Calculators
Four precision instruments wired to the periodic table. Type a chemical formula, plug values into PV=nRT, or compute pH from a hydrogen ion concentration — every result rounded to 4 significant figures.
Compute M(X) from formula
Type any chemical formula — supports parentheses, hydrates with · or *, charges and subscript counts. Atomic weights from IUPAC 2024.
PV = nRT — solve any variable
Provide any three of {P, V, n, T} and we solve for the fourth. R is fixed at 8.314 J·K⁻¹·mol⁻¹. Temperature input is converted to Kelvin automatically.
C₁V₁ = C₂V₂
Solve for any of the four variables in a serial dilution. Concentrations in mol/L (molarity); volumes in any consistent unit.
pH · pOH from [H⁺] or [OH⁻]
Computes pH, pOH, [H⁺] and [OH⁻] from any one input at 25 °C (Kw = 1.0 × 10⁻¹⁴). Marks the solution as acidic, neutral or basic.
atomic weights · IUPAC 2024 standard atomic weights · R = 8.314 J·K⁻¹·mol⁻¹ · Kw = 1.0 × 10⁻¹⁴ (25 °C)