Engineering Fluid Mechanics

Acoustic Flow Meter Calculator

Calculate fluid velocity using acoustic flow meter transit-time method. Free online ultrasonic flow meter calculator for pipes, ducts, and channels.

Aluminum Pipe Pressure Calculator

Calculate the pressure rating of aluminum pipe using Barlow formula. Solve for pressure rating, allowable stress, wall thickness, or outside diameter.

Bernoulli Equation Calculator

Calculate pressure velocity elevation and head loss in fluid flow using Bernoulli equation

Atmospheric Dispersion Calculator

Calculate pollutant concentration using Gaussian plume model, effective stack height, wind speed at elevation, and plume rise for environmental air quality analysis.

Biochemical Oxygen Demand Calculator

Calculate biochemical oxygen demand (BOD) using first-order kinetics, unseeded, and seeded BOD equations. Free online BOD calculator for wastewater treatment and water quality analysis.

Buried Corrugated Pipe Calculator

Calculate design pressure and wall thrust for buried corrugated metal pipes. Combines soil pressure, wheel loading, and vacuum pressure per NRCS guidelines.

Buried Plastic Pipe Calculator

Calculate design pressure, wall thrust, and required wall area for buried plastic pipes (HDPE, PVC) using soil, wheel, and vacuum load components.

Buried Spiral Rib Pipe Calculator

Calculate design pressure and wall thrust for buried spiral rib metal pipes. Combines soil pressure, wheel loading, and vacuum pressure for structural design.

Cavitation Number Calculator

Calculate the cavitation number for fluid flow. Solve for cavitation number, local pressure, vapor pressure, fluid density, or flow velocity using the formula σ = 2(p-pᵥ)/(ρV²).

Chezy Equation Calculator

Calculate open channel flow velocity using the Chezy equation. Solve for velocity, Chezy coefficient, hydraulic radius, or channel slope with v = C√(RhS).

Colebrook Equation Calculator

Calculate the Darcy friction factor for turbulent pipe flow using the Colebrook-White equation.

Continuity Equation Calculator

Calculate volumetric flow rate, cross-sectional area, and flow velocity using the continuity equation Q = A × v for incompressible fluid flow in pipes and ducts.

Cyclone Separator Calculator

Calculate cyclone separator performance including effective turns, cut diameter, radial velocity, pressure drop, and separation factor for industrial air pollution control.

Darcy Weisbach Equation Calculator

Calculate pipe friction head loss using the Darcy-Weisbach equation. Solve for head loss, flow velocity, pipe diameter, length, or friction factor in closed conduit flow.

Darcy's Law Calculator

Calculate groundwater flow using Darcy's Law. Solve for flow rate, hydraulic conductivity, hydraulic gradient, or cross-sectional area in porous media.

Ductile Iron Pipe Calculator

Calculate ductile iron pipe wall thickness, internal pressure, and design parameters using AWWA C150 hoop-stress equations. Free online engineering calculator.

Electrodialysis Calculator

Calculate electrodialysis stack current using Faraday law. Solve for current, flow rate, cell count, and efficiency.

Electrostatic Precipitator Calculator

Calculate ESP collection efficiency using Deutsch-Anderson equation. Solve for efficiency, drift velocity, area, or gas flow rate.

Fluid Pressure Calculator

Calculate fluid pressure at any depth using P = ρgh. Free online hydrostatic pressure calculator with multiple fluid types and unit conversions.

Fourier Number Calculator

Calculate the Fourier number for transient heat conduction analysis. Free online Fourier number calculator with solve for Fo, time, length, or thermal diffusivity.

Hazen Williams Calculator

Calculate water pipe flow using the Hazen-Williams equation. Solve for velocity, flow rate, pipe diameter, roughness coefficient, or hydraulic slope.

Hydraulic Radius Calculator

Calculate hydraulic radius for open channels and pipes using Rh = A/Pw with Froude number, mean depth, and flow classification for fluid mechanics analysis.

Ideal Reactor Calculator

Calculate mean residence time, CSTR step input response, and CSTR pulse input response for ideal continuously stirred tank reactors in chemical and environmental engineering.

Knudsen Number Calculator

Calculate Knudsen number (Kn = λ/L) for gas flow regime determination. Solve for mean free path or characteristic length with instant results.

Lewis Number Calculator

Calculate Lewis number (Le = α/D) for simultaneous heat and mass transfer analysis. Solve for thermal diffusivity or mass diffusivity.

Mach Number Calculator

Calculate the Mach number from velocity and speed of sound. Solve for velocity or speed of sound. Free online Mach number calculator for aerodynamics and aerospace.

Manning Equation Calculator

Calculate open-channel flow velocity using Manning equation. Solve for flow velocity, roughness coefficient, hydraulic radius, or slope. Free online Manning calculator for hydraulic engineering.

CT Disinfection Calculator

Calculate disinfectant concentration, contact time, dilution coefficient, or CT constant for water treatment pathogens.

Monod Kinetics Calculator

Free Monod kinetics calculator finds specific growth rate, substrate concentration, or half-saturation constant. Solve microbial growth equations in browser.

Minor Losses Calculator

Calculate minor head losses, loss coefficients, or flow velocity for pipe fittings and valves. Free tool helps you size piping and estimate pressure drop.

Mixing Design Calculator

Calculate mixing power for static, laminar, turbulent, and pneumatic mixers, and determine impeller Reynolds numbers.

Nusselt Number

Solve for Nusselt number, convection coefficient, length, or thermal conductivity using Nu = hL/k. Convective vs conductive heat transfer.

Oil Recovery Calculator

Calculate the oil recovery factor (ORF) or solve for estimated recoverable oil (ERO) and estimated initial petroleum in place (EIPO) with our online engineering calculator.

Orifice Flow Calculator

Solve for orifice flow rate, discharge coefficient, area, or head. Supports unit conversions.

Parshall Flume Calculator

Determine flow rate, throat width, or upstream depth for Parshall flume open channel flow measurement with automatic unit conversions.

Peclet Number Calculator

Calculate the dimensionless Peclet number for advective and diffusive transport in fluid flows.

Permeameter Calculator

Calculate soil permeability using Darcy law with constant-head permeameter measurements. Solve for hydraulic conductivity, flow rate, area, sample length, or head difference.

Pipe Flow Calculator

Calculate pipe flow Reynolds number and volumetric flow rate. Solve for Re, velocity, diameter, flow rate, or fluid properties for laminar and turbulent flow analysis.

Pipe Hydrostatic Calculator

Calculate external hydrostatic pressure on buried pipes from groundwater. Solve for pressure, water unit weight, or height of water above pipe crown.

Pipe Soil Pressure Calculator

Calculate vertical soil pressure on buried pipes, buoyancy factor for groundwater, and soil load per linear foot using the Marston-Spangler earth pressure method.

Pipe Vacuum Calculator

Calculate vacuum line load on pipe walls using the vacuum load formula Wv = Pv × Di / 12. Solve for vacuum load, vacuum pressure, or inside diameter.

Pipe Wheel Loading Calculator

Calculate wheel load on buried pipes using the Merritt empirical equations for shallow and deep cover regimes.

Plastic Pipe Pressure Class Calculator

Calculate pressure class for plastic pipes using AWWA C900 standards. Solve for PC using HDS, SDR, and SIDR dimension ratios.

Prandtl Number Calculator

Calculate the Prandtl number (Pr), kinematic viscosity, or thermal diffusivity online. Free Prandtl number calculator for fluid mechanics and heat transfer analysis.

Pump Calculator

Calculate pump water horsepower, brake horsepower, efficiency, and NPSH online. Free pump power calculator for engineers.

Schmidt Number Calculator

Calculate the Schmidt number (Sc = ν/D) comparing momentum diffusivity to mass diffusivity. Solve for Schmidt number, kinematic viscosity, or mass diffusivity.

Sherwood Number Calculator

Calculate the Sherwood number (Sh = kL/D) for convective mass transfer analysis. Solve for Sherwood number, mass transfer coefficient, length, or diffusivity.

Reverse Osmosis Calculator

Calculate osmotic pressure using the Van't Hoff equation and membrane rejection rate for RO system design. Free online reverse osmosis calculator.

Reynolds Number Calculator

Calculate Reynolds number for pipe flow and fluid mechanics. Determine if flow is laminar or turbulent with our free online Reynolds number calculator.

Steel Pipe Pressure Calculator

Calculate steel pipe internal pressure, allowable stress, wall thickness, or outside diameter using Barlow's formula.

Stokes Law Calculator

Calculate Stokes law drag force and terminal settling velocity for spheres in viscous fluids. Free online Stokes law calculator for physics and engineering.

Threshold Odor Number Calculator

Calculate Threshold Odor Number TON for water quality testing. Free online TON calculator with dilution ratios and EPA drinking water standards.

Liters Per Minute Calculator

Calculate liters per minute flow rate from volume and time or from pipe cross-section and velocity with unit conversions.

PSI to GPM Calculator

Calculate water flow rate in GPM from tank and exit pressure using pipe diameter and Bernoulli equation.

Volumetric Flow Rate Converter

Convert volumetric flow rate between cubic meters per second, liters per minute, gallons per minute, and more.

Angle of Twist Calculator

Calculate shaft angle of twist from torque, length, polar moment of inertia, and shear modulus for torsion analysis.

Biot Number Calculator

Calculate the Biot number for transient heat conduction from thermal conductivity, convection coefficient, and characteristic length.

Buckling Calculator

Calculate Euler critical buckling load and stress for columns with various end conditions, materials, and geometry. Free browser tool for stability checks.

Broad Crested Weir Calculator

Calculate water discharge rate over a broad-crested weir from crest length, head, and discharge coefficient.

Coefficient of Discharge Calculator

Calculate coefficient of discharge from flow rate, area, and pressure drop for orifice and nozzle flow.

CV Flow Calculator

Calculate liquid flow rate in GPM from valve Cv coefficient, pressure drop, and specific gravity.

Damping Ratio Calculator

Calculate damping ratio and classify systems as underdamped, critically damped, or overdamped.

Differential Pressure Calculator

Calculate differential pressure from upstream and downstream readings for HVAC, piping, and fluid flow diagnostics.

Effectiveness NTU Calculator

Calculate heat exchanger effectiveness and number of transfer units (NTU) for thermal engineering design.

Elongation Calculator

Calculate axial elongation, engineering strain, and stress from force, length, cross-section area, and Young modulus.

Factor of Safety Calculator

Calculate factor of safety from ultimate or yield strength and applied stress for structural engineering design.

Fan Calculator

Calculate fan airflow CFM, static pressure, and fan power for HVAC and ventilation system sizing.

Flow Rate Calculator

Calculate volumetric flow rate from pipe diameter and velocity, or mass flow rate from fluid density using Q = A × v.

Friction Loss Calculator

Calculate Darcy-Weisbach head loss and pressure drop in pipes from flow rate, diameter, length, and friction factor.

Froude Number Calculator

Calculate Froude number for open channel flow from velocity, depth, and gravity to classify subcritical and supercritical flow.

Friction Factor Calculator

Find Darcy friction factor from Reynolds number and relative roughness using Swamee-Jain and laminar flow formulas. Get fast, free results in your browser.

Hoop Stress Calculator

Calculate hoop stress, wall thickness, internal pressure, or diameter for thin-walled pressure vessels and pipes.

Heat Transfer Calculator

Calculate heat transfer rate through conduction using thermal conductivity, area, temperature difference, and thickness.

Heat Transfer Coefficient Calculator

Calculate convective heat transfer coefficient from heat flux, surface area, and temperature difference.

Hydraulic Conductivity Calculator

Calculate soil hydraulic conductivity using Kozeny-Carman, Darcy's law, constant head, and falling head permeameter methods. Free online tool, no signup.

Hydraulic Gradient Calculator

Calculate hydraulic gradient, head loss per unit length, and energy grade line slope for open channel and pipe flow.

Hydraulic Jump Calculator

Calculate hydraulic jump sequent depths, Froude number, and energy loss in open channel flow.

Hydraulic Pressure Calculator

Calculate hydraulic force from fluid pressure and wetted area for dams, gates, and pipe fittings.

Hydrostatic Pressure Calculator

Calculate hydrostatic pressure at depth in a fluid using density, gravity, and depth with unit conversion.

Isentropic Flow Calculator

Calculate pressure, temperature, and density ratios for isentropic compressible flow.

LMTD Calculator

Calculate log mean temperature difference for counterflow and parallel flow heat exchangers.

Manometer Calculator

Calculate gauge pressure from manometer fluid height, density, and gravity for U-tube and inclined manometers. Get fast, accurate results free in your browser.

Mixed Air Calculator

Calculate mixed air properties from two air streams including mass flow rate and humidity ratio mixing.

Mixed Air Temperature Calculator

Calculate resulting temperature when mixing two air streams at different temperatures and flow rates.

Mohr Circle Calculator

Calculate principal stresses and maximum shear stress from normal and shear stress components using Mohr circle.

NPSH Calculator

Calculate net positive suction head for centrifugal pumps using atmospheric pressure, vapor pressure, and suction losses.

Oblique Shock Calculator

Calculate oblique shock wave properties including downstream Mach number, pressure ratio, and deflection angle.

Open Channel Flow Calculator

Calculate open channel flow velocity and discharge with Manning's equation. Enter channel geometry, slope, and roughness to get instant results in your browser.

Performance Coefficient Calculator

Calculate pump or turbine performance coefficient from flow rate, head, power, and fluid density with step-by-step formulas. Free, browser-based, no signup.

Pipe Velocity Calculator

Calculate fluid velocity in a pipe from volumetric flow rate and diameter, with unit conversion and step-by-step math. Get instant results, free, no signup.

Pneumatic Cylinder Force Calculator

Calculate pneumatic cylinder push and pull force from bore diameter, pressure, and rod diameter with step-by-step formulas.

Prandtl Meyer Expansion Calculator

Calculate Prandtl-Meyer function and expansion angle for supersonic flow from Mach number with step-by-step compressible flow formulas.

Porosity and Permeability Calculator

Calculate porosity from void and bulk volume, then estimate permeability using Darcy's law. This free browser tool gives step-by-step geology formulas quickly.

Pounds Per Minute Calculator

Convert mass flow rate between pounds per minute, kilograms per second, and other units with step-by-step conversion formulas.

Poiseuilles Law Calculator

Calculate volumetric flow rate through a pipe using Poiseuilles law from pressure drop, radius, length, and dynamic viscosity.

Psychrometric Calculator

Calculate psychrometric properties of moist air including humidity ratio, dew point, enthalpy, and specific volume from dry-bulb and wet-bulb temperatures.

Refrigerant Capillary Tube Calculator

Calculate refrigerant capillary tube length and diameter for refrigeration systems based on flow rate, pressure drop, and refrigerant type.

SCFM Calculator

Convert between SCFM and ACFM using actual pressure and temperature with standard 14.7 psia and 68°F.

Section Modulus Calculator

Calculate section modulus for rectangular, circular, and I-beam cross sections in mm³.

Sensible Heat Calculator

Calculate sensible heat transfer from mass, specific heat capacity, and temperature change.

Shaft Size Calculator

Calculate minimum solid circular shaft diameter from torque, allowable shear stress, and safety factor.

Slenderness Ratio Calculator

Calculate slenderness ratio from column length and radius of gyration to assess buckling risk for structural members.

Stress Concentration Factor Calculator

Calculate stress concentration factors for notches, holes, and fillets using geometry ratios and nominal stress.

Thermal Resistance Calculator

Calculate thermal resistance for single layers and series composite walls using R = L/(kA).

Valve Flow Coefficient

Calculate valve flow coefficient Cv from flow rate, pressure drop, and specific gravity for fluid control valves.

Water Pressure at Depth Calculator

Calculate hydrostatic water pressure at depth using P = P_atm + ρgh with fresh or salt water and m/ft depth units.

Wind Load Calculator

Calculate wind pressure and force on structures from wind speed, area, and drag coefficient.

Y Plus Calculator

Calculate dimensionless wall distance y+ for CFD meshing from friction velocity, viscosity, and wall distance. Get fast, free results in your browser.

Activated Sludge SVI Calculator

Calculate sludge volume index (SVI) for activated sludge processes in wastewater treatment operations.