Chemistry

  • Buffer Dilution Calculator
    Dilute a concentrated buffer (10X, 5X, 50X) to 1X. Enter final volume and fold to get stock and diluent volumes instantly.
  • Dilution Factor from Volumes Calculator
    Calculate the dilution factor from sample and diluent volumes. DF = (V_sample + V_diluent) / V_sample. Free, instant lab dilution tool.
  • Mass of Solute from Molarity and Volume Calculator
    Calculate the mass of solute needed for a solution from its molarity, volume, and molar mass using m = M x V x MW. Fast and accurate for chemistry.
  • Water Vapor Pressure Calculator
    Calculate the saturation vapor pressure of water at any temperature using the Tetens formula. Get results in kPa, hPa (mbar), and mmHg.
  • mmol/L to mg/dL Calculator
    Convert mmol/L to mg/dL for glucose, cholesterol, creatinine, urea and more. Uses mg/dL = (mmol/L × MW) / 10 with selectable molecular weights.
  • mg/dL to mmol/L Calculator
    Convert mg/dL to mmol/L for glucose, cholesterol, triglycerides or any substance using its molecular weight. Fast, accurate clinical unit converter.
  • IV Drip Rate Calculator (gtt/min)
    Calculate IV drip rate in drops per minute (gtt/min) from volume, infusion time, and drop factor. Free, fast nursing flow-rate tool.
  • Fertilizer PPM Calculator
    Convert grams of fertilizer per gallon or liter into N-P-K ppm. Enter weight, nutrient percentage, and water volume to get parts-per-million instantly.
  • EC to TDS (ppm) Calculator
    Convert electrical conductivity (EC in µS/cm or mS/cm) to TDS in ppm using a 0.5, 0.64, or 0.7 conversion factor. Free, instant water quality tool.
  • OD600 to Cell Density Calculator
    Convert OD600 optical density to cell density (cells/mL) using a conversion factor. Estimate bacterial cell counts for E. coli and other cultures.
  • IV Infusion Rate Calculator
    Calculate IV infusion rate in mL/hr from total volume and time. Also computes drip rate (gtt/min) using a drop factor. Fast, free pump-rate tool.
  • Dose to Volume Calculator
    Convert an ordered medication dose into the volume to administer using stock concentration. Volume = Dose / Concentration. Fast, free dosage tool.
  • Gas Density Calculator
    Calculate the density of an ideal gas from pressure, molar mass, and temperature using ρ = PM/(RT). Free, instant results in kg/m³ and g/L.
  • Fold Dilution Calculator
    Calculate the fold dilution (X-fold) from sample and final volumes. Get the dilution factor and the diluent volume to add for any lab dilution.
  • Concentration from Moles and Volume Calculator
    Calculate molar concentration (molarity, mol/L) from the amount of solute in moles and the solution volume in liters or milliliters. Free and instant.
  • mg/kg Dosage Calculator
    Calculate a weight-based medication dose in mg using the mg/kg formula. Enter dose per kg and body weight (kg or lb) for instant results.
  • Titration Molarity Calculator
    Find an unknown analyte concentration from titration data using Ma·Va·na = Mb·Vb·nb. Enter titrant molarity, volumes and stoichiometry.
  • pH and pOH Relationship Calculator
    Convert between pH and pOH instantly using pH + pOH = 14. Enter a known pH or pOH to find the other plus [H⁺] and [OH⁻] concentrations.
  • Activation Energy Calculator (Two-Temperature)
    Calculate the activation energy (Ea) of a reaction from two rate constants at two temperatures using the two-point Arrhenius equation. Free, instant.
  • ABV Calculator from Specific Gravity
    Calculate alcohol by volume (ABV) from original and final gravity readings. Free homebrew ABV calculator using OG, FG and apparent attenuation.
  • Moles to Volume at STP Calculator
    Convert moles of an ideal gas to volume at STP using V = n × 22.414 L/mol. Fast, accurate chemistry tool with worked examples and formula.
  • Moles to Molecules Calculator
    Convert moles to number of molecules instantly using Avogadro's number (6.022×10²³). Free chemistry calculator with formula and worked example.
  • Grams to Atoms Calculator
    Convert grams to atoms instantly. Enter mass and molar mass to find the number of atoms or molecules using Avogadro's number (6.022 × 10²³).
  • Pool Chlorine Dosage Calculator
    Calculate how much chlorine to add to your pool to reach a target free chlorine ppm. Enter volume, current and target ppm, and product strength.

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