---
title: "Heart Rate Zone Calculator"
method: GET
path: "/api/calc/heart-rate-zone-calculator"
tags: ["Health"]
---

# Heart Rate Zone Calculator

`GET /api/calc/heart-rate-zone-calculator`

## Request

- Base URL: `https://calcbright.com`
- URL: `https://calcbright.com/api/calc/heart-rate-zone-calculator`
- Auth: none declared

Zone 2 for a 30-year-old is 114–133 bpm by 220 − age. Get all five training zones from your age, using 220 − age or Tanaka, or personalise them with resting HR.

## Query parameters

- `age` number: Age (years)
- `resting` number: Resting heart rate (optional) (bpm) Add it to use the Karvonen (heart-rate reserve) method.
- `formula` 'fox' | 'tanaka': Max heart rate formula

## Response `200`

Calculation result

- CalcOutput
  - `ok` boolean
  - `tool` string
  - `name` string
  - `url` string: Open this link to see the full calculation
  - `inputs` object
  - `summary` string: Plain-text answer
  - `details` string
  - `result` object
  - `errors` object

## Other responses

- `400`: Invalid input (see errors)

---

[API](https://skmtc.dev/calcbright/apis/calcbright-calculator-api.md) · [All operations](https://skmtc.dev/calcbright/apis/calcbright-calculator-api/llms.txt) · [OpenAPI document](https://skmtc.dev/calcbright/apis/calcbright-calculator-api/revisions/f58229e56e58?raw)