Fluid Mechanics Calculator

Perform common fluid mechanics calculations. Please use consistent SI units (kg, m, s, Pa) for inputs unless otherwise specified.

Calculate Flow Rates Use Continuity Equation

Fluid Density (ρ) kg/m³

Fluid Velocity (v) m/s

Area Input Type:

Pipe Diameter (D) m

Cross-sectional Area (A) m²

Velocity at Point 1 (v₁) m/s

Area Input Type (Point 1):

Diameter at Point 1 (D₁) m

Area at Point 1 (A₁) m²

Area Input Type (Point 2):

Diameter at Point 2 (D₂) m

Area at Point 2 (A₂) m²

Volumetric Flow Rate (Q): -- m³/s

Mass Flow Rate (ṁ): -- kg/s

Velocity at Point 2 (v₂): -- m/s

Calculate the dimensionless Reynolds Number to determine the flow regime (Laminar or Turbulent).

Fluid Density (ρ) kg/m³

Fluid Velocity (v) m/s

Characteristic Length (L) m (e.g., pipe diameter)

Dynamic Viscosity (μ) Pa·s or kg/(m·s)

Reynolds Number (Re): --

P₁ + ½ρv₁² + ρgh₁ = P₂ + ½ρv₂² + ρgh₂. Calculates P₂, v₂, or h₂ assuming no energy losses.

Fluid Density (ρ) kg/m³

Gravity (g) m/s²

Point 1 Conditions:

Pressure (P₁) Pa

Velocity (v₁) m/s

Height (h₁) m

Point 2 Conditions:

Variable to Calculate at Point 2:

Pressure (P₂) Pa

Velocity (v₂) m/s

Height (h₂) m

Calculated Value: --