Ask a runner what makes training work and they’ll talk about zones. Heart rate zones divide your effort into five levels — from easy recovery jogs to all-out sprints — and training in the right zone is what builds endurance, burns fat, or sharpens speed instead of just making you tired. But zones are personal: they’re percentages of your maximum heart rate, which falls with age. Our free calculator uses the Tanaka equation (the most validated max-HR formula) to compute your max and all five zones in beats per minute.
Heart Rate Zones Calculator
Find your 5 training zones from your estimated maximum heart rate (Tanaka formula).
Max Heart Rate — the Tanaka Equation
The old “220 minus age” rule overestimates max HR for older adults and underestimates for the young. The 2001 Tanaka meta-analysis of hundreds of studies gave a better fit:
Max HR = 208 − 0.7 × age
From there, zones are percentages of max:
| Zone | % of Max | Name | What it trains |
|---|---|---|---|
| Zone 1 | 50–60% | Recovery | Warm-up, cool-down, active recovery |
| Zone 2 | 60–70% | Fat burn / aerobic base | Endurance, fat metabolism — the “talk test” zone |
| Zone 3 | 70–80% | Cardio / tempo | Aerobic capacity, sustained pace |
| Zone 4 | 80–90% | Threshold | Lactate threshold, race pace |
| Zone 5 | 90–100% | Peak | Speed, power — short intervals only |
How to Use the Heart Rate Zones Calculator
- Enter your age.
- Click Calculate — your max HR and all five zone ranges (in bpm) appear.
- Train with a heart-rate monitor, smartwatch, or manual pulse check: multiply the 15-second count by 4.
- Spend most training time in Zones 1–3; Zones 4–5 are for structured intervals, not daily grinds.
Worked Example
A 30-year-old: max HR = 208 − 0.7 × 30 = 208 − 21 = 187 bpm. Zone 2 = 60–70% → 112–131 bpm — a brisk walk or easy jog where you can still hold a conversation. That’s the zone that builds the aerobic engine.
Tips & Limitations
- Max-HR formulas are estimates ±10 bpm; a fitness test gives your true number — but Tanaka is the best no-test option.
- Some medicines (beta-blockers) cap heart rate — zones shift for those users; train with your doctor’s guidance.
- Chest straps beat wrist sensors for accuracy, especially in intervals.
- Beginners: ignore zones 4–5 entirely for the first 2–3 months; build the base in Zone 2.
Frequently Asked Questions
Which zone burns the most fat?
Zone 2 (60–70%) uses the highest proportion of fat for fuel and is sustainable for long sessions — that’s why it’s called the fat-burn zone. Total fat loss still depends on diet (see our calorie deficit calculator).
Is training in Zone 5 dangerous?
For healthy people, short intervals are fine and improve speed. If you have heart conditions, hypertension, or chest pain with exertion, get medical clearance first.
How do I check my heart rate without a watch?
Count your pulse for 15 seconds (neck or wrist) and multiply by 4. Do it mid-exercise for a usable reading.
Why is my heart rate higher in Pakistani summers?
Heat raises heart rate 5–15 bpm at the same effort — train by feel on 40°C+ days and hydrate; our heat index calculator explains the thermal load.
220 − age vs Tanaka — which should I use?
Tanaka (208 − 0.7 × age) — it’s built on a far larger evidence base and is the one exercise physiologists recommend.
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