TaxPercent... This little useful utility calculates both the Gross price (Tax included, TTC) of a taxable product from its Net price (Before tax, HT) and the Net price from a given Gross price.

You can set the net price and the tax rate, and get the total price, or set the required total price and get the applicable net price - it is just that simple ! I use it whenever I prepare an Invoice for my clients - mainly when we decide on a gross, total price, in advance - and I have to figure out the Net price to go with it.