Your target heart rate for moderate exercise is 50–70% of your heart rate reserve above resting, and 70–85% for vigorous training. This free calculator applies the Karvonen formula — which uses your personal resting heart rate, not just your age — to give exact beats-per-minute zones from recovery to maximal effort.
Training at the right heart rate is the difference between exercise that builds your heart and exercise that just tires you out. This target heart rate calculator uses the Karvonen formula — the method that accounts for your personal resting heart rate, not just your age — to give you exact beats-per-minute zones for fat burning, endurance and performance training.
Get your zones below, then read on: your maximum heart rate, what each training zone actually does, and the safety rules that matter more than any number.
Target Heart Rate (Karvonen)
Ideal pulse zones for your exercise intensity.
Max heart rate: the ceiling everything is measured from
Your maximum heart rate (HRmax) is the highest rate your heart can sustain. Two standard estimates:
- Classic: HRmax = 220 − age. Simple, universally quoted, with a real spread of ±10–12 bpm between individuals.
- Tanaka: HRmax = 208 − 0.7 × age. Built on a larger dataset; more accurate for adults over 40.
A 40-year-old lands at 180 bpm classic, 180 bpm Tanaka — the formulas agree in midlife and diverge at the extremes of age. A lab or field test measures the real value, but the estimates are good enough to set useful zones.
The Karvonen formula: why resting heart rate matters
Two 40-year-olds do not have the same fitness, and their zones should not match. The Karvonen method fixes this by working with your heart rate reserve — the gap between maximum and resting:
- Target HR = (HRmax − resting HR) × intensity % + resting HR
A fit person with a resting rate of 50 gets meaningfully different — and more accurate — zones than someone resting at 75. Measure your resting rate first thing in the morning, before coffee, averaged over a few days.
Heart rate zones: what each one trains
| Zone | % of heart rate reserve | Feels like | What it builds |
|---|---|---|---|
| Zone 1 — Recovery | 50–60% | Very easy, full conversation | Active recovery, base circulation |
| Zone 2 — Endurance | 60–70% | Comfortable, can talk in sentences | Aerobic base, fat metabolism — where most training belongs |
| Zone 3 — Tempo | 70–80% | Working, short phrases only | Aerobic power, sustainable pace |
| Zone 4 — Threshold | 80–90% | Hard, few words | Lactate threshold, race pace |
| Zone 5 — Maximal | 90–100% | Unsustainable beyond minutes | Peak power and speed — small doses |
The famous “fat-burning zone” is Zone 2 — it burns the highest proportion of fat, though harder zones burn more total calories per minute. For health and longevity, the evidence overwhelmingly favours lots of Zone 2 with a little Zone 4–5.
Target heart rate by age
Using the classic formula and the moderate-to-vigorous band (50–85% of HRmax) that public health guidance references: at 30, roughly 95–162 bpm; at 40, 90–153; at 50, 85–145; at 60, 80–136; at 70, 75–128. Your Karvonen zones from the calculator above are tighter and personal — prefer them.
Resting heart rate: the free fitness test
Your morning resting pulse is a running report card on cardiovascular fitness:
| Resting heart rate | Typical meaning (adults) |
|---|---|
| 40–55 bpm | Common in endurance-trained athletes |
| 55–65 bpm | Very good fitness |
| 65–75 bpm | Average range |
| 76–85 bpm | Room to improve; watch the trend |
| Persistently >90–100 bpm | Worth a medical review |
Large cohort studies link lower resting rates to better long-term cardiovascular outcomes, and consistent aerobic training reliably lowers yours by 5–10 bpm over months — one of the few fitness metrics that improves almost mechanically with volume. Just as informative is a rise: a resting rate creeping 5–10 bpm above your personal norm often flags incoming illness, overtraining or poor sleep days before you feel it.
Heart rate variability: the recovery dial
HRV measures the tiny beat-to-beat timing differences controlled by your autonomic nervous system — higher variability generally reflecting a rested, stress-resilient state, suppressed HRV following hard training, alcohol, illness and poor sleep. Two honest rules make it useful instead of anxious: HRV is only meaningful against your own baseline (absolute numbers vary enormously between people — comparing yours to a friend’s is meaningless), and it belongs to trends, not days. Used that way — easy week when the 7-day trend sags, push when it’s solid — it is a legitimate training tool; checked hourly, it is a stress generator measuring itself.
How accurate is your smartwatch?
Optical wrist sensors are excellent at rest and good during steady cardio, but they lag and stumble where it matters most: rapid intervals, wrist-flexing sports (cycling, rowing, lifting) and, per several studies, darker skin tones and cooler skin. Fit fixes half of it — snug, one finger above the wrist bone. For zone-precise training, a chest strap remains meaningfully more accurate, reading the heart’s electrical signal like an ECG rather than inferring from blood flow. Sensible split: wrist for daily resting-rate and trend tracking, strap for interval days. And any watch’s “irregular rhythm” notification is a prompt for a real ECG, not a diagnosis — in either direction.
Same zones, different sports
Your Karvonen zones are universal, but the heart behaves differently across disciplines: running produces the highest rates (whole-body, weight-bearing), cycling typically runs ~5–10 bpm lower at equal effort, and swimming lower again (horizontal position, cool water) — so a “zone 3” bike ride at running-zone numbers is actually harder than intended. Strength training is the odd one out: rates spike between sets, but lifting is not aerobic work and shouldn’t be steered by cardio zones at all. If you train multiple sports seriously, set zones per sport — or lean on the talk test, which self-calibrates everywhere.
Building a week around your zones
The distribution with the deepest evidence base — from elite endurance practice down to general health — is roughly 80/20: about 80% of cardio time easy (zones 1–2, full-sentence pace) and 20% genuinely hard (zones 4–5), with zone 3 used deliberately rather than as the default everything-pace most people drift into. A practical health-first week: 3–4 easy zone-2 sessions of 30–45 minutes, one interval session (e.g. 4×3 minutes hard with equal recoveries), plus two strength sessions the zones don’t govern. The common failure mode is training the middle — too hard to recover from daily, too easy to force adaptation — which the calculator’s concrete numbers are precisely designed to break.
When heart rate numbers need a doctor first
Formulas assume a healthy heart and an undisturbed rhythm. Get medical guidance before heart-rate-based training if you have known heart disease, chest pain or unusual breathlessness on exertion, fainting episodes, or you take rate-controlling medication — beta-blockers in particular lower both resting and maximum heart rate, making standard zones invalid. And treat exercise symptoms — chest pressure, palpitations that persist, lightheadedness — as a stop signal, not a zone problem. Acibadem’s cardiology specialists offer proper exercise testing when precision or safety demands it; our blood pressure calculator covers the other half of cardiovascular numbers.
This tool is informational. It does not replace an exercise assessment — especially if you have cardiovascular disease, symptoms during exercise, or take heart medication.
Frequently asked questions
What is my target heart rate?
For moderate exercise, 50–70% of your heart rate reserve above resting; for vigorous, 70–85%. The calculator applies the Karvonen formula to your age and resting heart rate to give exact beats per minute.
How do I calculate my max heart rate?
Estimate it as 220 minus your age, or 208 − 0.7 × age (Tanaka, better over 40). Individual variation of ±10 bpm is normal — perceived effort and the talk test remain useful cross-checks.
What heart rate burns fat?
Zone 2 — about 60–70% of heart rate reserve — uses the highest proportion of fat for fuel and can be sustained long enough to matter. Total calorie balance still decides fat loss.
Is a high resting heart rate bad?
A resting rate persistently above 100 bpm (or a big unexplained change from your normal) deserves a medical review. Fit adults commonly rest at 50–70 bpm; athletes lower still.
Why is my heart rate high on easy runs?
Heat, dehydration, poor sleep, stress, caffeine and accumulated fatigue all push heart rate up at a given pace. Persistent unexplained elevation is worth discussing with a doctor.
Do beta-blockers change my zones?
Yes — they cap heart rate, so age-based formulas overestimate badly. Train by perceived exertion or get zones set from a supervised test; ask your cardiologist.
Is a resting heart rate of 100 bad?
At the top of the technical normal range — but persistently there, it deserves a review of sleep, stress, caffeine, thyroid and fitness with a doctor. A one-off 100 after coffee and a bad night is unremarkable.
Can I increase my max heart rate with training?
No — max HR is set by age and genetics and slowly declines regardless of fitness. Training improves what you can sustain at every percentage of it, which is what actually matters.
How many minutes of zone 2 per week?
The 150-minute moderate-activity guideline maps neatly onto zone 2; endurance-minded people commonly build to 3–5 hours. It should feel almost suspiciously easy — that is the point.
Does caffeine raise heart rate?
Modestly and briefly — a few bpm for a couple of hours, more in irregular users. It’s noise for training purposes, but worth standardizing before comparing resting-rate readings.
Why does my heart rate spike when I stand up?
A brief rise of 10–20 bpm on standing is normal plumbing. Sustained increases of 30+ bpm with dizziness on standing merit a medical evaluation (orthostatic intolerance, including POTS).
Numbers are a starting point — not a diagnosis
If your results raise questions, Acibadem specialists can review your situation properly: share your case and receive a free, no-obligation medical opinion from the relevant department.