Heart Rate Zone Calculator computes your five training heart rate zones based on your age and resting heart rate — using the Karvonen formula or percentage of max HR — showing the BPM range for each zone from recovery to maximum effort.
How it works: Maximum HR (MHR) is estimated as 220 − age. With the Karvonen method, Heart Rate Reserve (HRR) = MHR − Resting HR. Target HR = (HRR × zone %) + Resting HR. Without resting HR, zones use simple percentages of MHR. Each zone corresponds to a physiological training effect.
When you need it: Users typically reach for Heart Rate Zone Calculator when setting target heart rate ranges on a fitness tracker or GPS watch, planning workouts in different training zones (fat burn, aerobic, anaerobic), following a structured training plan that specifies zone targets, or understanding what your heart rate monitor readings mean during exercise.
Key Facts
What each training zone means physiologically and what adaptations it produces.
| Zone | % of Max HR | How It Feels | Physiological Effect | Typical Workout |
|---|---|---|---|---|
| Zone 1 — Recovery | 50–60% | Very easy, conversational | Active recovery, blood flow, fat metabolism | Easy walks, warm-up, cool-down |
| Zone 2 — Aerobic Base | 60–70% | Easy — can hold a conversation | Builds aerobic base, improves fat burning | Long slow runs, easy cycling |
| Zone 3 — Aerobic | 70–80% | Moderate — comfortable effort | Improves cardiovascular efficiency and endurance | Tempo runs, moderate cycling |
| Zone 4 — Threshold | 80–90% | Hard — breathing heavily | Raises lactate threshold, improves race pace | Interval training, hard tempo |
| Zone 5 — Maximum | 90–100% | Maximum effort — unsustainable | Develops speed, power, VO2 max | Sprint intervals, final race push |
Beginners should spend most training time in Zone 2 to build aerobic base before adding intensity. The '80/20 rule' — 80% Zone 1–2 and 20% Zone 4–5 — is supported by research for endurance sport performance. Heart rate lags effort by 1–2 minutes; use RPE (rate of perceived exertion) to pace intervals.
A Heart Rate Zone Calculator is a tool that helps you calculate optimal heart rate zones for effective cardio and endurance training..
It gives direct, structured output so you can copy, download, or reuse the result immediately.
Heart Rate Zone Calculator helps you complete calculate optimal heart rate zones for effective cardio and endurance training. in a practical, browser-based workflow. Use it for quick checks, repeatable tasks, and clean output you can reuse immediately.
Input:
Sample input for Heart Rate Zone CalculatorOutput:
Structured result ready to copyHeart Rate Zone Calculator focuses on this specific workflow.
Simple Calculator is useful when you need perform basic arithmetic operations like addition, subtraction, multiplication, and division instantly.
Heart Rate Zone Calculator is a browser-based tool that helps you complete this task with clear input controls and ready-to-use output.
Add your input, review the result, adjust options if needed, and copy or download the final output.
It reduces manual errors, gives consistent output, and handles repetitive formatting or conversion steps in one place.
Yes. The workflow is straightforward and works for both first-time users and advanced users.
Check your input format and selected options, then run the tool again. Most issues come from invalid input values or mismatched settings.