{
  "slug": "target-heart-rate",
  "title": "Target Heart Rate Calculator",
  "category": "Heart Rate Zones",
  "category_slug": "heart-rate-zones",
  "tier": 2,
  "summary": "Calculate target heart rate zones from maximum heart rate and exercise intensity.",
  "description": "This calculator estimates target heart rate zones by multiplying maximum heart rate (MHR) by a selected exercise intensity percentage, using the percentage-of-MHR method. It accepts maximum heart rate in beats per minute and an intensity level (Light: 50–60%, Moderate: 60–75%, or Vigorous: 75–90%), then returns the corresponding target heart rate for that intensity band. The method follows American College of Sports Medicine guidelines for exercise intensity classification and provides a simple approach to setting aerobic training zones without requiring resting heart rate data.",
  "page_url": "https://fitmetriclab.com/en/tools/heart-rate-zones/target-heart-rate/",
  "api_url": "https://fitmetriclab.com/api/tools/target-heart-rate.json",
  "formula": {
    "id": "target_heart_rate",
    "expression": "\\text{THR} = \\text{MHR} \\times i",
    "variables": [
      {
        "symbol": "\\text{MHR}",
        "description": "Maximum heart rate in bpm"
      },
      {
        "symbol": "i",
        "description": "Target intensity (decimal)"
      }
    ]
  },
  "inputs": [
    {
      "id": "mhr",
      "label": "Max HR",
      "type": "number",
      "unit": "bpm",
      "default": 190,
      "min": 100,
      "max": 230,
      "step": 1
    },
    {
      "id": "intensity",
      "label": "Intensity (% of MHR)",
      "type": "select",
      "unit": null,
      "default": 70,
      "options": [
        {
          "value": 55,
          "label": "Light (50–60% MHR)"
        },
        {
          "value": 70,
          "label": "Moderate (60–80% MHR)"
        },
        {
          "value": 85,
          "label": "Vigorous (80–90% MHR)"
        }
      ]
    }
  ],
  "worked_example": {
    "inputs": {
      "mhr": 190,
      "intensity": 70
    },
    "expected_output": "133 bpm"
  },
  "result_summary_template": "For a maximum heart rate of {mhr} bpm at {intensity} intensity, the percentage-of-MHR method estimates a target heart rate of {result}.",
  "methodology": "Multiplies maximum heart rate (MHR) by a selected intensity percentage using the percentage-of-MHR method. Light intensity corresponds to 50–60% MHR, Moderate to 60–75%, and Vigorous to 75–90%. The calculator returns the midpoint value for each band, derived from American College of Sports Medicine guidelines for exercise intensity classification.",
  "sources": [
    {
      "label": "American College of Sports Medicine. ACSM's Guidelines for Exercise Testing and Prescription. 11th ed. Wolters Kluwer; 2021.",
      "url": "https://www.acsm.org/"
    },
    {
      "label": "Tanaka H, Monahan KD, Seals DR. Age-predicted maximal heart rate revisited. J Am Coll Cardiol. 2001;37(1):153-156.",
      "url": "https://pubmed.ncbi.nlm.nih.gov/11153730/"
    },
    {
      "label": "Swain DP, Leutholtz BC, King ME, Haas LA, Branch JD. Relationship between % heart rate reserve and % VO2 reserve in treadmill exercise. Med Sci Sports Exerc. 1998;30(2):318-321.",
      "url": "https://pubmed.ncbi.nlm.nih.gov/9502362/"
    }
  ],
  "faqs": [
    {
      "question": "What is the difference between percentage-of-MHR and heart rate reserve methods?",
      "answer": "Percentage-of-MHR multiplies maximum heart rate by an intensity fraction. Heart rate reserve (Karvonen) subtracts resting HR from MHR, multiplies by intensity, then adds resting HR back. The reserve method often yields slightly higher target zones and accounts for baseline cardiac function."
    },
    {
      "question": "How is maximum heart rate best determined?",
      "answer": "Laboratory maximal exercise testing on a treadmill or cycle ergometer with ECG monitoring provides the most accurate MHR. Age-prediction equations (e.g., 220 − age) offer convenience but carry individual error of ±10–15 bpm. Field tests and wearable devices can estimate MHR but may underestimate true values if effort is submaximal."
    },
    {
      "question": "Why do the intensity bands use ranges instead of single percentages?",
      "answer": "Exercise intensity exists along a continuum. Light, Moderate, and Vigorous classifications reflect American College of Sports Medicine categories; each band spans 10–15 percentage points to accommodate individual variability in ventilatory threshold, lactate accumulation, and perceived exertion at a given heart rate."
    },
    {
      "question": "Can medications affect target heart rate accuracy?",
      "answer": "Beta-blockers, calcium channel blockers, and some antiarrhythmics lower maximum and submaximal heart rates, invalidating standard percentage calculations. Sympathomimetics and stimulants may elevate heart rate independently of metabolic demand. Individuals on cardiovascular medications should use rate of perceived exertion or talk-test methods alongside HR monitoring."
    },
    {
      "question": "Do environmental conditions change target heart rate zones?",
      "answer": "Heat, humidity, and altitude elevate heart rate at a given workload due to increased cardiovascular strain and reduced oxygen availability. The target HR calculated from MHR remains numerically unchanged, but the metabolic intensity and perceived effort at that heart rate will differ from temperate sea-level conditions."
    }
  ],
  "related_tools": [
    {
      "slug": "max-hr-220",
      "title": "Max Heart Rate Calculator (220 Minus Age)",
      "api_url": "https://fitmetriclab.com/api/tools/max-hr-220.json",
      "page_url": "https://fitmetriclab.com/en/tools/heart-rate-zones/max-hr-220/"
    },
    {
      "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."
}