Calculate your 5 training heart rate zones for effective workouts
Heart rate zones are estimates based on age-predicted max heart rate. Actual max HR varies between individuals. For the most accurate zones, consider a supervised maximal exercise test. Consult your GP before starting a new exercise programme.
Heart rate zone training is one of the most effective ways to structure your cardiovascular workouts for specific goals, whether that is burning fat, building aerobic endurance, improving race performance, or pushing your maximum capacity. By monitoring your heart rate during exercise and keeping it within a specific zone, you can ensure that your body is working at the right intensity to achieve the adaptation you are after. The British Heart Foundation and the American Heart Association both recognise heart rate monitoring as a valuable tool for safe and effective exercise. Your heart rate training zones are personalised ranges of heartbeats per minute (bpm) that correspond to different exercise intensities, from gentle recovery efforts to all-out maximum exertion. There are five standard zones, each targeting different physiological systems. Zone 1 (50-60% intensity) is for active recovery and warm-ups. Zone 2 (60-70%) is the fat-burning zone ideal for building base aerobic fitness -- this is where most of your easy runs and long rides should fall. Zone 3 (70-80%) develops aerobic capacity and is typical of steady-state tempo work. Zone 4 (80-90%) pushes into the lactate threshold zone, improving your ability to sustain hard efforts. Zone 5 (90-100%) is maximum effort, used sparingly for short intervals to develop peak power and speed. This calculator computes your five heart rate zones using two methods. The Karvonen method (heart rate reserve) is considered more accurate because it accounts for your resting heart rate, which reflects your cardiovascular fitness level. A fitter person with a lower resting heart rate will have different zone boundaries than a less fit person of the same age. The simpler percentage-of-max method uses only your age-predicted maximum heart rate and is a reasonable starting point if you do not know your resting heart rate. Both methods use the standard formula of 220 minus age to estimate maximum heart rate, which is a well-established approximation used by fitness professionals worldwide.
To calculate your heart rate training zones: 1. Enter your age. This is used to estimate your maximum heart rate using the standard formula (220 minus age). While individual max HR can vary, this formula provides a reliable estimate for most adults. 2. Enter your resting heart rate. Measure this first thing in the morning before getting out of bed. Place two fingers on your wrist or neck and count the beats for 60 seconds, or use a fitness tracker. The British Heart Foundation recommends averaging several morning readings for accuracy. A typical resting heart rate for adults is 60-100 bpm, with fitter individuals often in the 40-60 bpm range. 3. Choose your calculation method. The Karvonen method (recommended) uses your heart rate reserve (max HR minus resting HR) and produces more personalised zones that reflect your fitness level. The simple percentage method uses only your max HR and is useful as a quick reference. 4. Review your zones. The calculator displays your estimated maximum heart rate and the lower and upper bounds of each of the five training zones. The bar chart shows the range of each zone for easy visualisation. 5. Apply your zones to training. Use Zone 2 for most of your training (the 80/20 rule suggests 80% easy, 20% hard). Use Zones 4-5 for interval sessions and race-specific work. Most running and cycling coaches recommend spending the majority of training time in Zones 1-2 to build a strong aerobic base.
The heart rate zones calculator uses two methods to compute training zones from your maximum heart rate. Maximum heart rate (max HR) = 220 - age For example, a 30-year-old has an estimated max HR of 190 bpm. Method 1: Karvonen formula (heart rate reserve) Heart rate reserve (HRR) = max HR - resting HR Target HR = (HRR x intensity percentage) + resting HR For a 30-year-old with a resting HR of 65 bpm: HRR = 190 - 65 = 125 bpm Zone 1 low (50%): (125 x 0.50) + 65 = 128 bpm Zone 1 high (60%): (125 x 0.60) + 65 = 140 bpm Zone 2 low (60%): (125 x 0.60) + 65 = 140 bpm Zone 2 high (70%): (125 x 0.70) + 65 = 153 bpm Zone 3: 153-165 bpm, Zone 4: 165-178 bpm, Zone 5: 178-190 bpm Method 2: Simple percentage Target HR = max HR x intensity percentage Zone 1 low (50%): 190 x 0.50 = 95 bpm Zone 1 high (60%): 190 x 0.60 = 114 bpm The Karvonen method produces higher zone boundaries because it accounts for your resting heart rate, making the zones more relevant to your actual effort levels during exercise. For someone with a low resting heart rate (indicating good fitness), the difference between the two methods is more pronounced.
The 220-minus-age formula is an estimate and can be inaccurate by 10-20 bpm for some individuals. If you want to know your true max HR, a supervised maximal exercise test (typically on a treadmill or cycle ergometer) conducted at a sports medicine clinic or hospital is the gold standard. Many fitness watches and chest strap monitors can also help estimate max HR during very hard interval sessions, though this should only be attempted by healthy, trained individuals. If you are over 40, have cardiovascular risk factors, or have been inactive for an extended period, the NHS recommends consulting your GP before starting vigorous exercise.