Empowered Boost How do you calculate your coronary heart fee? An smooth components for figuring out your most coronary heart rate works by sincerely subtracting your age from 220. If you’re forty years old, for instance, your maximum coronary heart rate is a hundred and eighty beats per minute (220-forty). To teach at 70% of your most coronary heart price, genuinely multiply one hundred eighty via 70 and divide by way of one hundred, which equals 126 beats consistent with minute.