Running Heart Rate Zones Calculator
Find your five training zones from your max heart rate. Add a resting heart rate and the calculator switches to the more personal heart-rate reserve method.
Max HR is estimated as 211 - 0.64 x age (Tanaka). Add a resting HR to switch to the more personal Karvonen reserve method.
| Zone | Heart rate (bpm) |
|---|---|
| Zone 1 - Recovery | 95 - 113 |
| Zone 2 - Easy | 113 - 132 |
| Zone 3 - Aerobic | 132 - 151 |
| Zone 4 - Threshold | 151 - 170 |
| Zone 5 - Max | 170 - 189 |
How the zones are calculated
With only a max heart rate, the calculator cuts everything into five bands of percent of max, from 50 to 60% for recovery up to 90 to 100% for all-out work. Add your resting heart rate and it switches to the Karvonen method, which builds the zones from your heart-rate reserve, the span between resting and max. Reserve-based zones fit real runners better, because two athletes with a max of 185 but resting rates of 45 and 70 are not the same engine.
If you do not know your max, the calculator estimates it as 211 minus 0.64 times your age, a formula from a large population study that tracks measured values considerably better than the old 220 minus age. It is still an average. Real maxes at any age are spread across a range of 20 beats or more.
A worked example
A 40-year-old gets an estimated max of 185. On percent of max, zone 2 spans 111 to 130 bpm. Add a resting rate of 60 and the Karvonen method moves zone 2 up to 135 to 148 bpm. That 20-beat shift is not a rounding difference, it is the gap between shuffling and actually running, which is why entering your resting heart rate is worth the ten seconds it takes. Check it the moment you wake up, before coffee, for a few mornings and use the typical value.
Using the zones without fooling yourself
The pattern behind nearly every successful training plan: most weekly volume in zones 1 and 2 at conversational effort, with the hard work concentrated into zones 4 and 5 on two days a week. The common failure lives in the middle. Day after day of zone 3 is too hard to recover from and too easy to force adaptation, and it feels productive the whole time. A crude test: if you can speak a sentence but not a paragraph, you have drifted into zone 3. Slow down or commit.
Two honest caveats. An estimated max can miss your real one by ten beats either way, so if zone 2 feels absurd, test your max in the field before abandoning the method. And heart rate drifts upward in heat at a fixed pace, so on hot days trust the zone, not the pace it usually maps to. Heat slows everyone; the zone keeps the effort honest. For the pace version of the same idea, get your training paces from the VDOT calculator.
Heart rate zone questions
- How do I find my actual max heart rate?
- Race a hard 5K and note the highest reading in the final minutes, then add 3 to 5 beats. Or run 3 x 3 minutes up a steady hill, each rep harder than the last, and take the peak from the final rep. Any age formula is a population average; a field test is you.
- Why is zone 2 so slow?
- Because easy is a physiological state, not a pace. Zone 2 is where you build aerobic capacity while staying fresh enough to hit the hard days hard. If it feels embarrassingly slow, it is working. Most runners who feel stuck have easy days that are simply too fast.
- Should I use percent of max or the Karvonen method?
- If you know your resting heart rate, use Karvonen. Anchoring the zones to your heart-rate reserve accounts for your personal floor, and the zones it produces track effort noticeably better, especially for fit runners with a low resting rate.