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Heart Rate Zones Calculator

Find your optimal training zones

Max Heart Rate

190 bpm

Fat Burn Zone

138-151 bpm

Aerobic Zone

151-164 bpm

Resting HR

60 bpm

Maximum Heart Rate

190

bpm (220 - age)

Heart Rate Zones

Recovery
125-138 bpm

50-60% · Light activity, recovery

Fat Burn
138-151 bpm

60-70% · Moderate intensity, fat burning

Aerobic
151-164 bpm

70-80% · Cardiovascular fitness

Anaerobic
164-177 bpm

80-90% · High intensity, performance

Maximum
177-190 bpm

90-100% · Maximum effort, short bursts

Example Calculations

1Heart Rate Zones for a 30-Year-Old (Resting HR 60)

Inputs

Age30
Resting Heart Rate60 bpm

Result

Max Heart Rate190 bpm
Recovery Zone (50-60%)125-138 bpm
Fat Burn Zone (60-70%)138-151 bpm
Aerobic Zone (70-80%)151-164 bpm
Anaerobic Zone (80-90%)164-177 bpm
Maximum Zone (90-100%)177-190 bpm

Max HR = 220 - 30 = 190. Heart Rate Reserve (HRR) = 190 - 60 = 130. Recovery zone min = 60 + (130 x 0.50) = 125 bpm. Recovery zone max = 60 + (130 x 0.60) = 138 bpm. Each zone is calculated using the Karvonen method.

2Heart Rate Zones for a 45-Year-Old (Resting HR 70)

Inputs

Age45
Resting Heart Rate70 bpm

Result

Max Heart Rate175 bpm
Recovery Zone (50-60%)123-133 bpm
Fat Burn Zone (60-70%)133-144 bpm
Aerobic Zone (70-80%)144-154 bpm
Anaerobic Zone (80-90%)154-165 bpm
Maximum Zone (90-100%)165-175 bpm

Max HR = 220 - 45 = 175. HRR = 175 - 70 = 105. Fat Burn min = 70 + (105 x 0.60) = 133 bpm. Fat Burn max = 70 + (105 x 0.70) = 144 bpm. The narrower HRR (105 vs 130) means closer-spaced zones.

Frequently Asked Questions

Q

What are heart rate training zones?

Heart rate zones are ranges based on percentage of max heart rate (MHR). Zone 1 (50-60%): Recovery. Zone 2 (60-70%): Fat burn. Zone 3 (70-80%): Aerobic. Zone 4 (80-90%): Anaerobic. Zone 5 (90-100%): Max effort. Training in specific zones achieves specific goals.

  • Zone 2: Most training should be here (80/20 rule)
  • Zone 3: "Gray zone" - often overused, tiring without max benefit
  • Zone 4-5: High intensity, limited duration (intervals)
  • Mix zones for complete fitness development
Zone% of Max HRFor 30yo (MHR 190)Training Benefit
Zone 1 (Recovery)50-60%95-114 bpmActive recovery, warm-up
Zone 2 (Fat Burn)60-70%114-133 bpmEndurance, fat metabolism
Zone 3 (Aerobic)70-80%133-152 bpmCardiovascular fitness
Zone 4 (Threshold)80-90%152-171 bpmLactate threshold, speed
Zone 5 (Maximum)90-100%171-190 bpmPeak performance, VO2 max
Q

How do I calculate my maximum heart rate?

Basic formula: Max HR = 220 - Age. A 30-year-old has estimated MHR of 190 bpm. More accurate formulas exist (Tanaka: 208 - 0.7×Age, Karvonen method using resting HR). Lab testing or field max-effort test is most accurate.

  • 220 - Age: Simple but less accurate at extremes
  • Tanaka: 208 - (0.7 × Age) - more accurate for older adults
  • Karvonen: Accounts for resting heart rate (more personalized)
  • Field test: Run hard uphill for 3 min, highest HR ≈ max
  • Actual MHR can vary ±10-12 bpm from formulas
Age220 - AgeTanaka FormulaZone 2 Range (60-70%)
25195 bpm190 bpm114-133 bpm
35185 bpm183 bpm110-128 bpm
45175 bpm177 bpm106-124 bpm
55165 bpm170 bpm102-119 bpm
Q

What is the fat burning zone myth?

The "fat burn zone" (60-70% MHR) does burn a higher percentage of calories from fat. BUT higher intensity burns MORE total calories AND more total fat. Zone 4-5 intervals burn more fat overall than steady Zone 2 in same time.

  • Zone 2: 60% of calories from fat, lower total burn
  • Zone 4: 40% from fat, but higher total = more fat burned
  • Example: Zone 2 (30 min) = 200 cal, 120 from fat
  • Example: Zone 4 (30 min) = 400 cal, 160 from fat
  • Best approach: Mix intensities (80% easy, 20% hard)
  • Zone 2 is still valuable: Builds endurance, easier to sustain

The fat burn zone isn't wrong - you do burn a higher proportion of fat at lower intensities. But the total matters more for fat loss. That said, Zone 2 training builds aerobic base and is sustainable long-term, making it valuable for different reasons.

Q

What is the Karvonen method for heart rate zones?

Karvonen method uses Heart Rate Reserve (HRR) = Max HR - Resting HR. Target HR = (HRR × %) + Resting HR. More personalized than straight percentages because it accounts for fitness level (lower resting HR = more fit).

  • HRR = Max HR - Resting HR (your "available range")
  • Target = (HRR × Zone %) + Resting HR
  • Example: Max 190, Resting 60, HRR = 130
  • 70% zone: (130 × 0.70) + 60 = 151 bpm
  • Fitter people have lower resting HR, wider HRR
  • More accurate for trained athletes
MetricSedentary (RHR 80)Fit (RHR 55)Difference
Max HR (Age 35)1851850
HRR10513025
70% Target (Karvonen)154 bpm146 bpm8 bpm lower
70% Target (Simple)130 bpm130 bpmSame
Q

How long should I train in each heart rate zone?

Follow the 80/20 rule: 80% of training in Zones 1-2 (easy), 20% in Zones 4-5 (hard). Zone 3 is the "junk mile zone" - too hard to recover from, not hard enough for max adaptation. Elite athletes train mostly easy.

  • 80/20 rule is evidence-based for endurance athletes
  • Zone 3 trap: Many train here by "feel" but it's suboptimal
  • Easy runs should feel EASY (can hold conversation)
  • Hard days HARD, easy days EASY (polarized training)
  • Recovery between hard sessions is critical
Training TypeZoneWeekly TimePurpose
Easy/Recovery1-260-80%Build aerobic base
Tempo/Threshold3-410-15%Lactate threshold
Intervals/Speed4-55-10%VO2 max, speed
Q

Why is my heart rate high even during easy exercise?

High HR during easy exercise signals: Dehydration, caffeine, heat, altitude, overtraining, illness, poor sleep, stress, or low fitness. Track resting HR - if elevated 5+ bpm above normal, take extra rest. Fitness improves HR efficiency over time.

  • Dehydration: Can increase HR 10-20 bpm
  • Heat/humidity: HR rises to cool body
  • Caffeine: Stimulant effect increases HR
  • Overtraining: Elevated resting and exercise HR
  • Illness: Even mild infection raises HR
  • Stress/poor sleep: Elevated baseline HR
  • Low fitness: HR comes down with training

Monitor your resting heart rate first thing in the morning. If it's significantly elevated (5-10+ bpm above your normal), your body is stressed. Reduce training intensity and address the cause. As fitness improves, both resting and exercise HR decrease.

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Heart Rate Recovery Calculator

Calculate your heart rate recovery score after exercise to assess cardiovascular fitness. Compare HRR results by age, gender, and fitness level instantly.

BMR Calculator

Find out how many calories your body burns at rest with the Mifflin-St Jeor equation. Enter age, weight, and height to see your BMR and daily targets.

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Last Updated: Mar 9, 2026

This calculator is provided for informational and educational purposes only. Results are estimates and should not be considered professional financial, medical, legal, or other advice. Always consult a qualified professional before making important decisions. UseCalcPro is not responsible for any actions taken based on calculator results.

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