Heart Rate Calculator

Find your Maximum Heart Rate and target heart rate zones for fat burn, cardio, and peak performance training.

Calculate your maximum heart rate and target training zones.

About This Calculator

The Heart Rate Zone Calculator is your guide to smarter, more effective cardiovascular training. Instead of guessing workout intensity, heart rate zones provide objective targets that align with specific physiological adaptations—from fat burning to maximum athletic performance. Elite athletes and fitness enthusiasts alike rely on heart rate training to optimize results.

Your maximum heart rate (MHR) serves as the ceiling for all zone calculations. The most common formula (220 minus age) provides a reliable estimate for most people. From this maximum, training zones are calculated as percentages, each triggering different metabolic and cardiovascular responses. Training consistently in the right zones leads to measurable improvements in endurance, speed, and recovery.

The Karvonen formula provides even more personalized zones by factoring in resting heart rate, reflecting your current fitness level. Lower resting heart rate generally indicates better cardiovascular fitness. As your fitness improves, you'll notice your heart rate stays lower at the same effort level—a measurable sign of progress.

Heart Rate Formulas

Max HR (simple) = 220 - Age
Target HR = (Max HR - Resting HR) × Zone% + Resting HR (Karvonen)

The Karvonen formula accounts for fitness level through resting heart rate.

Training Zone Reference

Zone	% of Max HR	Purpose
Zone 1 (Recovery)	50-60%	Active recovery, warm-up
Zone 2 (Fat Burn)	60-70%	Builds aerobic base, burns fat
Zone 3 (Aerobic)	70-80%	Improves cardiovascular efficiency
Zone 4 (Threshold)	80-90%	Increases lactate threshold
Zone 5 (VO2 Max)	90-100%	Maximum performance, short bursts

Practical Example

A 35-year-old with resting HR of 60 bpm: Max HR = 220 - 35 = 185 bpm. Zone 2 (fat burn) = 111-130 bpm. Zone 4 (threshold) = 148-167 bpm.

Health Tips

Spend 80% of training time in Zones 1-2 for sustainable fitness gains
Use a heart rate monitor for accurate zone training
Check resting HR first thing in the morning for best accuracy
High resting HR can indicate overtraining or illness
Re-test max HR annually as it changes with age and fitness

Scenario Comparison: Training Goals by Heart Rate Zone

Training Goal	Primary Zone	Session Duration	Weekly Frequency
Fat burning / Weight loss	Zone 2 (60-70%)	45-60 min	4-5 sessions
Aerobic endurance	Zone 3 (70-80%)	30-45 min	3-4 sessions
Lactate threshold improvement	Zone 4 (80-90%)	20-30 min	2 sessions
Peak performance / VO2max	Zone 5 (90-100%)	Intervals only	1-2 sessions

Common Mistakes to Avoid

Using 220 minus age for everyone: This formula has ±10-12 bpm error. Use Tanaka formula (208 - 0.7 × age) or a field test for accuracy.
Training in Zone 3 too often: The "gray zone" is too hard for recovery, too easy for gains. Polarize: 80% easy (Zone 1-2), 20% hard (Zone 4-5).
Ignoring resting heart rate changes: A 10+ bpm increase from baseline indicates overtraining, illness, or stress. Take a rest day.
Not accounting for external factors: Caffeine, heat, dehydration, and altitude all elevate HR. Adjust zones or use perceived effort on affected days.

Health Benchmarks: Heart Rate Standards

Metric	Normal Range	Athletic	Source
Resting Heart Rate (Adult)	60-100 bpm	40-60 bpm	AHA
Max HR (Age 30)	~190 bpm	185-195 bpm	ACSM
Max HR (Age 50)	~170 bpm	165-175 bpm	ACSM
Heart Rate Recovery (1 min)	>12 bpm drop	>20 bpm drop	AHA
Target HR for Moderate Exercise	50-70% of max	60-75% of max	CDC

When to Use This Calculator vs Others

This calculator: Best for determining training intensity zones and understanding cardiovascular effort during exercise.
Calorie Calculator (TDEE): Use when planning daily nutrition and understanding total energy expenditure.
Calories by Distance: Use when you want to know calories burned for a specific run, walk, or bike distance.
BMR Calculator: Use when you need your baseline metabolic rate for weight management planning.

Related tools: Calorie Calculator for energy planning, BMI Calculator for health assessment, and Yoga Calories Calculator for low-intensity options.

Frequently Asked Questions

How is max heart rate calculated?

Max HR = 220 - Age. More accurate: 206.9 - (0.67 × Age). For 35-year-old: Max = 220-35 = 185 bpm. This is the theoretical ceiling for training zones.

What heart rate zone burns the most fat?

Zone 2 (60-70% max HR) burns highest percentage of fat. But Zone 4 (80-90%) burns more total calories. For weight loss, mix both zones in training.

What is a good resting heart rate?

60-100 bpm is normal. Athletes: 40-60 bpm. Lower is generally better fitness. Check first thing in the morning. High resting HR may indicate overtraining.