Chemistry Calculators
Free online chemistry calculators for pH, molarity, and more.
pH Calculator
Calculate pH, pOH, and ion concentrations.
Molarity Calculator
Calculate molarity, moles, mass, and volume.
Avogadro Number
Calculate atoms/molecules from moles.
Reconstitution Calc
Volume to reconstitute powder to desired conc.
Water Hardness
Calculate water hardness as CaCO₃ equivalent.
Bond Order
Calculate bond order from MO electron counts.
Zeff Calc
Effective nuclear charge using Slater rules.
% Ionic Character
From electronegativity difference.
Atom Economy
Atom economy of chemical reactions.
Ionic Strength
Ionic strength of a solution.
Q10 Coefficient
Temperature coefficient for reaction rates.
Conc Converter
Convert between %, M, and ppm.
COD Calculator
Chemical oxygen demand from dichromate.
Crude Protein
Protein from Kjeldahl nitrogen content.
Molar Ratio
Molar ratios between reactants/products.
BP at Altitude
Water boiling point at different altitudes.
Activity Coeff γ
Debye-Hückel activity coefficient.
Saponification
Saponification value for soap making.
TDS from EC
Total dissolved solids from conductivity.
Alligation
Mixing ratio for target concentration.
pKa/Ka Converter
Convert between Ka and pKa.
AFR Calculator
Air-fuel ratio from fuel composition.
All Chemistry → 110+
Browse all chemistry calculators.
pH Calculator
Calculate pH, pOH, hydrogen ion concentration, and hydroxide ion concentration
pH
5.000
pOH
9.000
[H⁺]
1.00×10⁻⁵
[OH⁻]
1.00×10⁻⁹
Classification
Acidic
Molarity Calculator
Calculate molarity, moles, mass, and volume of chemical solutions
Result
Mass (g)
14.61
Moles
0.250
Molarity
0.500