Max heart rate (Tanaka / Fox) API

Estimate maximum heart rate from age via Tanaka (208 − 0.7·age) and the classic Fox 220−age formula. Answers 'what's my max heart rate', 'max HR for age 30', 'Tanaka maximum heart rate', '220 minus age'.

Price$0.01per request

MethodPOST

Route/v1/health/max-heart-rate

StatusLive

MIME typeapplication/json

Rate limit120/minute

CacheNo cache

healthmax-heart-ratetanakafoxcardiohrfitnesscalculator

API URLhttps://x402.hexl.dev/v1/health/max-heart-rate

Integration docs

Example request

{
  "ageYears": 30
}

Example response

{
  "maxHeartRateBpm": 187,
  "method": "Tanaka (208 - 0.7*age)",
  "tanaka": 187,
  "fox": 190,
  "inputs": {
    "ageYears": 30
  }
}

Input schema

{
  "type": "object",
  "required": [
    "ageYears"
  ],
  "properties": {
    "ageYears": {
      "type": "number",
      "examples": [
        30
      ]
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}