{
  "slug": "max-hr-220",
  "title": "Max Heart Rate Calculator (220 Minus Age)",
  "category": "Heart Rate Zones",
  "category_slug": "heart-rate-zones",
  "tier": 1,
  "summary": "Estimate maximum heart rate using the classic 220-minus-age formula.",
  "description": "This calculator estimates maximum heart rate using the classic 220-minus-age formula, a population-derived equation widely adopted since the 1970s. It requires only age as an input and returns an estimated max heart rate in beats per minute, along with moderate-intensity (50–70%) and vigorous-intensity (70–85%) training zones. The formula applies a linear age decline with a standard error of ±10–12 bpm, making it a general screening tool rather than a personalised physiological measurement.",
  "page_url": "https://fitmetriclab.com/en/tools/heart-rate-zones/max-hr-220/",
  "api_url": "https://fitmetriclab.com/api/tools/max-hr-220.json",
  "formula": {
    "id": "max_hr_220",
    "expression": "\\text{MHR} = 220 - a",
    "variables": [
      {
        "symbol": "a",
        "description": "Age in years"
      }
    ]
  },
  "inputs": [
    {
      "id": "age",
      "label": "Age",
      "type": "number",
      "unit": "yrs",
      "default": 30,
      "min": 10,
      "max": 100,
      "step": 1
    }
  ],
  "worked_example": {
    "inputs": {
      "age": 30
    },
    "expected_output": "190 bpm"
  },
  "result_summary_template": "For a person aged {age} years, the 220-minus-age formula estimates maximum heart rate at {result}.",
  "methodology": "Maximum Heart Rate = 220 − age. This population-derived formula was widely adopted in the 1970s based on age-related averages. The constant 220 and linear age decline are empirical approximations rather than physiological laws; standard error is ±10–12 bpm.",
  "sources": [
    {
      "label": "Fox SM, Naughton JP, Haskell WL. Physical activity and the prevention of coronary heart disease. Annals of Clinical Research. 1971;3(6):404-432.",
      "url": "https://pubmed.ncbi.nlm.nih.gov/4945367/"
    },
    {
      "label": "Tanaka H, Monahan KD, Seals DR. Age-predicted maximal heart rate revisited. Journal of the American College of Cardiology. 2001;37(1):153-156.",
      "url": "https://doi.org/10.1016/S0735-1097(00)01054-8"
    },
    {
      "label": "Robergs RA, Landwehr R. The surprising history of the 'HRmax=220-age' equation. Journal of Exercise Physiology Online. 2002;5(2):1-10.",
      "url": "https://www.asep.org/asep/asep/Robergs2.pdf"
    }
  ],
  "faqs": [
    {
      "question": "Why does this calculator only ask for age?",
      "answer": "The 220-minus-age formula is based solely on chronological age. It does not incorporate sex, training status, body composition, or other variables. Alternative formulas exist that include additional factors, but this tool implements the original single-variable equation."
    },
    {
      "question": "How accurate is the 220-minus-age formula?",
      "answer": "Population-level standard deviation is approximately ±10–12 bpm. Individual maximum heart rates frequently fall outside this range. Direct measurement via graded exercise test provides a personalized value rather than a statistical estimate."
    },
    {
      "question": "What do the moderate and vigorous percentages represent?",
      "answer": "The moderate zone (50–70%) and vigorous zone (70–85%) reflect intensity classifications used in public health guidelines. These percentages are applied to the estimated maximum heart rate to define target ranges for different exercise intensities."
    },
    {
      "question": "Does maximum heart rate indicate fitness level?",
      "answer": "Maximum heart rate is primarily age-dependent and does not correlate strongly with aerobic capacity or fitness. Two individuals with identical max heart rates can have vastly different VO₂max values, lactate thresholds, and endurance performance."
    },
    {
      "question": "Can medications affect my actual maximum heart rate?",
      "answer": "Beta-blockers, calcium channel blockers, and certain other medications directly lower heart rate response to exercise. The 220-minus-age formula does not account for pharmacological effects, so actual maximum may differ significantly from the calculated estimate."
    }
  ],
  "related_tools": [
    {
      "slug": "target-heart-rate",
      "title": "Target Heart Rate Calculator",
      "api_url": "https://fitmetriclab.com/api/tools/target-heart-rate.json",
      "page_url": "https://fitmetriclab.com/en/tools/heart-rate-zones/target-heart-rate/"
    },
    {
      "slug": "heart-rate-recovery",
      "title": "Heart Rate Recovery Calculator",
      "api_url": "https://fitmetriclab.com/api/tools/heart-rate-recovery.json",
      "page_url": "https://fitmetriclab.com/en/tools/heart-rate-zones/heart-rate-recovery/"
    },
    {
      "slug": "hr-zones-karvonen",
      "title": "Heart Rate Zones (Karvonen Method)",
      "api_url": "https://fitmetriclab.com/api/tools/hr-zones-karvonen.json",
      "page_url": "https://fitmetriclab.com/en/tools/heart-rate-zones/hr-zones-karvonen/"
    }
  ],
  "last_updated": "2026-04-22",
  "price": {
    "value": 0,
    "currency": "USD"
  },
  "runs_in_browser": true,
  "disclaimer": "Educational estimate produced from a published formula. Not medical, nutritional, or training advice. Calculations are deterministic — apply the formula to the inputs to reproduce the result."
}