Sulfur Calculator

Free Sulfur Calculator — find the mass, moles and atom count of sulfur in compounds like S, SO₂, SO₃, H₂S, H₂SO₄, Na₂SO₄ and CaSO₄.

891.9K uses Updated · 2026-05-12 Runs locally · zero upload
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How to Use Sulfur Calculator

  1. Pick a compound — S, SO₂, SO₃, H₂S, H₂SO₄, Na₂SO₄ or CaSO₄.
  2. Enter mass — mg, g or kg.
  3. Read the breakdown — The Sulfur Calculator shows compound moles, sulfur mass, moles, atom count and mass fraction.

Formula & Theory — Sulfur Calculator

n_compound   = m_compound / M_compound
n_sulfur     = n_compound × x_S      # x_S = sulfur atoms in formula
m_sulfur     = n_sulfur × 32.06
N_atoms      = n_sulfur × 6.022e23
sulfur_pct   = m_sulfur / m_compound × 100%
SymbolMeaning
M_compoundMolar mass of the compound (g/mol)
x_SNumber of S atoms per formula unit
6.022e23Avogadro constant (1/mol)

Use Cases for Sulfur Calculator

  • Chemistry homework — Stoichiometry and mass-percent practice.
  • Agriculture — Estimate sulfur in fertilisers like ammonium sulfate or gypsum.
  • Air-quality / environmental — Convert SO₂ emissions to elemental sulfur loads.
  • Laboratory work — Prepare buffered solutions with sulfate salts.
  • Pharma & biotech — Estimate sulfur in cysteine, methionine and sulfated polysaccharides.

The Sulfur Calculator turns any compound mass into clean stoichiometry numbers in seconds.

Frequently asked questions about Sulfur Calculator

How do you calculate the mass of sulfur in a compound?

Multiply the compound mass by the sulfur mass fraction. For example, sulfuric acid (H₂SO₄, 98.08 g/mol) contains 32.06 / 98.08 ≈ 32.7% sulfur by mass.

What is the mass fraction of sulfur in common compounds?

S ≈ 100%, SO₂ ≈ 50.0%, SO₃ ≈ 40.1%, H₂S ≈ 94.1%, H₂SO₄ ≈ 32.7%, Na₂SO₄ ≈ 22.6%, CaSO₄ ≈ 23.5%. The Sulfur Calculator stores these constants automatically.

How many sulfur atoms are in 10 g of SO₂?

10 g of SO₂ contains 10 × 32.06 / 64.06 = 5.00 g of S, which is 0.156 mol or 9.4 × 10²² atoms. The Sulfur Calculator does this in one click.

Why is sulfur important in chemistry and agriculture?

Sulfur is essential for amino acids, fertilisers, vulcanised rubber and many industrial reactions. The Sulfur Calculator is useful for fertiliser dosing and air-quality work.

Is my data stored?

No, all calculations run locally.