I just discovered Google’s calculator today. It’s very clever – type something like (4+5)*2 and press search and it’ll give you the answer. You can also try stuff like 30 litres in uk gallons or 15 kg in slugs.
On an unrelated note, I just gone bought me a new geetar. I don’t have it yet though, because the shop is giving it a proper setup. Despite playing a Taylor in the shop I managed to tear myself away from it and buy a very nice Takamine for a third of the price.
I don’t often like to advertise on here, but if you’re in the market for a new guitar you could do worse than going to Regent Guitars in Leamington. They’re very helpful, and you always get a professional set up on any guitars you buy there.