Mapmyride.com's calculator allows you to enter any weight, IIRC. Also allows you to map, see elevation, etc., before riding the route. I tend not to worry about those calculators too much. I don't think any of them are that accurate. Besides, I'm not necessarily interested in how many calories I burn, but rather in:

1. Getting to work;
2. Generally getting a some exercise and being more fit; and
3. Losing weight and inches.

In that order.

If I'm doing all three of those things, the actual number of calories I'm burning is trivial.

Good luck with the commute, though, and congrats! I think the wipes will do ya fine. Before you know it, you'll commute 5 days a week and look for a longer route, at least on the way home where a shower awaits. It's a slippery slope