Fluid Calculator

  • Hydrostatic Pressure Calculator
    Calculate hydrostatic (fluid) pressure with P = ρgh. Get gauge and absolute pressure in Pa, kPa, bar and atm from density, gravity and depth.
  • Water Hammer Pressure Surge Calculator
    Calculate water hammer pressure surge with the Joukowsky equation. Enter fluid density, pressure wave speed and velocity change to get the surge in Pa, kPa, bar and psi.
  • Hydraulic Press Force Calculator
    Calculate hydraulic press output force using Pascal's law. Enter input force and both piston areas to find F2 = F1 × (A2/A1) plus system pressure.
  • Continuity Equation Flow Rate Calculator
    Calculate volumetric flow rate Q = A·v and downstream velocity using the continuity equation A₁v₁ = A₂v₂ for circular pipes. Free and instant.
  • Pipe Flow Velocity Calculator
    Calculate fluid velocity in a pipe from flow rate and inner diameter using v = Q / (π/4 × D²). Free, instant pipe flow speed calculator.
  • 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.
  • Bucket Volume Calculator
    Calculate the volume of a tapered bucket from its top diameter, bottom diameter and height. Get results in liters, US gallons and UK gallons instantly.
  • Hot Tub Volume Calculator
    Calculate how many gallons of water your hot tub holds. Enter the shape and dimensions to estimate volume in gallons, liters and cubic feet.
  • Horizontal Cylindrical Tank Volume Calculator
    Calculate the liquid volume in a horizontal cylindrical tank for any fill height. Get partial-fill volume, fill %, liters and US gallons instantly.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.

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