Dynamic Pressure Calculator

Calculate dynamic pressure of a flowing fluid using the formula pd = 1/2 ρ v². Supports both SI and Imperial units for fluid density and velocity calculations.

Calculator

Inputs

Fluid Density (ρ) (kg/m³)

Velocity (v) (m/s)

Results

Dynamic Pressure (pd)-- Pa

Dynamic Pressure (pd)-- kPa

Fluid	Temperature	Density (SI)	Density (Imperial)
Water	0°C / 32°F	1000 kg/m³	1.940 slugs/ft³
Water	20°C / 68°F	998 kg/m³	1.937 slugs/ft³
Air	20°C / 68°F	1.2 kg/m³	2.373×10⁻³ slugs/ft³
Air	0°C / 32°F	1.29 kg/m³	2.504×10⁻³ slugs/ft³

Formula

pd = 1/2 ρ v²

Where:

pd = dynamic pressure (Pa, N/m²)
ρ = density of fluid (kg/m³)
v = velocity (m/s)

Pressure Unit Conversions

1 Pa (N/m²) = 0.02089 lbf/ft² (psf)
1 Pa = 1.4504×10⁻⁴ psi
1 Pa = 1×10⁻⁵ bar
1 Pa = 0.1024 mm water

Example

For water at 20°C with density 1000 kg/m³ and velocity 5 m/s:

pd = 1/2 × 1000 × 5² = 12,500 Pa = 12.5 kPa