Heart-rate zone calculator
Explore estimated training ranges from the inputs you choose. Keep the limitations of age-predicted heart rate in view.
Choose an effort you can build on
Cardio & conditioning
Start with an activity you can repeat, an effort you can recognize and a gradual way to build your routine. Brisk walking, cycling, swimming and running can all contribute; how hard the activity feels depends on your fitness and the way you do it. [2]
The conditioning questions are which intensity, how much, how to fit it alongside lifting and how to measure it. Use the guidance and four tools available below; the eleven focused guide topics are in preparation.
Find your starting point
01 / The choice in front of you
Start with your next decision.
You do not need to solve the whole training plan at once.
“I'm new to cardio.”
Choose something you can fit into your week, then build the time or frequency gradually.
Build a repeatable routine“How hard should it feel?”
Recognize moderate and vigorous effort with a practical talk test.
Compare the effort levels“I want to understand a number.”
Find pace, heart-rate, walking-energy and VO2 max tools, with estimates kept in perspective.
Open an available tool02 / Recognize the effort
Use your breathing as a practical reference.
Cardio gets you breathing harder and raises your heart rate. The same activity can feel different to different people. [2]
| Effort | What conversation feels like | Activity examples |
|---|---|---|
| Moderate | You can talk, but singing is difficult. | Brisk walking, recreational swimming or cycling at a comfortable pace on level terrain. |
| Vigorous | You need to pause for breath after a few words. | Jogging, running, swimming laps or faster cycling. |
Use the examples as context, then notice your own response. An activity that is moderate for one person may be vigorous for another. A talk test helps you recognize effort; it does not measure a precise physiological threshold. [2]
Heart-rate ranges can add another reference. Age-based predictions are averages, and some medications affect heart rate. If you have a heart condition or take medication that affects your pulse, ask a healthcare professional which targets are appropriate. [7]
03 / A weekly reference
Build toward the general adult guidance.
The CDC's aerobic reference is 150 minutes of moderate activity or 75 minutes of vigorous activity a week, or an equivalent combination. Spread it across the week in chunks that fit your life. Muscle-strengthening activity belongs on at least two days as well. [1]
For this weekly calculation, one minute of vigorous activity counts like about two minutes of moderate activity. For example, 60 moderate minutes plus 45 vigorous minutes adds up to 150 moderate-equivalent minutes: 60 + (2 × 45). That is an arithmetic example of mixing intensities, not a first-week schedule. [1]
Some activity is better than none, as WHO emphasizes. You can start below the weekly reference and build from what you can currently manage. [4]
04 / Make it repeatable
Build the routine before adding more intensity.
NIDDK recommends increasing how long or how often you are active before later raising the intensity. That could mean extending a walk or adding another day before choosing a faster pace. [3]
Choose an activity that fits your interests and access. Walking, cycling, water aerobics and seated aerobics offer different options.
Track the activity, minutes and how you felt. Compare those details when deciding what to change next. [3]
If you also lift, make room for both kinds of activity: the general health guidance includes aerobic and muscle-strengthening work. The focused guides on combining them and choosing an order are listed below as topics in preparation.
Ease into the session and out of it
The American Heart Association suggests warming up for 5–10 minutes with a slower version of the activity you plan to do. At the end, reduce the pace gradually; for walking, its example is another 5–10 minutes at a lower speed. [5]
Stop for chest pain, dizziness or faintness and seek medical help. If a health condition or injury affects your activity, get advice on building up safely. [3]
05 / Tools available now
Use numbers to answer a specific question.
These four tools are available. Use the output as a reference alongside your actual effort and the method's assumptions.
Running pace calculator
Convert between pace, distance and finish time when planning or reviewing a run.
VO2 max calculator
Explore estimates from the supported test methods. An estimated result is different from a laboratory measurement.
Walking calorie calculator
Estimate energy expenditure from inputs such as body mass, speed, time and incline. Treat the result as a model-based estimate.
06 / Read the whole protocol
An interval headline leaves important details out.
Keep the group, dose and study duration in view before copying an interval routine.
One 2007 randomized trial enrolled 246 middle-aged and older adults across three groups: interval walking, continuous walking and no walking training. The interval group was instructed to alternate three minutes of lower-intensity walking with three minutes of higher-intensity walking, repeating at least five cycles on at least four days a week over five months. [6]
That is more information than two numbers in a headline. It describes a research program in a particular population, not a universal starting routine. The same questions help you read claims about zone 2, HIIT or treadmill protocols.
07 / Explore the next question
Eleven focused guide topics, in preparation.
The category keeps the decisions together; each focused guide will explain its own question in more depth. All eleven topics below are in preparation. The four tools above are available now.
Start and choose
Build your base.
Choose a way to be active and understand how the week fits together.
- How to start running
- How much cardio per week
- Walking vs cycling
Effort and measurement
Understand the intensity.
Separate the training method from the number used to describe it.
- Zone 2 training
- HIIT vs LISS
- VO2 max explained
- Heart-rate zones explained
Cardio and lifting
Plan room for both.
Go deeper into combining endurance and strength work.
- Combining cardio and strength training
- Cardio before or after weights
Specific questions
Look beyond a headline.
A treadmill routine and a symptom question require different evidence.
- The 12-3-30 treadmill workout
- Why you may taste blood when running
Sources and review
The references behind the guidance.
General adult fitness information. Individual medical or rehabilitation advice takes priority.
- CDC. What Counts as Physical Activity for Adults. December 2023. Aerobic activity, weekly reference, intensity equivalents and strengthening.
- CDC. How to Measure Physical Activity Intensity. December 2025. Relative effort, activity examples and talk test.
- NIDDK. Tips to Keep Moving. Reviewed May 2017. Gradual progression, tracking, accessible choices and suitability advice.
- WHO. Physical activity. June 2024. Some activity is better than none and activity includes different forms of movement.
- American Heart Association. Warm Up, Cool Down. Reviewed January 2024. Gradual start and finish.
- Nemoto K, et al. Effects of high-intensity interval walking training on physical fitness and blood pressure in middle-aged and older people. Mayo Clinic Proceedings. 2007;82(7):803–811. PMID 17605959; abstract.
- American Heart Association. Target Heart Rates Chart. Reviewed August 2024. Average predictions and medication considerations.
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