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.
  • Tap Water Cost Calculator
    Calculate the cost of tap water from the volume used and your price per liter. Estimate water bills, showers, baths, gardens and more instantly.
  • 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.
  • Gallon Calculator
    Convert a rectangular tank's dimensions (length, width, height in inches) into US gallons. Free volume calculator with cubic inches and liters output.
  • CFM Calculator
    Calculate required CFM airflow for any room using volume and air changes per hour (ACH). Free ventilation and exhaust fan sizing 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.
  • 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.
  • 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.
  • 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.
  • Detention Time Calculator
    Calculate detention (retention) time for tanks and basins from volume and flow rate. Supports gallons, m³, liters and multiple flow units.
  • 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.
  • 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.
  • Viscosity Index Calculator
    Calculate Viscosity Index easily with kinematic viscosity values at 40°C and 100°C. Determine oil performance and viscosity-temperature relationship for efficient lubricant analysis and selection.
  • Friction Calculator
    Compute friction force from normal force and coefficient of friction. Enter normal force (N) and coefficient (μ) to get F = μN instantly in newtons.
  • Gas Line Calculator
    Enter total BTU, pipe length (feet), and pressure (inches water column) to get the recommended gas pipe size and estimated flow rate.

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