Molecular Weight Calc 4.6

the author of this app says:

Molecular Weight Calc is an easy to use program to calculate the mass of a molecular formula. Features: allows lowercase or uppercase input; Simple, convenient interface; can look up any element by its symbol (convenient when you forget what element number Ta is); supports copying and pasting; accurate to 3 decimal places, marks errors in your input for easy correction. Perfect for any Chemistry related profession.