Fluid Calculator

  • Drip Faucet Water Waste Calculator
    Calculate how much water a dripping faucet wastes per day and per year in liters and gallons from drips per minute and drop volume.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • Young-Laplace Pressure Calculator
    Calculate the Young-Laplace pressure difference across a curved liquid surface from surface tension and one or two principal radii of curvature.

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