Fluid Calculator

  • Pitot Tube Velocity Calculator
    Calculate fluid or airspeed velocity from a pitot tube's differential pressure and density using v = √(2ΔP/ρ). Free, instant results in m/s, km/h, mph.
  • 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.
  • Continuity Equation Flow Rate Calculator
    Solve the continuity equation A₁v₁ = A₂v₂ for fluid velocity and find volumetric flow rate Q = A·v in pipes and ducts instantly.
  • Partially Filled Circle Area Calculator
    Calculate the filled cross-section area and fill percentage of a partially filled circle or cylindrical tank from radius and fill depth.
  • Venturi Flow Rate Calculator
    Calculate volumetric flow rate, throat velocity and areas from a Venturi meter's pressure drop, diameters, fluid density and discharge coefficient.
  • Speed of Sound in Water Calculator
    Calculate the speed of sound in air using a = √(γRT). Enter temperature in °C to get the sonic speed in m/s, km/h, and mph instantly.
  • Hagen-Poiseuille Pressure Drop Calculator
    Calculate the pressure drop of laminar fluid flow through a pipe using the Hagen-Poiseuille equation from viscosity, length, flow rate and diameter.
  • Propane Tank Volume Calculator
    Calculate propane tank water capacity and usable gallons from diameter and length. Capsule-shape volume with adjustable fill percentage (default 80%).
  • Vertical Cylindrical Tank Volume Calculator
    Calculate total and filled volume of a vertical cylindrical tank from diameter, height and liquid level. Get m³, litres and fill percentage instantly.
  • Oval Pool Water Volume Calculator
    Calculate the water volume of an oval or ellipse swimming pool in US gallons, cubic feet and liters from length, width and depth.
  • Water Flow Rate Calculator
    Calculate water flow rate in a pipe from inner diameter and velocity. Get results in m³/s, L/s, L/min, m³/h and US GPM using Q = A × v.
  • Cups to Milliliters Converter
    Convert US cups to milliliters (mL) instantly. Uses the exact factor 1 cup = 236.5882365 mL for accurate cooking and recipe measurements.
  • Ounces to Milliliters Converter
    Convert US fluid ounces to milliliters instantly. 1 fl oz = 29.5735 mL. Free, accurate oz to mL converter for cooking, recipes, and science.
  • Head to Pressure Calculator
    Convert pump head (meters or feet) to pressure in PSI, kPa, bar and Pascals using P = ρgH. Supports any fluid specific gravity.
  • Pump Power / Hydraulic Power Calculator
    Calculate pump shaft power and hydraulic power from flow rate, head, fluid density, gravity and efficiency. Get results in kW and HP instantly.
  • Mass Flow Rate Calculator
    Calculate mass flow rate (ṁ = ρAV) from fluid density, cross-sectional area, and flow velocity. Get kg/s and volumetric flow rate instantly.
  • Pounds to Gallons Calculator (Water)
    Convert pounds of water to US gallons instantly. Enter the weight in pounds and get the volume using the standard 8.34 lb per gallon factor.
  • Fluid Density Calculator
    Calculate fluid density from mass and volume using ρ = m / V. Get results in kg/m³ and g/cm³ instantly with this free density calculator.
  • Manning's Equation Open Channel Flow Calculator
    Calculate open channel flow velocity and discharge with Manning's equation using roughness, area, wetted perimeter, and slope (SI units, m³/s).
  • Capillary Rise Calculator
    Calculate capillary rise height in a thin tube using Jurin's Law from surface tension, contact angle, liquid density, tube radius and gravity.
  • Oval (Stadium) Tank Volume Calculator
    Calculate the volume of an oval (stadium / capsule cross-section) tank from its width, height and length. Get liters, cm³ and US gallons instantly.
  • Round Pool Volume Calculator
    Calculate the water volume of a round (circular) swimming pool in US gallons and cubic feet from its diameter and average depth.
  • Rectangular Pool Gallons Calculator
    Calculate how many gallons of water your rectangular swimming pool holds using length, width, and average depth. Free, instant pool volume calculator.
  • Water Tank Capacity Calculator
    Calculate water tank capacity in liters for rectangular or cylindrical tanks. Enter dimensions in meters to get volume, liters and US gallons instantly.

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