BriggsJC wrote:dictionaries were of no help with 低カロリー
If you don't know the pronunciation of a word and it's not in a J-E dictionary, you can usually get your IME to tell you.
For me, with Japanese keyboard on Mac OS X, I just copy the word from my browser into a new text document, select the entire word with my mouse, and double-click the kana button.
Then 低カロリー is instantly back-converted to kana: ていかろりー. It works with almost all modern Japanese words, as well as some very old/rare ones. (For example, it even properly back-converts the son of Prince Shotoku, Yamashiro no Oe-no-o 山背大兄王 to kana: やましろのおおえのおう. He's a relatively obscure historical character who died hundreds of years ago.)
I don't know how this works on non-Japanese keyboards or Windows boxes, but I imagine this facility exists.