Heart Rate Training Zone Calculator
Heart Rate Training Zone Calculator
Calculate your 5 personal heart rate training zones and match them to target running paces using your biometrics and Karvonen heart rate reserve (HRR).
1 Biometrics & Heart Rate
Quick Controls: Drag any slider or click a quick-select chip below to set your exact biometrics.
2 Benchmark Race Result
Pace Benchmark: Select a race preset chip or drag the distance slider to pair your HR zones with running pace.
Unified Training Zones
Frequently Asked Questions (FAQs)
How does this heart rate zone calculator work?
This tool uses your biometrics (age, resting heart rate, and max heart rate) and recent running performance to map out five distinct effort levels. Unlike a basic calculator, this creates unified training zones, meaning it shows you exactly which heart rate matches which running pace so you never have to guess how hard you should be working.
Why do I need to see both heart rate and pace zones?
Heart rate tells you how hard your engine is working, while pace tells you how fast you’re moving. By using a pace zone tool alongside a heart rate calculator, you can stay in the right effort bracket even on hilly terrain or in hot weather where your pace might slow down but your heart rate remains high.
How do I find my "reference distance" and time?
To get the most out of the running pace zones, you should enter a recent race time or a “time trial” (like a 12-minute hard run). This acts as the baseline for your fitness. The tool then calculates your “Threshold” and scales your other training zones—from recovery to VO2 Max—based on that performance.
What is the difference between zone 2 and zone 3?
In this heart rate zone calculator, zone 2 (aerobic Base) is your “forever” pace—completely conversational and easy. zone 3 (tempo) is “comfortably hard.” You should be able to speak in short sentences, but your breathing will be noticeably heavier.
How often should I update my training zones?
We recommend recalculating your zones every 4–6 weeks or after a goal race. As your fitness improves, your heart rate will stay lower at faster speeds, meaning your pace zones will shift even if your heart rate zones stay relatively the same.
Can I use these zones for cycling?
While the heart rate math is similar, running pace zones are specific to the impact and mechanics of running. For cycling, your heart rate zones are typically 5–10 beats lower than your running zones due to the lack of weight-bearing impact.
Why is "zone 2" training so popular?
Zone 2 is often called the “aerobic base” zone. Training here helps your body become more efficient at burning fat as fuel and builds the mitochondrial density needed for long-distance endurance. It feels slow, but it builds the foundation that allows you to run faster in higher zones later.
Is it better to train by heart rate or by pace?
Ideally, both. Pace is an objective measure of speed (great for flat roads and race prep), while heart rate is a subjective measure of effort (great for hills, heat, and recovery). Using a unified pace and heart rate tool allows you to cross-reference both metrics to get the most accurate picture of your fitness.
What is the "talk test"?
The talk test is a simple way to estimate your training zones without a monitor.
Zone 1-2: You can speak in full sentences or even sing.
Zone 3: You can speak in short, broken sentences.
Zone 4: You can only say one or two words at a time.
Zone 5: No talking possible.
Do I need an expensive watch to use these zones?
Not necessarily. While a GPS watch with a heart rate monitor makes it easier, you can use this tool to find your goal paces and then use a simple stopwatch on a measured track or a treadmill to stay within your zones.