Chemistry
54 free chemistry tools in the Calculators & Converters collection — every one runs in your browser with no signup and no uploads.
Economizer Changeover Temperature & Enthalpy Calculator
Find the dry-bulb and differential-enthalpy changeover points for an air-side economizer
Aquarium CO2 / pH / KH Calculator
Calculate dissolved CO2 from measured pH and carbonate hardness
Dilution Calculator (C₁V₁ = C₂V₂)
Calculate stock solution volumes for any target concentration
Dilution Factor & Back-Calculation Tool
Find dilution factor and original concentration from a diluted sample
D&D Polymorph Stat Block Reference
Quick lookup of CR-appropriate polymorph target stat blocks
Freezing Point Depression Calculator
Calculate delta Tf and osmolality of solutions for formulation
Garden Soil pH Amendment Calculator
Calculate lime or sulfur needed to adjust soil pH to target
Henderson-Hasselbalch Buffer pH Calculator
Calculate buffer pH from pKa and acid/base concentrations
Air Enthalpy Calculator (HVAC)
Moist-air enthalpy in BTU/lb from dry-bulb and wet-bulb or relative humidity
Antibody Dilution Calculator for IHC / ICC
Calculate working dilution volumes for immunohistochemistry antibody solutions
Knots / MPH / km/h / m/s Speed Converter
Convert between nautical, imperial, and metric speed units instantly
Mash pH Estimator
Estimate mash pH from grain bill, water profile, and acid additions
MIC Dilution Series Planner
Plan two-fold dilution series for minimum inhibitory concentration testing
Osmolarity of Solution Calculator
Calculate solution osmolarity from solute concentrations and dissociation
ppm / ppb / % Concentration Converter
Convert between ppm, ppb, mg/L, g/L, and % for solutions
Reagent Preparation & Dilution Planner
Plan a serial dilution series with per-tube transfer and diluent volumes
Serial Dilution Calculator
Calculate concentrations across every step of a serial dilution series
Serum Osmolality & Osmol Gap Calculator
Estimate osmolality and osmol gap to screen for toxic alcohols
Sour Beer Lactic Acid Titration Calculator
Estimate lactic acid additions to reach a target pH in finished sour beer
Acid-Base Titration Calculator
Calculate titre volume, equivalence point, and concentration
Token Dilution & Fully Diluted Valuation Calculator
Calculate FDV, circulating market cap, and dilution from future unlocks
Urine Specific Gravity to Osmolality Converter
Convert urine SG to approximate osmolality for hydration assessment
Wort Dilution & Boil-Off Calculator
Calculate post-dilution or post-boil gravity from volume changes.
Miles per Hour to Knots Converter
Convert mph to kn instantly — 1 mph = 0.868976 kn. Free, browser-only tool.
Percent Yield Calculator
Percent yield from actual and theoretical yield — or solve either.
Molarity Calculator
Solve for molarity, moles, mass or volume — with grams to moles built in.
pH Calculator
Convert between pH, pOH, [H⁺] and [OH⁻], and get pH from strong acid or base concentration.
Dilution Calculator (C1V1 = C2V2)
Solve the dilution equation for any concentration or volume, with units.
Molar Mass Calculator
Molar mass of any chemical formula, with per-element breakdown.
Cocktail Dilution Calculator
Know exactly how much ice water enters your drink — and where your ABV lands.
Titration Calculator
Find analyte concentration, titrant volume or equivalence point from any three knowns.
Ideal Gas Law Calculator (PV = nRT)
Solve for pressure, volume, moles or temperature — with full unit conversion.
Empirical Formula Calculator
Find the empirical and molecular formula from mass percentages or masses.
Enthalpy Calculator
Hess's Law, Gibbs ΔG, bond enthalpies, Kirchhoff, calorimetry — all in one tool.
Entropy & Gibbs Free Energy Calculator
Calculate ΔS, ΔG, Boltzmann entropy and more — six thermodynamic laws in one tool.
Equilibrium Constant Calculator
Kc, ICE tables, van't Hoff and Q vs Kc — all in one tool.
Gibbs Free Energy Calculator
Calculate ΔG, ΔH, ΔS, equilibrium constants and Nernst cell potentials instantly.
Molality Calculator
Calculate molality, solute mass, solvent mass, or molar mass — with full working shown.
pH and pOH Calculator
Convert between pH, pOH, and ion concentrations — with Henderson–Hasselbalch, buffer capacity, and dilution.
PPM Calculator
Convert ppm to molarity, run Beer-Lambert, dilute to a target concentration — all in one place.
Rate of Reaction Calculator
Arrhenius, rate laws, half-lives, activation energy — six chemistry modes in one tool.
Stoichiometry Calculator
Molar mass, limiting reagent, percent yield, molarity and ideal gas law — all in one place.
Atom Economy Calculator
Atom economy, E-factor, PMI, RME and mass balance — green chemistry metrics in one tool.
Freezing-Point Depression Calculator
Calculate ΔTf, molality, Kf, or the van t Hoff factor — with full step-by-step working.
Graham's Law of Effusion Calculator
Compare gas effusion rates using r₁/r₂ = √(M₂/M₁). Solve for rate ratio, individual rate, or unknown molar mass.
Henderson-Hasselbalch Calculator
Solve pH, pKa, [A⁻] or [HA] with full step-by-step working.
Limiting Reagent Calculator
Find the limiting reagent, theoretical yield, excess amounts and percent yield instantly.
Mole Fraction Calculator
Find mole fractions, mole percentages and partial pressures for any gas or liquid mixture.
Normality Calculator
Calculate normality, equivalent weight, molarity conversions, dilutions and titration endpoints.
Osmotic Pressure Calculator (van 't Hoff: π = iMRT)
Solve for osmotic pressure, concentration, temperature or the van 't Hoff factor — with full unit support.
Theoretical Yield Calculator
Find theoretical yield, percent yield, or actual yield — with full stoichiometric working.
Nernst Equation Calculator
Calculate cell potential, standard E°, electrons transferred, reaction quotient or temperature — with full step-by-step working.
Percent Composition Calculator
Find the mass percent of every element in any chemical formula instantly.
Scoville Dilution Calculator
Calculate how much diluent to add to hit your target heat level.