Health & Fitness Calculators API
FreemiumBMI, daily calories (BMR/TDEE), ideal weight, body-fat percentage and water intake — using standard medical formulas.
Documentation
BMI, daily calories (BMR/TDEE), ideal weight, body-fat percentage and water intake.
What you get
- BMI with WHO and Asian categories
- Calories — BMR (Mifflin-St Jeor) and TDEE, with targets for weight loss or gain
- Ideal weight by four formulas (Devine, Robinson, Miller, Hamwi)
- Body fat by the US Navy method
- Daily water intake
Great for fitness and diet apps, gyms, health portals and wearables.
Quick start
Subscribe to a plan (the Basic plan is free), then call the API at https://health-fitness-calculators.p.apihiver.com with your key in the X-API-Key header:
curl "https://health-fitness-calculators.p.apihiver.com/v1/bmi?weight_kg=70&height_cm=175" \
-H "X-API-Key: YOUR_API_KEY"Endpoints
| Method | Path | What it does |
|---|---|---|
GET | /v1/bmi | Body Mass Index with WHO category (and Asian cut-offs) |
GET | /v1/calories | BMR and daily calorie needs (TDEE) with goal targets |
GET | /v1/ideal-weight | Ideal body weight by four common formulas |
GET | /v1/body-fat | Body-fat percentage (US Navy tape method) |
GET | /v1/water-intake | Suggested daily water intake |
Open the Endpoints tab to see every parameter, example request and example response, and to try the API live.
Errors
Every error is JSON with the same shape:
{"error": {"code": "INVALID_INPUT", "message": "weight_kg: Field required"}}| HTTP | Code | Meaning |
|---|---|---|
| 400 | INVALID_INPUT | A parameter is missing or has the wrong format — the message says which |
| 401 | UNAUTHORIZED | Missing or invalid X-API-Key |
| 429 | — | Plan quota or rate limit reached (see the X-RateLimit-* headers) |
| 502 / 503 / 504 | — | A data source or the API server is temporarily unavailable — retry after a few seconds |
Data & privacy
Data comes from standard published formulas, computed on our servers. Information only — not medical advice.
Health & Fitness Calculators API FAQ
- Is the Health & Fitness Calculators API free?
- Yes. The Basic plan is free and includes 500 requests per month — no card needed. Paid plans start at ₹299 per month for 10,000 requests.
- How much does the Health & Fitness Calculators API cost?
- Basic: free for 500 requests; Pro: ₹299/month for 10,000 requests; Ultra: ₹999/month for 50,000 requests; Mega: ₹2,499/month for 2,00,000 requests. Billing is monthly and you can cancel any time.
- How do I use the Health & Fitness Calculators API?
- Subscribe to a plan on APIHiver, create an API key in the Console, then send requests to https://health-fitness-calculators.p.apihiver.com with your key in the X-API-Key header. You can also try every endpoint in the browser playground first.
- What endpoints does the Health & Fitness Calculators API have?
- It has 5 endpoints: Body Mass Index with WHO category (and Asian cut-offs) (GET /v1/bmi); BMR and daily calorie needs (TDEE) with goal targets (GET /v1/calories); Ideal body weight by four common formulas (GET /v1/ideal-weight); Body-fat percentage (US Navy tape method) (GET /v1/body-fat); Suggested daily water intake (GET /v1/water-intake).
- What are the Health & Fitness Calculators API rate limits?
- Basic: 2 requests per second; Pro: 5 requests per second; Ultra: 10 requests per second; Mega: 20 requests per second. Monthly quotas depend on the plan; every response includes X-RateLimit headers showing what's left.
- Can I use one API key for the Health & Fitness Calculators API and other APIs?
- Yes. One APIHiver key works for every API you subscribe to, so you don't need a separate account or key per provider.
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Endpoints
5 endpoints — full list is in the sidebar on larger screens.