There are hundreds of online calculators ranging from javascript, flash and java calculators. Many of them provide an astounding array of functionalities. However when I needed a simple calculator, which allows me to enter numbers by hand in multiple lines ( often with one line per number as is normal in accounting) with support for grouping using brackets etc., I could find none. So I created one. Additionally it displays results immediately as you type, forgiving of your errors and in general treats you nicely even if you type rubbish. Precedence of operators are as follows - Bracket > Division > Multiplication > Modulus > Addition > Subtraction. Greater than sign is used to indicate precendence. So brackets are of highest precedence. Without further ado I present to you a simple online calculator for your numerical / financial / accounting needs; nothing fancy.