Basically, $2/1000 gallons of water & $0.10/kWh for electricity (I did not bother calculating for gas dryers) were the most recent US averages I could find, and that was rounding up (e.g., electricity was actually > $0.09 but < $0.10).

I used this calculator[2], and plugged in appropriate values where I could find most current data.

[1] https://news.ycombinator.com/item?id=6107020 [2] http://michaelbluejay.com/electricity/laundry.html

Even with lowball estimates, my cost for washing is double yours - 30+c/kWh... sigh.