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Nice link Mike. I've been using a chart that I printed out and if my results aren't exact on the ppm scale, I've been doing the math via calculator ([ppm value on Hanna meter] divided by [50] to get the meq/l... then multiply by [2.8] to get dKH). Or, if you want to simplify it, you can just multiply the ppm value by 0.056 to get dKH.
If you want to print out the chart for a quick reference without using the computer (it's good for a quick reference to see if you're in the ballpark)... just print this out: