Fluid Calculator

  • Buoyant Force Calculator
    Calculate buoyant force from fluid density, displaced volume, and gravity using Archimedes' principle (Fb = ĻgV). Free, instant, with worked example.
  • Buoyancy Calculator
    Calculate buoyant force with Archimedes' principle: Fb = Ļ Ɨ g Ɨ V. Enter fluid density, gravity and displaced volume to get force in newtons.
  • Liters to Pounds Calculator
    Convert liters to pounds for any liquid using density. Enter volume and density (kg/L) to get the weight in pounds instantly.
  • Detention Time Calculator
    Calculate detention (retention) time for tanks and basins from volume and flow rate. Supports gallons, mĀ³, liters and multiple flow units.
  • Hydraulic Retention Time Calculator
    Calculate hydraulic retention time (HRT) from reactor volume and flow rate. Free HRT = V / Q calculator for wastewater and bioreactor design.
  • Differential Pressure Calculator
    Calculate differential pressure (Ī”P) as the difference between upstream and downstream pressure. Supports psi, bar, kPa, Pa, mmHg and inH2O.
  • Hydraulic Conductivity Calculator
    Calculate hydraulic conductivity K from flow rate, sample length, cross-sectional area, and head difference using Darcy's law. Free online tool.
  • Drag Force Calculator
    Calculate aerodynamic drag force using the drag equation Fd = Ā½Ā·ĻĀ·vĀ²Ā·CdĀ·A. Enter fluid density, velocity, drag coefficient and area for instant results.
  • Froude Number Calculator
    Calculate the Froude number (Fr = v/āˆš(gL)) from flow velocity, characteristic length and gravity, and identify subcritical, critical or supercritical flow.
  • Darcy's Law Calculator
    Calculate groundwater volumetric flow rate using Darcy's law: Q = KĀ·AĀ·(dh/dL). Enter hydraulic conductivity, area, head difference and path length.
  • Cv Flow Coefficient Calculator
    Calculate liquid flow rate (GPM) through a valve from its Cv coefficient, pressure drop, and specific gravity using Q = CvĀ·āˆš(Ī”P/SG).
  • Gallons per Square Foot Calculator
    Calculate how many US gallons of water cover an area at a given depth. Enter square feet and depth in inches to get total gallons instantly.
  • Broad-Crested Weir Flow Calculator
    Compute discharge Q over a broad-crested weir from coefficient, crest width, head and gravity using Q = CdĀ·bĀ·āˆšgĀ·(2/3)^(3/2)Ā·H^(3/2).
  • Fire Flow Calculator
    Calculate required fire flow (GPM) using the Iowa and National Fire Academy formulas from building length, width, and percent of area involved.
  • Liters per Minute Calculator
    Calculate flow rate in liters per minute (L/min) from a volume and time. Get instant L/min, L/s and L/h results with this free flow rate calculator.
  • Pond Volume Calculator
    Calculate pond volume in US gallons, liters and cubic feet from length, width and average depth. Free, instant pond water capacity calculator.
  • Pool Volume Calculator
    Calculate your swimming pool volume in US gallons, cubic feet and liters from length, width and average depth. Free, fast and accurate.
  • CFM Calculator
    Calculate required CFM airflow for any room using volume and air changes per hour (ACH). Free ventilation and exhaust fan sizing calculator.
  • PSI to GPM Calculator
    Convert PSI to GPM flow rate. Enter pressure, orifice diameter and discharge coefficient to estimate gallons per minute through an opening.
  • Cylinder Volume in Gallons Calculator
    Calculate the volume of a cylinder in US gallons from its diameter and height in feet. Free tank capacity calculator with the exact formula and example.
  • Tsunami Propagation Speed Calculator
    Calculate tsunami propagation speed from ocean depth using the shallow-water wave formula v = sqrt(g*h). Get results in m/sec and km/h instantly.
  • Cylinder Volume in Liters Calculator
    Calculate the volume of a cylinder in liters from its radius and height in centimeters. Free, instant, and accurate online cylinder volume tool.
  • Bernoulli Equation Calculator
    Free Bernoulli equation calculator. Enter density, velocities and heights at two points to solve for downstream pressure Pā‚‚ in an ideal flow.
  • US Fluid Gallon / Pint / Ounce to Liter Converter
    Convert volume between liters/milliliters and US fluid gallons, pints and fluid ounces in both directions. Uses US (not Imperial/UK) liquid units.

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