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Find max heart rate (220 minus age) and the five training zones in bpm using the Karvonen method with resting HR — for Zone 2 base, threshold and VO2 max work.
Health
Generated on August 22, 2026
Find max heart rate (220 minus age) and the five training zones in bpm using the Karvonen method with resting HR — for Zone 2 base, threshold and VO2 max work.
A heart-rate zone calculator determines your maximum heart rate and the five training zones used in cardiovascular programming. Training in specific zones targets different physiological adaptations — Zone 2 builds aerobic base and fat-burning efficiency, Zone 4 develops lactate threshold, Zone 5 maximizes VO₂ max and power. Whether you run, cycle, row, or swim, knowing your zones and sticking to them in each session makes your training dramatically more effective than simply 'going hard' every day.
Formula
Max HR = 220 − age. Karvonen method: Target HR = Resting HR + (Max HR − Resting HR) × Intensity %.Most amateur runners and gym-goers in Pakistan train one of two ways: too easy to matter, or too hard to repeat. Heart-rate zones solve this — they give you objective brackets so you actually know when 'easy' is easy and when 'hard' is hard. The classic 220-minus-age formula gives you a rough maximum heart rate (within plus or minus 10 to 15 beats), and from there you carve out five training zones, each pushing different physiological adaptations. Zone 2 (60 to 70 percent of max) is the famous 'conversation pace' — slow enough that you can chat in full sentences, hard enough that you're building genuine aerobic base and fat-burning capacity. This is where most of your training should happen, ironically — even elite endurance athletes spend roughly 80 percent of training time at this easy pace, not because they're being lazy but because that's the science. Zone 4 is threshold work (single words only); Zone 5 is short max-effort intervals. If you've been pushing every session into Zone 3 — the famous 'comfortably hard' grey zone — you're producing junk miles that fatigue you without building anything specific. Honest take: a wrist-strap heart rate monitor is the cheapest fitness investment that produces real results. A chest strap is more accurate. Once you can see your heart rate in real time, you stop guessing and start training.
A heart-rate zone calculator determines your maximum heart rate and the five training zones used in cardiovascular programming. Training in specific zones targets different physiological adaptations — Zone 2 builds aerobic base and fat-burning efficiency, Zone 4 develops lactate threshold, Zone 5 maximizes VO₂ max and power. Whether you run, cycle, row, or swim, knowing your zones and sticking to them in each session makes your training dramatically more effective than simply 'going hard' every day. This tool supports both the standard formula and the more personalized Karvonen method.
The traditional '220 − age' formula estimates maximum heart rate — a population average derived from exercise physiology studies, accurate within ±10–15 bpm for most adults. The Karvonen method is more personalized: it uses heart-rate reserve (max HR minus resting HR) to calculate zones, which means fitter people (who have lower resting heart rates) get appropriately higher absolute target zones. Training zones are then defined as percentages of either max HR or heart-rate reserve.
Your 5 training zones as a function of max heart rate (220 − age). Each zone targets a different training adaptation.
| Age | Max HR | Zone 2 (60–70%) | Zone 3 (70–80%) | Zone 4 (80–90%) | Zone 5 (90–100%) |
|---|---|---|---|---|---|
| 20 | 200 | 120–140 | 140–160 | 160–180 | 180–200 |
| 25 | 195 | 117–137 | 137–156 | 156–176 | 176–195 |
| 30 | 190 | 114–133 | 133–152 | 152–171 | 171–190 |
| 35 | 185 | 111–130 | 130–148 | 148–167 | 167–185 |
| 40 | 180 | 108–126 | 126–144 | 144–162 | 162–180 |
| 45 | 175 | 105–123 | 123–140 | 140–158 | 158–175 |
| 50 | 170 | 102–119 | 119–136 | 136–153 | 153–170 |
| 55 | 165 | 99–116 | 116–132 | 132–149 | 149–165 |
| 60 | 160 | 96–112 | 112–128 | 128–144 | 144–160 |
Zone 2 (easy conversational pace) is where most of your training time should go — builds aerobic base.
Zone 4 (tempo / threshold) = 'comfortably hard' — you can speak single words but not sentences.
Zone 5 (max effort) sustains for 1–5 minutes; used for VO₂ max intervals.
Elite endurance athletes spend ~80% of training time in Zone 2 — the counter-intuitive 'slow' path to fast.
Age 30 with resting HR 60 bpm gives max HR 190. Zone 2 (60–70% intensity): 138–151 bpm — the aerobic fat-burning zone.
Age 45 with resting 70 gives max HR 175. Zone 4 (80–90%): 154–164 bpm — lactate threshold training, high but sustainable.
Age 25 with resting 55 gives max HR 195. Zone 5 (90–100%): 181–195 bpm — maximum effort, short intervals only.
Age 50 walker has target 98–114 bpm in Zone 1–2 for a recovery pace or brisk walk — perfect for overall health and longevity.
A 35-year-old runner at 65 bpm resting training in Zone 2 aims for 134–147 bpm — the conversation-pace zone used by elite endurance athletes for base mileage.
HIIT intervals typically push into Zone 4–5 briefly (1–4 minutes) with Zone 1–2 active recovery between — a pattern backed by extensive research for time-efficient fitness gains.
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