Your Five Heart Rate Zones
Age gives an estimated maximum. Your resting rate makes the zones yours. A measured maximum beats both.
Your Zones
| Zone | Name | % of reserve | Beats per minute |
|---|
Heart rate lags effort by a minute or two and drifts upward in heat and late in a long ride, so hold a zone by feel for the first minutes of an interval and let the number confirm it. Age formulas can miss your true maximum by 10 beats or more; a measured maximum fixes that.
How It Works
Two formulas: one for the ceiling, one for dividing the space between resting and maximum.
The Formulas
Maximum heart rate (estimated) = 208 - 0.7 x age (Tanaka, 2001) Heart rate reserve = maximum - resting Zone heart rate = resting + reserve x zone % (Karvonen method) Zone 1: 50 to 60% Zone 2: 60 to 70% Zone 3: 70 to 80% Zone 4: 80 to 90% Zone 5: 90 to 100% Without a resting rate: zone heart rate = maximum x zone %Why the Reserve Method
Two riders can share a maximum of 180 and have resting rates of 45 and 70. Percent-of-maximum zones give them the same numbers; the Karvonen method does not, because it divides the range each rider actually has. The fitter rider, with the bigger reserve, gets a Zone 2 that starts higher and that matches what a lab test would show. That is why the calculator asks for a resting rate and falls back to percent of maximum only when you leave it blank.
Why Tanaka, Not 220 Minus Age
The 220 minus age rule was never derived from a study; it was a rough line drawn through a handful of data points in the 1970s. Tanaka, Monahan, and Seals analyzed 351 studies covering 18,712 people in 2001 and fitted 208 minus 0.7 times age, which lands closer to measured maximums, especially past 40. A 60-year-old gets 166 under Tanaka and 160 under the old rule, a difference that moves every zone by about 5 beats. Both are averages: individuals vary by a standard deviation of about 10 beats, which is why a measured maximum from a chest strap in a race or a hard climb is worth entering.
The Five Zones
| Zone | Name | Purpose |
|---|---|---|
| 1 | Recovery | Easy spinning between hard days; full conversation |
| 2 | Endurance | Aerobic base, fat metabolism, the bulk of training hours; full sentences |
| 3 | Tempo | Sustained brisk riding, group-ride pace; short sentences |
| 4 | Threshold | Hard intervals of 8 to 30 minutes near the lactate turn point; a few words |
| 5 | Maximum | Short intervals of 1 to 5 minutes at or near VO2 max; no talking |
A Worked Example
A 40-year-old with a resting rate of 60 has an estimated maximum of 208 - 28 = 180 and a reserve of 120 beats. Zone 2 is 60 + 120 x 0.60 = 132 to 60 + 120 x 0.70 = 144 bpm. Zone 4 is 156 to 168. Without the resting rate the same rider's Zone 2 would read 108 to 126 bpm, a range most trained cyclists would call recovery, which is the clearest argument for taking your pulse in the morning. For the days with a power meter, the power zones calculator gives the matching watts; what years of endurance training do to the heart itself is in what endurance cycling does to your heart.
Sources: Tanaka H, Monahan KD, Seals DR. Age-predicted maximal heart rate revisited. Journal of the American College of Cardiology, 2001. Karvonen MJ, Kentala E, Mustala O. The effects of training on heart rate. Annales Medicinae Experimentalis et Biologiae Fenniae, 1957.
Frequently Asked Questions
- What is Zone 2 heart rate for cycling?
- Zone 2 is 60 to 70% of your heart rate reserve added to your resting heart rate, which for a 40-year-old with a resting rate of 60 works out to about 132 to 144 beats per minute. It is the pace at which you can speak in full sentences, and it is where most endurance training hours belong. Enter your own age and resting rate for the exact range.
- How do I find my resting heart rate?
- Take it first thing in the morning, before coffee and before getting out of bed, by counting your pulse for 60 seconds or reading a watch or chest strap. Average three mornings. Fit cyclists often sit between 45 and 60 beats per minute. A resting rate that runs 5 to 10 beats above your normal for a few days is a useful sign of fatigue or illness coming on.
- Why does the calculator use 208 minus 0.7 times age instead of 220 minus age?
- The Tanaka equation, 208 minus 0.7 times age, comes from a 2001 analysis of 351 studies and tracks real maximum heart rates more closely across adult ages than 220 minus age, which was never derived from data and underestimates older athletes. Either formula can still miss an individual by 10 beats or more, so a measured maximum from a hard test or race is better than both. Enter one if you have it.
- How do heart rate zones compare with power zones?
- Heart rate measures the body's response and power measures the work, so the two agree on easy days and drift apart on hard ones: heart rate lags at the start of an interval and creeps up in heat and with fatigue. Use power when you have it for intervals, and heart rate for long endurance rides, recovery days, and any bike without a meter. The five heart rate zones line up roughly with power zones 1 through 5.
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