Fluid Mechanics calculators
46 calculators Buoyancy Calculator Find buoyant force with Archimedes’ principle F = ρVg, plus fluid presets, apparent (immersed) weight, float-or-sink check, fraction submerged and metric or imperial units.
Open Flow Rate Calculator Find volumetric flow rate from area or pipe diameter times velocity, or volume over time. Solve for velocity, add mass flow rate, and estimate pumping cost.
Open Reynolds Number Calculator Compute the Reynolds number from preset fluids or your own values. Use metric or imperial, velocity or pipe flow rate, dynamic or kinematic viscosity, classify flow.
Open API Gravity Calculator Convert between API gravity, specific gravity, and density (kg/m3, g/cm3, lb/gal) instantly. Crude oil classification, product presets, and step-by-step math included.
Open Archimedes' Principle Calculator Calculate buoyant force, apparent weight, and float-or-sink status using Archimedes' principle. Choose metric or imperial units and pick from 8 preset fluids.
Open Bernoulli Equation Calculator Calculate pressure, velocity, flow rate, and hydraulic head at two points in a fluid streamline using the Bernoulli equation. Metric and imperial units.
Open Broad-Crested Weir Calculator Calculate discharge, head, weir length, critical depth, and Froude number for a broad-crested weir. Metric and imperial units, five solve modes, step-by-step working.
Open Coefficient of Discharge Calculator Calculate coefficient of discharge (Cd), actual flow rate, head, or orifice area. Six solve modes, metric/imperial units, edge-type presets, and step-by-step working.
Open Cv Flow Calculator: Valve Flow Coefficient for Liquids and Gases Calculate the Cv valve flow coefficient for liquids and gases. Subcritical and choked gas flow, reverse-solve for flow rate or pressure drop, metric and imperial units.
Open Darcy's Law Calculator Calculate flow rate, hydraulic conductivity, gradient, or area using Darcy's Law. Solve any variable, switch units, and see conductivity ranges for nine soil types.
Open Darcy-Weisbach Calculator Calculate pipe head loss, pressure drop, friction factor, flow velocity, or pipe length with the Darcy-Weisbach equation. Includes Reynolds number and Colebrook-White.
Open Differential Pressure Calculator Calculate differential pressure from two pressures, orifice flow rate, Darcy-Weisbach pipe drop, or filter DP. Includes unit conversion, worked steps, and reference table.
Open Drag Equation Calculator Solve any variable in the drag equation: force, velocity, Cd, area, or density. Six modes, shape presets, unit switches, terminal velocity, and step-by-step workings.
Open Fan Calculator Calculate fan power, airflow (CFM), static pressure and efficiency using the fluid-mechanics fan equations. Includes fan affinity law scaling and BHP output.
Open Friction Factor Calculator (Darcy-Weisbach) Calculate the Darcy friction factor for laminar and turbulent pipe flow using the Colebrook-White equation. Enter pipe diameter, fluid velocity, viscosity and roughness.
Open Friction Loss Calculator Calculate pipe friction loss, pressure drop, and flow velocity using the Hazen-Williams equation. Supports metric and imperial units with 18 pipe materials.
Open Froude Number Calculator Froude number calculator for open channel flow: regime (subcritical, critical, supercritical), critical depth, hydraulic jump sequent depth, and energy dissipation.
Open Hydraulic Conductivity Calculator Calculate hydraulic conductivity (K) via Constant Head, Falling Head, Kozeny-Carman, Hazen, and USBR methods. Step-by-step working in m/s, m/day, cm/s, or ft/day.
Open Hydraulic Gradient Calculator Calculate hydraulic gradient from upstream and downstream head, or solve for head loss, flow path length, or pipe friction using Darcy-Weisbach. Metric and imperial units.
Open Hydraulic Jump Calculator Calculate conjugate depth, head loss, jump length, efficiency and Froude numbers for a hydraulic jump in a rectangular channel. Metric and imperial.
Open Hydraulic Pressure Calculator Calculate hydraulic pressure, force, and area using Pascal's law. Find piston force, system pressure, mechanical advantage, and work done for two-piston systems.
Open Hydraulic Radius Calculator Hydraulic radius calculator for rectangular, trapezoidal, triangular, and pipe sections. Get hydraulic diameter, Manning velocity, and discharge. Metric or imperial.
Open Hydrostatic Pressure Calculator Calculate hydrostatic pressure at any depth. Gauge and absolute pressure, metric and imperial units, 7 fluid presets, reverse-solve for depth or fluid density.
Open Knudsen Number Calculator Calculate the Knudsen number (Kn = lambda/L) with a direct input or kinetic-theory mode. Instant 4-band flow regime: continuum, slip, transition, free-molecular.
Open Lift Coefficient Calculator Calculate lift coefficient (CL) from lift force, wing area, speed, and density. Reverse solve for lift force, angle-of-attack mode, Reynolds number, and L/D ratio.
Open Mach Number Calculator Calculate Mach number from speed and temperature, or solve for velocity or sound speed. Covers subsonic to hypersonic, ISA altitude model, metric and imperial.
Open Magnus Force Calculator Calculate the Magnus force on a spinning ball or cylinder. Enter radius, spin rate, fluid density and velocity to get lift force, spin parameter and lateral deflection.
Open Manometer Calculator Calculate gauge pressure and absolute pressure from a manometer reading. Supports single-column, U-tube single-fluid, U-tube two-fluid, and differential configurations.
Open Oblique Shock Calculator Calculate oblique shock wave angle, downstream Mach number, pressure ratio, density ratio, temperature ratio, and stagnation pressure loss for any supersonic flow.
Open Open Channel Flow Calculator (Manning's Equation) Manning's equation calculator: find flow velocity, discharge, Froude number, and critical depth for rectangular, trapezoidal, triangular, and circular open channels.
Open Orifice Flow Calculator Calculate orifice flow rate, velocity, and area using the Torricelli equation. Metric and imperial units, three solve modes, worked steps, and Cd reference table.
Open Pipe Flow Calculator Calculate pipe flow rate, mean velocity, Reynolds number, Darcy friction factor, and pressure drop in seconds. Metric and imperial units, any pipe material.
Open Pneumatic Cylinder Force Calculator Calculate pneumatic cylinder force for extend and retract strokes. Enter bore, rod diameter, pressure and friction loss to get effective force instantly.
Open Poise to Stokes Converter Convert between poise and stokes (dynamic and kinematic viscosity) using fluid density. Supports cP, Pa*s, cSt, mm2/s and more units. Free, instant, shows all working.
Open Poiseuille's Law Calculator Calculate flow rate, pressure drop, tube radius, length, or viscosity with the Hagen-Poiseuille equation. Reynolds number and flow regime included.
Open Porosity and Permeability Calculator Calculate porosity from void or bulk density, and permeability from Darcy's law or the Kozeny-Carman equation. Shows all steps with standard material ranges.
Open Pounds per Minute Calculator Convert mass flow rate to and from pounds per minute. Enter mass and time, or volume and density, to get lb/min plus 8 other unit conversions instantly.
Open Prandtl-Meyer Expansion Calculator Calculate Prandtl-Meyer expansion fan properties: downstream Mach, pressure ratio, temperature ratio, density ratio, and Mach angles. Three solve modes, any gas.
Open Prandtl Number Calculator: Pr from Viscosity, Heat Capacity and Conductivity Calculate the Prandtl number from dynamic viscosity, specific heat and thermal conductivity. Covers air, water, oils, mercury and custom fluids with worked steps.
Open Refrigerant Capillary Tube Calculator Calculate capillary tube size or refrigerant mass flow rate. Tube resizer (ASHRAE) plus flow analysis with Reynolds number, friction factor, and exit quality.
Open Stokes' Law Calculator Calculate terminal settling velocity, drag force, Reynolds number, and settling time using Stokes' law. Reverse-solve for particle size, density, or viscosity.
Open Water Density Calculator Calculate water density by temperature, salinity, and pressure. Get results in kg/m3, g/cm3, and lb/ft3 with full step-by-step working and a reference table.
Open Water Viscosity Calculator Calculate the dynamic viscosity, kinematic viscosity, and density of liquid water at any temperature, in Celsius, Fahrenheit, or Kelvin, with a chart.
Open Wind Correction Angle Calculator Calculate wind correction angle (WCA), true heading, ground speed, headwind, crosswind, and ETA for any flight leg. Supports knots, mph, and km/h with step-by-step math.
Open Wind Load Calculator Calculate wind pressure and total wind force on buildings in metric or imperial units. Uses the ASCE 7 formula with exposure category, gust factor, and directionality.
Open Y+ Calculator Calculate the y+ wall distance or first cell height for CFD turbulence models. Covers k-epsilon, SST k-omega, Spalart-Allmaras and LES. Metric and imperial units.
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