Calculators
A compact chemical computation suite for formula mass, scientific expressions, gas laws, dilutions and acid-base diagnostics. Pick an instrument, load a preset, inspect the formula and copy a clean result.
Compute M(X) from formula
Type any chemical formula — supports parentheses, hydrates with · or *, charges and subscript counts. Atomic weights from IUPAC 2024.
How this works
count × atomic weight. Optional amount conversion uses n = m / M.
Chemical scientific calculator
Evaluate scientific notation, constants and chemistry-specific helpers such as pH(), HfromPH(), molToParticles() and particlesToMol() with a safe expression parser.
molarMass("H2SO4")
dilution(C1,V1,C2)
percentYield(actual,theoretical)
pH(1e-3)
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History0
Virtual scientific keypad optional tap/click input
Smart examples4
Constants6
Chemistry Function Library12
How this works
eval. Chemistry helpers use accepted constants such as NA, R, F, Kw, c and h.
Convert between chemistry units
Mass, volume, pressure, temperature, energy, amount and concentration — one converter for the lab.
How this works
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.
How this works
PV = nRT, then the result is converted back to the unit selected in the input.
C₁V₁ = C₂V₂
Solve for any of the four variables in a serial dilution. Concentrations in mol/L (molarity); volumes in any consistent unit.
How this works
C₁V₁ equals C₂V₂. Use the same volume unit on both sides.
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.
How this works
Kw = 1.0 × 10⁻¹⁴. The calculator converts the selected input into pH, pOH, [H⁺] and [OH⁻], then classifies the solution.
moles and masses from a balanced reaction
For balancing, limiting reagent, yield and step-by-step stoichiometry, open the Reaction Workbench — the canonical Pro engine.
The public stoichiometry tab no longer runs a separate calculator. Reaction Workbench is the only scientific engine for balancing, stoichiometry, limiting reagent and yield.
How this works
ΔG = ΔH − T·ΔS · q = m·c·ΔT
Gibbs free energy tells you whether a reaction is spontaneous at a given temperature; the heat equation tells you how much energy a mass change of temperature absorbs or releases.
How this works
atomic weights · IUPAC 2024 standard atomic weights · R = 8.314 J·K⁻¹·mol⁻¹ · Kw = 1.0 × 10⁻¹⁴ (25 °C)