What Heart Rate is Zone 2? The Number and Range

Zone 2 has a specific, measurable definition. It is not "easy" or "comfortable" in a vague sense. It is 60 to 70 percent of your maximum heart rate, held for at least 30 continuous minutes. That ceiling matters far more than the floor.

What heart rate is Zone 2?

Zone 2 heart rate is 60 to 70 percent of your maximum heart rate. For a 35-year-old the max HR estimate is 185 bpm, putting Zone 2 at 111 to 130 bpm. For a 50-year-old (max HR 170) it is 102 to 119 bpm. The upper ceiling, 70 percent, is the number most athletes need to monitor.

The most common mistake is treating Zone 2 as "anything that feels easy." Easy is subjective. The 70 percent ceiling is not. Two athletes the same age can have different max heart rates and need different Zone 2 ceilings by 10 to 15 bpm.

Age	Est. max HR	Zone 2 floor (60%)	Zone 2 ceiling (70%)
25	195 bpm	117 bpm	137 bpm
30	190 bpm	114 bpm	133 bpm
35	185 bpm	111 bpm	130 bpm
40	180 bpm	108 bpm	126 bpm
45	175 bpm	105 bpm	123 bpm
50	170 bpm	102 bpm	119 bpm
55	165 bpm	99 bpm	116 bpm
60	160 bpm	96 bpm	112 bpm

Max HR estimated with 220 minus age. See Zone 2 heart rate by age for a full table.

How to find your Zone 2 heart rate without a lab

The three practical methods are: the 220-minus-age formula (least accurate but no equipment required), a measured max HR from a hard all-out effort (most accurate), and the talk test (no monitor required, surprisingly reliable).

1. Formula method (220 minus age)

Take 70 percent of the result. For a 42-year-old: 220 minus 42 is 178. Seventy percent is 125 bpm. This is your ceiling.

The formula overestimates max HR for many athletes over 50 and underestimates for some trained younger athletes. Treat it as a starting point, not a hard number.

2. Measured max HR

Warm up for 15 minutes, then run or ride as hard as you possibly can for 3 to 4 minutes, back off for 2 minutes, then sprint all-out for 90 seconds. The highest heart rate your monitor records during the sprint is your measured max HR. Multiply by 0.70 for your Zone 2 ceiling.

A field test like this is not safe for unconditioned athletes. If you have not trained consistently for at least 3 months, use the formula method.

3. Talk test

Run or ride until you can speak in complete sentences but would prefer not to. That is roughly 70 percent of max HR. If you can sing, you are in Zone 1. If you can only manage words, you are in Zone 3. Full sentences, mildly uncomfortable: Zone 2.

The talk test correlates well with the first ventilatory threshold, which is close to the Zone 2 upper boundary.

Why the Zone 2 ceiling changes with fitness

As you train more Zone 2, your cardiovascular system becomes more efficient. The same 70 percent of max HR becomes a faster pace, a higher power output, or a lower perceived effort. This is the adaptation you are chasing. After 6 to 12 weeks of consistent Zone 2 training, most athletes find their Zone 2 running pace has improved by 30 to 60 seconds per mile at the same heart rate ceiling.

Max HR itself does not change with training. The ceiling in bpm stays the same. What changes is how much work you can do at that ceiling.

Karvonen method: a more personalized Zone 2 range

The standard method uses percentage of max HR. The Karvonen method uses heart rate reserve (max HR minus resting HR) and tends to produce a slightly higher Zone 2 ceiling, particularly for athletes with low resting heart rates.

Karvonen Zone 2 = (max HR minus resting HR) times 0.60 to 0.70, plus resting HR.

For an athlete with a 180 bpm max HR and 50 bpm resting HR:

• Heart rate reserve: 130 bpm
• Zone 2 range: (130 x 0.60) + 50 to (130 x 0.70) + 50
• Result: 128 to 141 bpm

The Karvonen range is higher than the simple percentage range (108 to 126 bpm from the table above) because it accounts for the cardiac work done just maintaining resting function. Use the heart rate zone calculator to get both methods side by side.

What if my "easy" pace is above Zone 2?

This is extremely common. Most recreational runners find their default easy pace sits at 75 to 82 percent of max HR, squarely in Zone 3. Slowing to true Zone 2 can feel frustrating at first, sometimes requiring 60 to 90 seconds per mile slower than expected.

This is not a sign of low fitness. It means your aerobic base, the mitochondrial density that lets you run fast at a low heart rate, has not yet caught up with your muscular fitness. Zone 2 training is how you fix that gap.

Zone 2 is one of five bands; for the full set and their bpm ranges, see heart rate zones. Heart rate zones tell you how hard you are working; VO2 max tells you how high your aerobic ceiling sits. For where your number should land, see VO2 max by age, and to raise it, see how to improve your VO2 max.

For a comparison of GPS watches by Zone 2 HR accuracy, see best GPS watches for Zone 2 training.

Frequently asked questions

How do I find my maximum heart rate without a test?

The most common formula is 220 minus your age, which gives a rough estimate. A more accurate formula for most adults is 208 minus (0.7 times your age), which was derived from a larger and more diverse sample. Both are population averages with a standard deviation of roughly 10 to 12 bpm, meaning your actual max could be notably higher or lower. For a measured max, warm up for 15 minutes, then run as hard as possible up a steep hill for 3 to 4 minutes, recover briefly, and sprint all-out for 90 seconds. The peak reading is your measured max HR.

What is the difference between Zone 2 and Zone 3 heart rate?

Zone 2 is 60 to 70 percent of max HR, where fat is the dominant fuel and blood lactate stays near baseline. Zone 3 is roughly 70 to 80 percent of max HR, where carbohydrate begins to dominate and lactate starts rising above resting levels. The physiological gap matters for training: Zone 2 triggers mitochondrial adaptations and fat-burning enzyme increases that Zone 3 does not. Zone 3 also costs more recovery. The practical boundary is the talk test: full comfortable sentences indicate Zone 2, short clipped answers indicate Zone 3.

Can I do Zone 2 training by feel rather than heart rate?

Yes, with some caveats. The talk test is a reliable proxy: if you can comfortably finish a 10-word sentence without pausing to breathe, you are probably in Zone 2. If you can only manage a few words, you have drifted into Zone 3 or higher. The downside of feel-based training is that perceived effort shifts with fatigue, temperature, altitude, and stress, so the same pace can be Zone 2 on a cool day and Zone 3 on a hot one. A heart rate monitor catches these shifts automatically.

Is Zone 2 the same as the aerobic zone?

Zone 2 and the aerobic zone refer to the same intensity range in most training frameworks. The label differs by system: Coggan uses Zones 1 through 7 for cycling power, Friel uses similar percentage-based zones for running, and some systems use only 3 or 5 zones with different cutoffs. Regardless of the numbering, the physiological definition is consistent: sustained aerobic work below the first ventilatory threshold, where fat is the primary fuel and lactate remains at baseline. That is Zone 2 in a 5-zone system and the aerobic zone in a 3-zone system.