Chemistry
Molar Mass Calculator
Molar mass of any chemical formula in g/mol, with a full element-by-element breakdown.
M = Σ (atoms of each element × atomic mas…
Also called molecular weight calculator · molar mass of a compound
Science · 9 calculators
Chemistry Calculators
Molar mass from formulas, moles, molarity, molality, dilution, density, pH, percent composition and empirical formulas.
Chemistry
Mole Calculator
Convert between moles, grams and number of particles for any compound.
n = m / M
Also called moles to grams · grams to moles
Chemistry
Molarity Calculator
Molarity (mol/L) from moles or grams of solute and the solution volume — solve for any variable.
M = moles of solute ÷ litres of solution
Also called molar concentration · mol/l calculator
Chemistry
Molality Calculator
Molality (mol of solute per kg of solvent), with the boiling and freezing point shift it causes.
b = moles of solute ÷ kg of solvent
Also called molal concentration · mol/kg calculator
Chemistry
Dilution Calculator
Dilution equation C₁V₁ = C₂V₂ — find the stock volume, final volume or concentration you need.
C₁V₁ = C₂V₂
Also called c1v1 c2v2 · stock solution dilution
Chemistry
Density Calculator
Density, mass or volume (ρ = m/V) — with the result also in g/cm³ and lb/ft³.
ρ = m / V
Also called density formula · mass volume density
Chemistry
pH Calculator
Convert between pH, pOH and hydrogen or hydroxide ion concentration, with the acid/base verdict.
pH = −log₁₀[H⁺]
Also called poh calculator · hydrogen ion concentration
Chemistry
Percent Composition Calculator
Percentage by mass of every element in a compound, with the mass of each in a sample.
% element = (atoms × atomic mass) / molar…
Also called mass percent of element · percentage composition
Chemistry
Empirical Formula Calculator
Find the empirical formula from percent composition or masses, and the molecular formula from molar mass.
Divide each element’s moles by the smalle…
Also called simplest formula · empirical to molecular formula
Key chemistry formulas
| Molar Mass | M = Σ (atoms of each element × atomic mass) |
|---|---|
| Mole | n = m / M · N = n × 6.022 × 10²³ |
| Molarity | M = moles of solute ÷ litres of solution |
| Molality | b = moles of solute ÷ kg of solvent · ΔT = i·K·b |
| Dilution | C₁V₁ = C₂V₂ |
| Density | ρ = m / V |
| pH | pH = −log₁₀[H⁺] · pH + pOH = 14 at 25 °C |
| Percent Composition | % element = (atoms × atomic mass) / molar mass × 100 |
| Empirical Formula | Divide each element’s moles by the smallest, then scale to whole numbers |
Chemistry questions
What is the difference between molar mass and molecular weight?
Numerically they are the same. Molecular weight is a relative, unitless number; molar mass carries the units g/mol.
What is the difference between molarity and molality?
Molarity uses the volume of the whole solution; molality uses the mass of the solvent only, so it does not change with temperature.
What does a pH of 7 mean?
It is neutral at 25 °C — the hydrogen and hydroxide concentrations are equal at 10⁻⁷ mol/L.