Fluid Calculator

  • Pipe Cross-Sectional Area Calculator
    Calculate the internal cross-sectional area of a pipe from its inside diameter using A = πD²/4. Supports mm, cm, inches and meters.
  • Tap Water Cost Calculator
    Calculate the cost of tap water from the volume used and your price per liter. Estimate water bills, showers, baths, gardens and more instantly.
  • Friction Calculator
    Compute friction force from normal force and coefficient of friction. Enter normal force (N) and coefficient (μ) to get F = μN instantly in newtons.
  • Dynamic Pressure Calculator
    Calculate dynamic pressure q = ½ρv² from fluid density and flow velocity. Get instant results in pascals and kilopascals for aerodynamics and fluid flow.
  • Volumetric Flow Rate Calculator
    Calculate volumetric flow rate Q from cross-sectional area A and flow velocity v using Q = A·v. Get results in m³/s, L/min and GPM instantly.
  • Torricelli's Law Calculator
    Calculate the efflux velocity of fluid escaping a hole using Torricelli's Law, v = √(2gh). Enter fluid height and gravity to get speed in m/s.
  • Darcy-Weisbach Head Loss Calculator
    Calculate pipe friction head loss with the Darcy-Weisbach equation: h_f = f·(L/D)·(v²/2g). Enter friction factor, length, diameter and velocity.
  • Flow Continuity Equation Calculator
    Solve the fluid continuity equation A1·v1 = A2·v2. Enter inlet area, inlet velocity, and outlet area to find outlet velocity and volumetric flow rate.
  • Total Head (Bernoulli) Calculator
    Compute total hydraulic head H = z + P/ρg + v²/2g from elevation, pressure, velocity and fluid density using the Bernoulli equation. Free engineering tool.
  • Laminar Friction Factor Calculator (f = 64/Re)
    Calculate the Darcy friction factor for laminar pipe flow using f = 64/Re. Enter the Reynolds number to get the dimensionless friction factor instantly.
  • Volumetric to Mass Flow Rate Calculator
    Convert volumetric flow rate to mass flow rate using ṁ = ρQ. Enter fluid density and volume flow to get mass flow in kg/s, kg/min and kg/h.
  • Shear Stress Calculator (Newton Law of Viscosity)
    Calculate shear stress in a Newtonian fluid from dynamic viscosity and velocity gradient using τ = μ·(du/dy). Free physics calculator with worked example.
  • Hydraulic Power Calculator
    Calculate hydraulic (fluid) power from flow rate and pressure with P = Q × ΔP. Get kW, watts and the input power needed at a given pump efficiency.
  • Terminal Velocity (Newton Regime) Calculator
    Calculate terminal settling velocity in the Newton (turbulent) regime from mass, gravity, fluid density, frontal area and drag coefficient.
  • Oxygen Tank Duration Calculator
    Estimate how long an oxygen tank will last from gauge pressure, cylinder tank factor, and flow rate (L/min). Quick remaining-time calculator.
  • Water Horsepower Calculator
    Calculate water horsepower (WHP) from flow rate, total head, and specific gravity using WHP = (Q·H·SG)/3960. Free pump hydraulic power tool.
  • Water Weight Calculator
    Calculate the weight of water from any volume. Convert gallons, liters, mL or fluid ounces into pounds, kilograms, grams and ounces instantly.
  • Kinematic Viscosity Unit Conversion Calculator
    Convert kinematic viscosity between m2/s, Stokes, centistokes, in2/s and ft2/s instantly. Enter one value and see all common units at once.
  • V-Notch Weir Flow Calculator
    Calculate discharge over a triangular (V-notch) weir from head, notch angle, and discharge coefficient using the standard weir equation.
  • Rectangular Weir Discharge Calculator
    Calculate discharge (flow rate) over a rectangular weir from crest width, head and discharge coefficient using Q = (2/3)·Cd·L·√(2g)·H^1.5.
  • Dynamic Viscosity Unit Conversion Calculator
    Convert dynamic (absolute) viscosity between Pa.s, mPa.s, poise, centipoise, kgf.s/cm2, lbf.s/ft2 and more. Instant all-unit conversion.
  • GPM to Pipe Velocity Calculator
    Convert flow rate (GPM) and pipe inside diameter to water velocity in ft/s. Uses v = 0.4085 × GPM ÷ d² for fast, accurate pipe sizing.
  • Colebrook-White Friction Factor Calculator
    Solve the implicit Colebrook-White equation for the Darcy friction factor f from Reynolds number, pipe roughness and diameter. Free engineering tool.
  • Evaporation Rate Calculator
    Calculate water evaporation rate from a free surface using gₕ = Θ·A·(xₛ − x). Enter the evaporation coefficient, area and humidity ratios.

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