Target Heart Rate Calculator
Calculate a personalized target heart rate range using the Karvonen method.
🎯 What is the Target Heart Rate Calculator?
The target heart rate calculator finds a personalized training heart rate range using the Karvonen method, also called the heart rate reserve method. Unlike simpler calculators that only use a flat percentage of your maximum heart rate, this tool factors in your resting heart rate too, which produces a range tailored to your individual cardiovascular fitness.
Runners, cyclists, and gym-goers use target heart rate ranges to train at a specific intensity, whether that is an easy recovery pace, a fat-burning aerobic zone, or a challenging tempo effort. Coaches prescribe workouts as a percentage of heart rate reserve because it scales appropriately across people with very different resting heart rates.
A common point of confusion is why this calculator gives a different, usually higher, number than a simple percent-of-max-heart-rate calculator. The Karvonen method adds your resting heart rate back onto the scaled reserve, rather than just multiplying max heart rate by a percentage, which changes the result meaningfully, especially for people with a low resting heart rate.
This tool is useful because it shows every step of the Karvonen calculation, from max heart rate through heart rate reserve to the final target range, so you can verify the math and understand exactly how your personal numbers shape your training zone.
📐 Formula
📖 How to Use This Calculator
Steps
💡 Example Calculations
Example 1 - 30-year-old, resting HR 65, moderate to vigorous (50-85%)
Example 2 - 45-year-old, resting HR 70, aerobic zone (60-80%)
Example 3 - 25-year-old athlete, resting HR 60, high-intensity (70-90%)
❓ Frequently Asked Questions
🔗 Related Calculators
What is the Karvonen formula for target heart rate?
The Karvonen formula is: Target HR = ((Max HR minus resting HR) times intensity%) plus resting HR. It uses your heart rate reserve, the gap between your max and resting heart rate, rather than a flat percentage of max heart rate alone.
How is target heart rate different from heart rate zones?
Heart rate zones (like the standard five-zone model) typically use a straight percentage of max heart rate. Target heart rate via the Karvonen method factors in your resting heart rate too, producing a more personalized, usually slightly higher, target range for the same intensity percentage.
What intensity percentage should I use for fat burning?
60 to 70% of heart rate reserve is commonly associated with the aerobic, fat-burning zone. Higher intensities burn more total calories per minute even though a smaller percentage comes from fat, so total energy expenditure still matters more than the fat percentage alone.
How do I measure my resting heart rate?
Measure your pulse for 60 seconds (or 30 seconds and double it) immediately after waking up, before getting out of bed. Average heart rates range from 60 to 100 bpm, with well-trained athletes often below 60 bpm.
Why does the Karvonen method use heart rate reserve?
Heart rate reserve, the difference between max and resting heart rate, better reflects your cardiovascular capacity than max heart rate alone. Two people with the same max heart rate but very different resting heart rates have different actual capacities, and the Karvonen method captures that difference.
What target heart rate should beginners aim for?
Beginners are generally advised to start in the 50 to 70% intensity range to build an aerobic base safely before progressing to higher-intensity training. Always consult a doctor before starting a new exercise program, especially with pre-existing health conditions.
Is a lower target heart rate range better for weight loss?
Not necessarily. While lower intensities burn a higher percentage of calories from fat, higher intensities burn more total calories per minute, which often results in greater absolute fat loss over the same duration. Total weekly energy expenditure matters more than the intensity zone alone.
Can I use this calculator without knowing my resting heart rate?
You can enter a typical average of 60 to 80 bpm as an estimate, but for an accurate personalized range, measure your actual resting heart rate first thing in the morning over a few days and average the results.
What is a good target heart rate for cardio training?
70 to 85% of heart rate reserve is typically used for cardio and tempo training that improves cardiovascular fitness without being all-out effort. This zone should feel challenging but sustainable for 20 to 40 minutes.
Does age affect my target heart rate range?
Yes, indirectly. Age lowers your estimated max heart rate (via 220 minus age), which lowers your heart rate reserve and therefore your target heart rate range at any given intensity percentage, even if your resting heart rate stays the same.