Explore fluid mechanics calculators for pipe flow, pressure drop, friction factor, Pitot tube velocity, siphon flow, boundary layer thickness, culvert sizing, sluice gate discharge, shock waves, and vortex shedding.
These tools are built for engineering students, mechanical engineers, civil engineers, aerospace learners, hydraulic designers, and technical users who need quick formula-based estimates.
Fluid mechanics calculations are used to estimate how liquids and gases move through pipes, ducts, channels, nozzles, gates, and around surfaces. This hub groups calculators for pressure drop, friction factor, velocity measurement, open-channel flow, boundary layer behavior, compressible flow, and unsteady flow patterns.
Use these calculators for learning, early estimates, homework checks, and engineering comparison studies before validating with real measurements, standards, and detailed design methods.
Use these calculators for flow in pipes, velocity measurement, siphon flow, pressure loss, and friction factor estimation.
Estimate pipe pressure loss from flow rate, pipe diameter, length, roughness, density, and viscosity assumptions.
Find pipe friction factor from Reynolds number and relative roughness using Moody-style friction factor relationships.
Calculate fluid velocity from total pressure, static pressure, and density using the Pitot tube method.
Estimate siphon flow rate from height difference, pipe diameter, and simplified hydraulic assumptions.
Use these tools for flow over surfaces, boundary layer thickness, and non-dimensional flow behavior.
Calculate laminar or turbulent boundary layer thickness over a flat plate using distance, velocity, density, and viscosity.
Calculate Strouhal number from shedding frequency, characteristic length, and flow velocity.
Use these calculators for culverts, sluice gates, drainage, and simplified civil hydraulic estimates.
Size a box culvert from flow rate, slope, roughness, width, height, and hydraulic assumptions.
Estimate discharge under a sluice gate using gate opening, width, head, and discharge coefficient assumptions.
Use this calculator for shock-wave and gas-flow learning problems.
Determine post-shock properties for compressible flow using upstream Mach number and gas-property assumptions.
Use these tools to check fluid mechanics homework, understand equations, and compare laminar, turbulent, open-channel, and compressible flow assumptions.
Use the calculators for early estimates and sanity checks before detailed CFD, standards-based hydraulic design, pump selection, or field testing.
Use these calculators to document assumptions, compare scenarios, estimate flow behavior, and explain pressure, velocity, friction, and discharge relationships.
Reynolds number compares inertial and viscous effects:
Darcy-Weisbach pressure drop is commonly written as:
Pitot tube velocity for incompressible flow is often estimated by:
Strouhal number relates frequency, length, and velocity:
Sluice gate discharge is commonly approximated by:
| Calculator | Best for | Main idea |
|---|---|---|
| Pressure Drop Calculator | Pipe pressure loss | Darcy-Weisbach relationship |
| Moody Chart Calculator | Pipe friction factor | Reynolds number and roughness |
| Pitot Tube Calculator | Velocity from pressure difference | Bernoulli pressure conversion |
| Boundary Layer Calculator | Flat-plate external flow | Laminar/turbulent thickness estimates |
| Box Culvert Calculator | Drainage and culvert sizing | Open-channel hydraulic estimate |
| Shock Wave Calculator | Compressible gas flow | Normal shock relationships |
This hub includes calculators for Pitot tube velocity, siphon flow, pressure drop, boundary layer thickness, Moody chart friction factor, box culvert sizing, shock waves, Strouhal number, and sluice gate flow.
Use the Pressure Drop Calculator for pipe pressure loss. Use the Moody Chart Calculator when you specifically need the friction factor from Reynolds number and pipe roughness.
Reynolds number is a dimensionless value that compares inertial and viscous forces. It is commonly used to classify flow as laminar, transitional, or turbulent.
No. They are educational and estimation tools only. Real hydraulic design requires standards, site data, safety factors, field measurements, and qualified engineering review.
Real systems include fittings, valves, bends, entrance effects, surface roughness changes, turbulence, temperature changes, compressibility, sediment, cavitation, transient flow, and measurement uncertainty.