Heart Rate Zone Calculator: Your 5 Training Zones
For a 30-year-old (estimated max HR: 190 bpm), Zone 2 (fat burning/endurance) is 114-133 bpm, Zone 3 (aerobic) is 133-152 bpm, Zone 4 (threshold) is 152-171 bpm. Zone 2 training (60-70% max HR) is optimal for fat burning and cardiovascular base building.
Calculate Your Heart Rate Zones
Based on Tanaka or standard formula.
Max Heart Rate
-- bpm
The 5 Heart Rate Zones
| Zone | % Max HR | Effort | Primary Benefit | Feel | ||||
|---|---|---|---|---|---|---|---|---|
| Zone 1 | 50-60% | Very light | Recovery, warm-up | Can talk and laugh easily | ||||
| Zone 2 | 60-70% | Light | Fat burning, endurance base | Conversational pace | ||||
| Zone 3 | 70-80% | Moderate | Aerobic fitness | Can speak in short sentences | ||||
| Zone 4 | 80-90% | Hard | Lactate threshold, speed | Can only say a few words | ||||
| Zone 5 | 90-100% | Maximum | VO2max, peak power | Cannot speak | Estimating Maximum Heart Rate | Formula | Equation | Accuracy |
| Standard (Fox) | 220 - age | ±10-12 bpm | ||||||
| Tanaka (2001) | 208 - (0.7 x age) | ±7-10 bpm | ||||||
| Gulati (women) | 206 - (0.88 x age) | Better for women | ||||||
| Actual test | Graded exercise test | Gold standard |
Why Zone 2 Matters
80% of your training should be in Zone 2. This low-intensity zone builds mitochondrial density (your cells' energy factories), improves fat oxidation, strengthens your aerobic base, and allows you to train more frequently without overtraining. Elite endurance athletes spend 80-90% of their training time in Zones 1-2.
1. Tanaka H, Monahan KD, Seals DR. Age-predicted maximal heart rate revisited. J Am Coll Cardiol. 2001;37(1):153-156. doi:10.1016/S0735-1097(00)01054-8
2. Karvonen MJ, Kentala E, Mustala O. The effects of training on heart rate: a longitudinal study. Ann Med Exp Biol Fenn. 1957;35(3):307-315.
3. American Heart Association. Target Heart Rates Chart. AHA. https://www.heart.org/en/healthy-living/fitness/fitness-basics/target-heart-rates
Sources
Frequently Asked Questions
How do I find my maximum heart rate?
The most common estimate is 220 minus your age, but this has a standard deviation of ±10-12 bpm. For a more accurate estimate, use the Tanaka formula: 208 - (0.7 x age). The gold standard is a graded exercise test (running on a treadmill with increasing speed/incline until exhaustion) supervised by a healthcare professional.
What heart rate zone burns the most fat?
Zone 2 (60-70% max HR) burns the highest percentage of calories from fat. However, higher zones burn more total calories per minute. For pure fat loss, total calorie burn matters more than fat percentage. That said, Zone 2 is the best zone for building long-term fat-burning capacity because it improves mitochondrial function and fat oxidation over time.
How long should I train in each zone?
Follow the 80/20 principle: 80% of training in Zones 1-2 (easy), 20% in Zones 3-5 (hard). For a runner doing 5 hours/week: 4 hours in Zone 2, 1 hour of intervals/tempo in Zones 3-5. This approach, used by elite athletes, produces better long-term results than going hard every session.
Is the 220 minus age formula accurate?
It is a rough estimate with a standard deviation of ±10-12 beats per minute. For a 30-year-old, predicted max HR is 190, but actual could be anywhere from 178 to 202. The Tanaka formula (208 - 0.7 x age) is slightly more accurate. For women, the Gulati formula (206 - 0.88 x age) may be more appropriate. For precision, get a graded exercise test.
What is the Karvonen method?
The Karvonen method uses Heart Rate Reserve (HRR) — the difference between your max HR and resting HR — to calculate more personalized zones. Formula: target HR = ((max HR - resting HR) x zone %) + resting HR. This method accounts for individual fitness levels (lower resting HR = higher fitness). It requires knowing your resting heart rate, measured first thing in the morning.