Enter the atomic symbols and percentage masses for each of the elements present and press "calculate" to work out the empirical formula.

If the data does not fit to a simple formula, the program will attempt to generate possible empirical formulae and will indicate how well these fit the percentage composition using the variance.

If the percentage for one (and only one) element is left out, the program will assume that this element represents the remainder of the mass.

element: percentage of mass: