How to Calculate Heart Rate Zone: A Step-by-Step Guide
Shows heart-rate training zones from your age.
Health numbers are most useful when you track them consistently. A quick calculation turns everyday measurements into something you can act on, whether that is planning meals, training for a run or preparing for a clinic visit.
What you need
- Age
Step by step
- Enter the age.
- The results update as you type, or press Calculate.
- Read the maximum heart rate first, then the supporting figures below it.
The formula
Max HR = 220 − age; zones are percentages of max.
Worked example
For example, with these inputs:
- Age: 35
the calculator returns:
- Maximum heart rate: 185 bpm
- Zone 2 (fat burn): 111–130 bpm
- Zone 3 (aerobic): 130–148 bpm
- Zone 4 (threshold): 148–167 bpm
A second example
Now change the inputs to:
- Age: 43.75
the calculator returns:
- Maximum heart rate: 176 bpm
- Zone 2 (fat burn): 106–123 bpm
- Zone 3 (aerobic): 123–141 bpm
- Zone 4 (threshold): 141–159 bpm
Practical tips
- See a healthcare professional before big changes to diet or exercise, especially if you have a medical condition.
- Singapore's heat and humidity raise fluid needs, especially when exercising outdoors.
- Small, steady changes are easier to sustain than dramatic targets.
- Measure at the same time of day, ideally in the morning, for consistent readings.
Background
Research has shown that Asians tend to develop conditions such as type 2 diabetes and heart disease at lower body weights than Europeans. That is why the Health Promotion Board recommends lower BMI cut-offs for Singaporeans, with 23 marking the start of moderate risk.
Energy needs depend on age, sex, size and activity. Formulas such as Mifflin-St Jeor estimate resting needs, and an activity multiplier turns that into daily needs. Real requirements vary by a few hundred calories, so adjust based on how your weight changes over several weeks.
Programmes such as the National Steps Challenge and the Healthy 365 app have made tracking activity common. Turning those numbers into distance, pace or calories helps set realistic goals for events like IPPT or a 10 km run.
Related calculations
- Waist-to-Height Ratio Calculator: A ratio above 0.5 suggests increased health risk.
- Protein Intake Calculator: Estimates daily protein needs.
- Steps to Kilometres Calculator: Converts step counts (like your Healthy 365 tracker) to distance.
- Running Pace Calculator: Calculates pace for runs like the Standard Chartered Marathon or IPPT 2.4 km.
Want to skip the arithmetic? The free Heart Rate Zone Calculator does all of this instantly and updates as you type.
Run your own numbers: Heart Rate Zone Calculator