that good calorie calculator

Hi all,
There have been several calorie calculators posted here, and most of them have seemed to read pretty high for me. (That is, it tells me what I should be eating on a given day, and I know that when I eat that much I feel like poo.)

But there was one posted in the last couple months that seemed to read pretty accurately for me, and now I can't find it again, after having tried a search for every combination of calorie / metabolism / calculator I could come up with.

And I've ridden 70 miles this weekend and could stand to see an estimate of what I need to eat. Since "everything in my path" has been my MO so far.

Any insight is much appreciated.

Thanks,
Solveig