http://www.healthchecksystems.com/heart.asp

http://www.healthstatus.com/calculate/thr

http://health.discovery.com/tools/ca...s/hrc/hrc.html



Here are a few sites that offer a target HR calculator. They each gave me a slightly different answer, but for my age (nearly 41), my MAX (not target, but MAX) is supposed to be around 179 bpm. Target HR is supposed to be between 60% and 80% of Max, which for me is in the 150's.

I don't know how old you are, but 180 sounds a bit high. Are you sure you're not confusing target range with Max Heart rate????