Molarity, dilution, osmolarity, and concentration calculators. Browse our free solutions tools below — all calculators are instant, accurate, and require no sign-up.
Alligation Calculator — Calculate mixing ratios and volumes for blending two solutions of different concentrations using the alligation method.
Bleach Dilution Calculator — Calculate how much bleach and water to mix for any target ppm concentration. Covers CDC, WHO, and EPA disinfection guidelines.
Buffer Capacity Calculator — Calculate buffer capacity (β), efficiency, and the amount of acid or base needed to shift pH for any buffer system at a given concentration.
Buffer pH Calculator — Calculate the pH of any buffer solution using the Henderson-Hasselbalch equation. Supports common buffer systems and custom pKa values.
Concentration Calculator — Convert between molarity, g/L, ppm, ppb, and percent concentration. Calculate the mass of solute needed for any solution.
Degree of Unsaturation Calculator — Calculate the degree of unsaturation (DoU / IHD) from a molecular formula. Determine double bonds, triple bonds, and rings.
Dilution Factor Calculator — Calculate dilution factors, volumes, and multi-step dilution protocols. Convert between stock and final concentrations with step-by-step guidance.
Hydrogen Ion Concentration Calculator — Convert between pH, [H⁺], and [OH⁻]. Calculate hydrogen and hydroxide ion concentrations from pH or vice versa.
Mass Percent Calculator — Calculate mass percent (w/w%), mass fraction, and ppm from solute and solution masses or from molarity and density.
Molality Calculator — Calculate molality (mol/kg), convert to molarity, and compute colligative properties like boiling point elevation and freezing point depression.
Normality Calculator — Calculate normality (N), equivalent weight, and milliequivalents. Convert between normality and molarity for acid-base and redox reactions.
Osmotic Pressure Calculator — Calculate osmotic pressure using π = iMRT. Convert between atm, kPa, mmHg, and psi. Determine osmolarity and tonicity for biological solutions.
Percent Solution Calculator — Calculate w/v%, v/v%, and w/w% solution concentrations. Convert between percent types and determine the amount of solute for any target volume.
Protein Solubility Calculator — Estimate protein solubility based on pH, pI, ionic strength, and temperature. Assess precipitation risk and salt effects for protein solutions.
Raoult's Law Calculator — Calculate vapor pressure lowering, partial pressures, and vapor phase composition using Raoult's law for ideal solutions.
Serial Dilution Calculator — Calculate multi-step serial dilution protocols with concentrations, volumes, and visual pipelines. Supports CFU, cells, µg/mL, and molar units.
Solution Dilution Calculator — Use the C₁V₁ = C₂V₂ dilution equation to solve for any unknown. Calculate stock volume, final volume, or concentration for any dilution.
Titration Calculator — Calculate equivalence point volume, pH, and indicator selection for acid-base and redox titrations. Includes titration curve data.