PLEASE NOTE: iPhone software update 3.1.2 was causing crashes for some users when entering data on the settings screen. Updating to version 3.1.3 should fix this problem. Thanks for bearing with us.
FREE for a limited time.
The Hrate – Heart Rate Zones Calculator uses your resting and maximum heart rates to generate a series of zones. The body responds distinctively while the heart rate is within each zone. Use Hrate to target a specific heart rate and help you reach your training goals.
Also available bundled in the Hcalc app.