Understanding your target heart rate zone is crucial for effective and safe exercise. It helps you push yourself sufficiently to gain cardiovascular benefits without overexerting yourself. This calculator will help you determine your target heart rate range based on your age.
Common zones are 50-60% for moderate intensity and 70-85% for vigorous intensity.
How to Calculate Your Target Heart Rate
Your target heart rate zone is a range of heartbeats per minute (bpm) that your heart should aim for during aerobic exercise to achieve maximum cardiovascular benefits. There are two main zones typically used:
Moderate Intensity Zone: Typically 50% to 69% of your maximum heart rate.
Vigorous Intensity Zone: Typically 70% to 85% of your maximum heart rate.
The Karvonen Formula (More Accurate Method)
While the simpler method uses a percentage of your maximum heart rate, the Karvonen formula also takes into account your resting heart rate, providing a more personalized target zone.
Estimate Maximum Heart Rate (MHR): The most common estimate is 220 minus your age.
Calculate Heart Rate Reserve (HRR): HRR = MHR – Resting Heart Rate (RHR). You'll need to know your resting heart rate.
For simplicity, this calculator uses a direct percentage of your estimated maximum heart rate. If you know your resting heart rate, you can use the Karvonen formula for a more precise calculation.
Example Calculation:
Let's say you are 30 years old and want to exercise at 75% intensity.
Estimated Maximum Heart Rate = 220 – 30 = 190 bpm
Target Heart Rate = 190 bpm × 0.75 = 142.5 bpm
So, your target heart rate for vigorous intensity exercise would be around 143 bpm.
function calculateTargetHeartRate() {
var ageInput = document.getElementById("age");
var intensityInput = document.getElementById("intensity");
var resultDiv = document.getElementById("result");
var age = parseFloat(ageInput.value);
var intensity = parseFloat(intensityInput.value);
if (isNaN(age) || age <= 0) {
resultDiv.innerHTML = "Please enter a valid age.";
return;
}
if (isNaN(intensity) || intensity 100) {
resultDiv.innerHTML = "Please enter a valid intensity percentage (0-100).";
return;
}
var maxHeartRate = 220 – age;
var targetHeartRate = maxHeartRate * (intensity / 100);
resultDiv.innerHTML =
"For an age of " + age + " and an intensity of " + intensity + "%:" +
"Estimated Maximum Heart Rate: " + maxHeartRate.toFixed(0) + " bpm" +
"Your Target Heart Rate is approximately: " + targetHeartRate.toFixed(0) + " bpm";
}
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