators

Basic Wind given Velocity Pressure

Go Basic Wind Speed = sqrt(Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*Importance Factor for End Use))

Wind Directionality Factor given Velocity Pressure

Go Wind Directionality Factor = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Importance Factor for End Use*Basic Wind Speed^2)

Topographic Factor given Velocity Pressure

Go Topographic Factor = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Importance Factor for End Use*Wind Directionality Factor*Basic Wind Speed^2)

Importance Factor given Velocity Pressure

Go Importance Factor for End Use = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*Basic Wind Speed^2)

Importance Factor using Velocity Pressure

Go Importance Factor for End Use = Velocity Pressure/(0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*Basic Wind Speed^2)

Velocity Pressure

Go Velocity Pressure = 0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*(Basic Wind Speed^2)*Importance Factor for End Use

Velocity Pressure at given Point as given by ASCE 7

Go Velocity Pressure at Point = ((Velocity Pressure*Gust Response Factor*External Pressure Coefficient)-Wind Pressure)/Internal Pressure Coefficient

External Pressure Coefficient as given by ASCE 7

Go External Pressure Coefficient = (Wind Pressure+Velocity Pressure at Point*Internal Pressure Coefficient)/(Gust Response Factor*Velocity Pressure)

Internal Pressure Coefficient as given by ASCE 7

Go Internal Pressure Coefficient = ((Velocity Pressure*Gust Response Factor*External Pressure Coefficient)-Wind Pressure)/Velocity Pressure at Point

Velocity Pressure as given by ASCE 7

Go Velocity Pressure = (Wind Pressure+Velocity Pressure at Point*Internal Pressure Coefficient)/(Gust Response Factor*External Pressure Coefficient)

Gust Effect Factor as given by ASCE 7

Go Gust Response Factor = (Wind Pressure+Velocity Pressure at Point*Internal Pressure Coefficient)/(Velocity Pressure*External Pressure Coefficient)

Wind Pressure as given by ASCE 7

Go Wind Pressure = Velocity Pressure*Gust Response Factor*External Pressure Coefficient-Velocity Pressure at Point*Internal Pressure Coefficient

Gust Response Factor using Wind Pressure

Go Gust Response Factor = Wind Pressure/(Velocity Pressure*Pressure Coefficient)

Pressure Coefficient using Wind Pressure

Go Pressure Coefficient = Wind Pressure/(Velocity Pressure*Gust Response Factor)

Velocity Pressure using Wind Pressure

Go Velocity Pressure = Wind Pressure/(Gust Response Factor*Pressure Coefficient)

Equivalent Static Design Wind Pressure

Go Wind Pressure = Velocity Pressure*Gust Response Factor*Pressure Coefficient

Velocity Pressure Formula

Velocity Pressure = 0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*(Basic Wind Speed^2)*Importance Factor for End Use
q = 0.00256*K_z*K_zt*K_d*(V_B^2)*I

What is Velocity Pressure?

Velocity Pressure is that pressure required to accelerate air from zero velocity to some velocity (V) and is proportional to the kinetic energy of the air stream.

How to Calculate Velocity Pressure?

Velocity Pressure calculator uses Velocity Pressure = 0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*(Basic Wind Speed^2)*Importance Factor for End Use to calculate the Velocity Pressure, The Velocity Pressure is defined as the velocity pressure when we know the basic wind speed and other factors affecting the velocity pressure like wind directionality factor, topographic factor etc. Velocity Pressure is denoted by q symbol.

How to calculate Velocity Pressure using this online calculator? To use this online calculator for Velocity Pressure, enter Velocity Exposure Coefficient (K_z), Topographic Factor (K_zt), Wind Directionality Factor (K_d), Basic Wind Speed (V_B) & Importance Factor for End Use (I) and hit the calculate button. Here is how the Velocity Pressure calculation can be explained with given input values -> 27.03837 = 0.00256*0.85*25*0.78*(29.6107^2)*0.8.

FAQ

What is Velocity Pressure?

The Velocity Pressure is defined as the velocity pressure when we know the basic wind speed and other factors affecting the velocity pressure like wind directionality factor, topographic factor etc and is represented as q = 0.00256*K_z*K_zt*K_d*(V_B^2)*I or Velocity Pressure = 0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*(Basic Wind Speed^2)*Importance Factor for End Use. Velocity Exposure Coefficient is evaluated at some height z, Topographic Factor are also called indirect factors as they influence the growth and development of organisms by bringing variations in climatic factors, Wind Directionality Factor reflects the fact that the climatologically and aerodynamically or dynamically most unfavourable wind directions typically do not coincide, Basic Wind Speed is the wind speed corresponding to a 3-s gust speed at 33 ft above the ground in Exposure C & Importance Factor for End Use is the factor whose value lies in range 0.8 to 1.2.

How to calculate Velocity Pressure?

The Velocity Pressure is defined as the velocity pressure when we know the basic wind speed and other factors affecting the velocity pressure like wind directionality factor, topographic factor etc is calculated using Velocity Pressure = 0.00256*Velocity Exposure Coefficient*Topographic Factor*Wind Directionality Factor*(Basic Wind Speed^2)*Importance Factor for End Use. To calculate Velocity Pressure, you need Velocity Exposure Coefficient (K_z), Topographic Factor (K_zt), Wind Directionality Factor (K_d), Basic Wind Speed (V_B) & Importance Factor for End Use (I). With our tool, you need to enter the respective value for Velocity Exposure Coefficient, Topographic Factor, Wind Directionality Factor, Basic Wind Speed & Importance Factor for End Use and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.

How many ways are there to calculate Velocity Pressure?

In this formula, Velocity Pressure uses Velocity Exposure Coefficient, Topographic Factor, Wind Directionality Factor, Basic Wind Speed & Importance Factor for End Use. We can use 2 other way(s) to calculate the same, which is/are as follows -

Velocity Pressure = Wind Pressure/(Gust Response Factor*Pressure Coefficient)
Velocity Pressure = (Wind Pressure+Velocity Pressure at Point*Internal Pressure Coefficient)/(Gust Response Factor*External Pressure Coefficient)

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