There is a good Heart Rate calculator at Sally Edwards
web site
HEARTZONES
The basic formula that she uses for Max Heart rate is:
(210 - 1/2 your age) (- 5% of bodyweight) (+4 for men).
I used all 4 of the suggested methods for finding Max heart
rate and this was within 2 BPM of all of em.
It is a little conservative but a whole lot closer than the
old 210 - age formula.
I'm very impressed with the HRM book for Indoor and
outdoor cyclists. Has some Very good workouts.
Marty