# Target Heart Rate Calculator

> Estimate maximum heart rate and five training zones with percentage-of-maximum or Karvonen heart-rate-reserve calculations.

Page: https://askcalculators.com/calculator/target-heart-rate-calculator/
Definition: https://askcalculators.com/calculator/target-heart-rate-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/target-heart-rate-calculator/schema.json
Version: 2.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/target-heart-rate-calculator/?age=35&maxMethod=estimated&formula=tanaka&useKarvonen=1&restingHeartRate=60

## Inputs
- age: Age; type=number; required; default=35; min=10; max=100
- maxMethod: Maximum heart-rate input; type=select; required; default=estimated; values=estimated|tested
- formula: Age-based formula; type=select; required; default=tanaka; values=tanaka|fox|nes; showWhen=maxMethod:estimated
- testedMax: Tested maximum heart rate; type=number; required; default=185; min=60; max=240; showWhen=maxMethod:tested
- useKarvonen: Use resting heart rate (Karvonen method); type=checkbox; optional; default=true
- restingHeartRate: Resting heart rate; type=number; required; default=60; min=30; max=150; showWhen=useKarvonen:true

## Outputs
- maxHeartRate: Maximum heart rate; format=integer; primary
- zone2: Moderate zone (60–70%); format=text
- vigorous: Vigorous range (70–85%); format=text
- method: Zone method; format=text

## Formula
Age-based MHR uses the selected formula; percentage method = MHR×intensity; Karvonen = resting HR + (MHR−resting HR)×intensity.

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.

Notice: Heart-rate zones are estimates. Medicines, medical conditions, heat, altitude, and fitness can change a safe or appropriate range.