Heart Rate Zones Explained (With Chart)
Training intensity is easier to manage with numbers than with feel. Here is how heart rate zones work and how to set yours.
Why Zones Are Useful
Perceived effort is unreliable, particularly during intervals or when you are tired. Heart rate gives an objective anchor. Each zone corresponds to a different physiological state and a different training adaptation, so knowing which zone you are in lets you train deliberately rather than accumulating moderate-effort sessions that are too hard to recover from and too easy to drive improvement. Zones are estimates rather than exact boundaries, but they are far more useful than no reference point.
The Five Zones
Most models use five zones expressed as percentages of maximum heart rate. Zone 1 (50 to 60 percent) is recovery: easy movement, warm-ups, and cool-downs. Zone 2 (60 to 70 percent) is the conversational pace where the body relies heavily on fat oxidation and which builds aerobic base. Zone 3 (70 to 80 percent) is moderate effort that develops cardiovascular endurance. Zone 4 (80 to 90 percent) is hard, improving speed and lactate threshold. Zone 5 (90 to 100 percent) is all-out effort sustainable only briefly.
Estimating Your Maximum Heart Rate
The most familiar estimate is 220 minus your age. It is simple but has a wide margin of error -- individual values can differ by 10 to 15 beats per minute. A more recent formula, 208 minus 0.7 times age (the Tanaka equation), tends to be slightly more accurate for older adults. The only precise way to know your maximum is a supervised exercise test, which is not necessary for general training. Our Target Heart Rate Calculator shows both estimates side by side.
Using Zones in Practice
A common and effective distribution is to keep most training easy -- Zones 1 and 2 -- and reserve a smaller share for hard work in Zones 4 and 5. This polarised approach reflects how endurance athletes actually train. For general health, the WHO recommends 150 to 300 minutes of moderate activity or 75 to 150 minutes of vigorous activity per week, which maps onto Zones 2 to 3 for moderate and Zone 4 for vigorous. Wrist-based optical monitors are convenient but can lag during rapid changes; a chest strap is more responsive.
Getting Started
Calculate your zones, then spend a few sessions simply observing which zone you naturally settle into. Most people discover they train harder than intended on easy days and easier than intended on hard days. Our Pace Calculator can help you pair intensity with distance for running and walking.