Heart rate zones

Calculate heart rate zones with clear inputs and assumptions.

Your inputs stay in your browser. Displayed results are rounded to a maximum of 12 significant digits.

Method and assumptions

Method version 1.0.0 · Updated October 17, 2026

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Formula: Calculate heart rate zones with clear inputs and assumptions.

Calculate heart rate zones with clear inputs and assumptions.

Results are estimates where noted and depend on the entered assumptions.

These short examples use the same inputs and core calculation as this tool. Adapt validation and formatting to your application.

JavaScript

const maxHeartRate = 190;
console.log([0.5, 0.6, 0.7, 0.8, 0.9].map(p => Math.round(maxHeartRate * p))); // zone boundaries

TypeScript

const maxHeartRate = 190;
const zones: number[] = [0.5, 0.6, 0.7, 0.8, 0.9].map(p => Math.round(maxHeartRate * p));
console.log(zones);

Python

max_hr = 190
print([round(max_hr * p) for p in (0.5, 0.6, 0.7, 0.8, 0.9)])  # zone boundaries

Java

int maxHr = 190;
System.out.println(java.util.stream.DoubleStream.of(.5,.6,.7,.8,.9).map(p -> Math.round(maxHr*p)).toArray());

int maxHr = 190;
Console.WriteLine(string.Join(", ", new[] {.5,.6,.7,.8,.9}.Select(p => Math.Round(maxHr*p))));