Note: The standard formula (220 – Age) would calculate your max HR as 0 BPM. The Gulati formula used above is specifically researched for women.
Your Training Zones
Zone
Intensity
Heart Rate Range (BPM)
function calculateFemaleHR() {
var ageInput = document.getElementById('inputAge');
var age = parseFloat(ageInput.value);
var resultArea = document.getElementById('result-area');
// Validation
if (isNaN(age) || age 120) {
alert("Please enter a valid age between 1 and 120.");
return;
}
// 1. Gulati Formula for Women: 206 – (0.88 * Age)
// Source: Circulation (2010), "Heart Rate Response to Exercise Stress Testing in Asymptomatic Women"
var maxHRGulati = 206 – (0.88 * age);
var roundedMaxHR = Math.round(maxHRGulati);
// 2. Standard Formula (Fox): 220 – Age (for comparison)
var maxHRStandard = 220 – age;
// Display Max HR
document.getElementById('displayMaxHR').innerHTML = roundedMaxHR + " BPM";
document.getElementById('displayStandardHR').innerText = maxHRStandard;
// Calculate Zones based on Gulati Max HR
// Zone 1: Very Light (50-60%)
// Zone 2: Light (60-70%)
// Zone 3: Moderate (70-80%)
// Zone 4: Hard (80-90%)
// Zone 5: Maximum (90-100%)
var zone1_min = Math.round(roundedMaxHR * 0.50);
var zone1_max = Math.round(roundedMaxHR * 0.60);
var zone2_min = Math.round(roundedMaxHR * 0.60);
var zone2_max = Math.round(roundedMaxHR * 0.70);
var zone3_min = Math.round(roundedMaxHR * 0.70);
var zone3_max = Math.round(roundedMaxHR * 0.80);
var zone4_min = Math.round(roundedMaxHR * 0.80);
var zone4_max = Math.round(roundedMaxHR * 0.90);
var zone5_min = Math.round(roundedMaxHR * 0.90);
var zone5_max = roundedMaxHR;
var tableHtml = `
Zone 1
Warm Up / Recovery (50-60%)
${zone1_min} – ${zone1_max} bpm
Zone 2
Fat Burning (60-70%)
${zone2_min} – ${zone2_max} bpm
Zone 3
Aerobic / Cardio (70-80%)
${zone3_min} – ${zone3_max} bpm
Zone 4
Anaerobic / Hard (80-90%)
${zone4_min} – ${zone4_max} bpm
Zone 5
Maximum Effort (90-100%)
${zone5_min} – ${zone5_max} bpm
`;
document.getElementById('zonesBody').innerHTML = tableHtml;
// Show result area
resultArea.style.display = "block";
}
Why Use a Specific Female Max Heart Rate Calculator?
For decades, the fitness industry relied almost exclusively on the "Fox Formula" ($220 – Age$) to estimate maximum heart rate. While simple, research conducted at Northwestern Medicine in 2010 revealed that this traditional formula significantly overestimates maximum heart rate for women.
The study, published in the journal Circulation, analyzed over 5,000 asymptomatic women and derived a new formula specifically for female physiology, known as the Gulati Formula. This calculator uses that gender-specific equation to provide a safer and more accurate baseline for your training intensities.
The Formula Difference:
Standard (Men/Unisex): $220 – Age$ Female Specific (Gulati): $206 – (0.88 \times Age)$
Understanding Your Heart Rate Zones
Knowing your maximum heart rate (HRmax) is only the first step. The real value comes from applying this number to training zones to achieve specific fitness goals.
Zone 1: Warm Up & Recovery (50-60%)
This is a very low-intensity zone used for warming up before a workout or cooling down afterwards. It helps with blood flow and muscle recovery without placing significant stress on the cardiovascular system.
Zone 2: Fat Burning (60-70%)
In this zone, the body becomes efficient at using fat as a primary fuel source. It is excellent for building endurance and general cardiovascular health. You should be able to hold a conversation easily while training in this zone.
Zone 3: Aerobic Conditioning (70-80%)
This is the "sweet spot" for improving aerobic capacity. Training here improves your heart's ability to pump blood and your lungs' capacity to utilize oxygen. Breathing becomes heavier, and speaking in full sentences becomes difficult.
Zone 4: Anaerobic Threshold (80-90%)
Training in Zone 4 improves your ability to sustain high-speed efforts and tolerate lactic acid buildup. This is often used for high-intensity interval training (HIIT) and increases performance speed.
How Accurate Is This Calculator?
While the Gulati formula is statistically more accurate for women than the standard formula, it remains an estimation. Genetics, fitness level, and medical history can cause your actual maximum heart rate to deviate from the formula.
For the most precise measurement, a graded exercise stress test performed by a cardiologist or sports physiologist is recommended. However, for most recreational athletes and fitness enthusiasts, this calculator provides a highly effective baseline for structuring workout intensity.