Fluid Calculator

  • Froude Number Calculator
    Calculate the Froude number (Fr = v/√(gL)) from flow velocity, characteristic length and gravity, and identify subcritical, critical or supercritical flow.
  • Bernoulli Equation Calculator
    Free Bernoulli equation calculator. Enter density, velocities and heights at two points to solve for downstream pressure P₂ in an ideal flow.
  • Cv Flow Coefficient Calculator
    Calculate liquid flow rate (GPM) through a valve from its Cv coefficient, pressure drop, and specific gravity using Q = Cv·√(ΔP/SG).
  • Archimedes' Principle Calculator
    Calculate buoyant force with Archimedes' principle: Fb = ρ·g·V. Enter fluid density, gravity, and displaced volume to get the upward force in newtons.
  • Buoyancy Calculator
    Calculate buoyant force with Archimedes' principle: Fb = ρ × g × V. Enter fluid density, gravity and displaced volume to get force in newtons.
  • 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.
  • 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.
  • 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.
  • 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.
  • Pediatric Epinephrine Dose Calculator
    Calculate pediatric IM epinephrine dose for anaphylaxis: 0.01 mg/kg (max 0.5 mg) and the volume to draw up by concentration. Educational tool.
  • Paracetamol (Acetaminophen) Pediatric Dosage Calculator
    Estimate a child's paracetamol/acetaminophen dose by weight. Get the mg per dose and the mL of liquid for common concentrations. Educational only.
  • Ibuprofen Pediatric Dosage Calculator
    Estimate a child's ibuprofen dose (mg) and liquid volume (mL) by weight. US weight-based pediatric dosing guide. Educational use only.
  • Pediatric Weight-Based Dose Calculator
    Calculate pediatric medication dose by body weight (mg/kg) and the liquid volume to give based on concentration. Educational tool — verify with a clinician.
  • Drops Per Minute Calculator
    Calculate IV drip rate in drops per minute (gtt/min) from infusion volume, time, and drop factor. Free, instant macrodrip and microdrip calculator.
  • Pressure Unit Conversion Calculator
    Convert pressure between 15 units (Pa, kPa, MPa, bar, atm, psi, mmHg, inHg, Torr, mmH2O). Shows both absolute and gauge pressure for each unit.
  • Dog Raisin Toxicity Calculator
    Estimate your dog's grape or raisin toxicity risk from amount eaten and body weight. Uses conservative toxic-dose thresholds. Not a substitute for a vet.
  • Dog Onion Toxicity Calculator
    Estimate whether the amount of onion your dog ate is potentially toxic. Uses the ~0.5% body weight threshold to gauge onion poisoning risk.
  • Cell Dilution Calculator
    Cell dilution calculator using C1V1 = C2V2. Find the stock cell volume and diluent needed to reach a target final concentration and volume.
  • Maintenance Fluids Calculator (Holliday-Segar)
    Calculate maintenance IV fluid rate with the Holliday-Segar 4-2-1 rule: 4 mL/kg/h for first 10 kg, 2 for next 10 kg, 1 per kg above 20.
  • Alcohol Dilution Calculator
    Calculate how much water to add to dilute a spirit or alcohol to a lower target ABV. Enter initial volume, current ABV and target ABV.
  • Coffee Ratio Calculator
    Calculate how much water you need from your coffee dose and brew ratio. Enter grams of coffee and a ratio like 1:15 for the perfect cup.
  • Cold Brew Ratio Calculator
    Calculate how many grams of ground coffee you need for cold brew based on water volume and your coffee-to-water ratio (typical 1:8).
  • Coffee to Water Ratio Calculator
    Calculate the perfect coffee-to-water ratio. Enter your coffee or water amount and brew ratio to get the other measurement in grams.
  • Water Demand Calculator
    Estimate total daily water demand from population and per capita usage. Get results in L/day, m³/day, L/s and annual m³ for water supply planning.

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