Heart Rate Zone Calculator
Heart Rate Training Zones
The five training zones with intensity ranges and training benefits.
| Zone | Intensity | % of Max HR | Purpose |
|---|---|---|---|
| Zone 1 | Very Light | 50-60% | Recovery, warm-up, cool-down |
| Zone 2 | Light | 60-70% | Aerobic base, fat burning, endurance |
| Zone 3 | Moderate | 70-80% | Aerobic fitness, stamina |
| Zone 4 | Hard | 80-90% | Anaerobic threshold, speed |
| Zone 5 | Maximum | 90-100% | VO2 max, peak power, sprints |
How We Calculate This
This heart rate zone calculator uses established formulas and industry-standard data to provide accurate estimates.
- Enter your specific values into the calculator fields above
- Our algorithm applies the relevant formulas using your inputs
- Results are calculated instantly in your browser — nothing is sent to a server
- Review the detailed breakdown to understand how each factor affects your result
These calculations are estimates based on standard formulas. For critical decisions, always consult a qualified professional.
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Heart rate training zones help you exercise at the right intensity for your goals — whether that's fat burning, endurance, or peak performance.
The basic rule:
- Your max heart rate is estimated as 220 minus your age (or enter a known value)
- The Karvonen formula uses resting HR for more personalized zones: target = ((max - resting) × %) + resting
- Five zones range from 50% to 100% of max HR, each targeting different adaptations
The Karvonen method is more accurate because it accounts for your fitness level through resting heart rate. A lower resting HR indicates better cardiovascular fitness.
When Would You Use This Calculator?
This heart rate zone calculator is designed for anyone who needs quick, reliable estimates without complex spreadsheets or professional consultations.
- When you need a quick estimate before committing to a purchase or project
- When comparing different options or scenarios side by side
- When planning a budget and need to understand potential costs
- When you want to verify a quote or estimate you've received from a professional
- When teaching or learning about the concepts behind these calculations
Frequently Asked Questions
What are the 5 heart rate zones?
Zone 1 (50-60%) is easy recovery. Zone 2 (60-70%) builds aerobic base and burns fat. Zone 3 (70-80%) improves aerobic fitness. Zone 4 (80-90%) increases speed and anaerobic threshold. Zone 5 (90-100%) is maximum effort for short bursts.
Which zone is best for fat burning?
Zone 2 (60-70%) uses the highest percentage of fat for fuel. However, higher zones burn more total calories. For weight loss, total calorie burn matters more than the fat-burning zone. Zone 2 is ideal for longer, sustainable workouts.
How do I find my resting heart rate?
Measure your heart rate first thing in the morning before getting out of bed. Count your pulse for 60 seconds (or 30 seconds and multiply by 2). Do this for 3-5 days and take the average. Most adults have a resting HR of 60-100 bpm.
Is 220 minus age accurate for max heart rate?
The 220-age formula is a rough estimate with a standard deviation of about 10-12 bpm. It works for general training guidance but can be off for individuals. A supervised max HR test or field test gives a more accurate number.
What is the Karvonen formula?
The Karvonen formula calculates target heart rate as: ((Max HR - Resting HR) × intensity%) + Resting HR. It's more personalized than simply using a percentage of max HR because it factors in your fitness level through your resting heart rate.
How long should I train in each zone?
Most training (about 80%) should be in Zones 1-2 for aerobic base building. About 15-20% can be in Zone 3-4 for tempo and threshold work. Zone 5 should only be 5% or less, used for intervals. This 80/20 approach is backed by research on elite athletes.