API · /healthcalc-api

Health Calculator API

healthy 3,713 Subscribers

A complete health & fitness calculator suite in one API: Body Mass Index with category and healthy-weight range, Basal Metabolic Rate (Mifflin-St Jeor and Harris-Benedict), Total Daily Energy Expenditure with weight-loss/gain calorie targets, macronutrient splits (balanced, low-carb, high-protein, keto, endurance) with fibre, U.S. Navy body-fat percentage, ideal body weight across four classic formulas (Devine, Robinson, Miller, Hamwi), and daily water intake. Every endpoint accepts GET query parameters or a JSON POST body and works in both metric and imperial units. All computation is done locally with established public-domain equations, so responses are instant and the service is always available. Ideal for fitness trackers, nutrition apps, telehealth and wellness dashboards.

#health #fitness #bmi #calorie #nutrition #calculator

api.oanor.com/healthcalc-api

Get an API key Try in playground → Contact provider

Machine-readable spec so AI agents can integrate this API.

/api/healthcalc-api/openapi.json

/api/healthcalc-api/llms.txt

Discovery: GET /api/index.json lists every API.

Health Calculator API — live data on the oanor API marketplace

API health

healthy

Uptime: 100.00%; Server probes · 24h
Avg latency: 74 ms; Server probes · 24h
Subscribers: 3,713; active
Total calls: 133; last 7 days

Full status page → · 21 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

500 calls / month
2 requests / second
Hard cap (429 above quota, no overage)
500 calculations/month, 2 req/s
All 7 calculators (BMI, BMR, TDEE, macros, body-fat, ideal-weight, water)
Metric & imperial units
No credit card

Basic

€4.00 /month

30,000 calls / month
5 requests / second
Hard cap (429 above quota, no overage)
30,000 calculations/month, 5 req/s
GET or JSON POST
Mifflin-St Jeor & Harris-Benedict BMR
Commercial use, email support

Pro

€12.00 /month

250,000 calls / month
15 requests / second
Hard cap (429 above quota, no overage)
250,000 calculations/month, 15 req/s
Goal-based calorie & macro targets
U.S. Navy body-fat & 4 ideal-weight formulas
Priority email support

Mega

€35.00 /month

2,000,000 calls / month
40 requests / second
Hard cap (429 above quota, no overage)
2,000,000 calculations/month, 40 req/s
High-volume for apps at scale
Maximum concurrency
Priority support

Built by

PremiumApi

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api.oanor.com/fruit-api

Disease & Public Health API

Global public-health data as an API, built on the open disease.sh dataset. Pull worldwide COVID-19 totals (cases, deaths, recovered, active, critical, tests and per-million rates), the same figures for any country (e.g. germany), continent (e.g. Europe) or US state (e.g. California), and the full sortable country list ranked by cases, deaths, tests and more. Track vaccine-coverage timelines globally or per country, and pull historical day-by-day case, death and recovery timelines for any country. Real data, no key needed upstream. Ideal for health dashboards, epidemiology research, data journalism and analytics.

api.oanor.com/disease-api

Sunscreen & UV API

Sun-safety maths as an API, computed locally and deterministically — the burn-time, SPF and reapplication numbers a sunscreen, weather or outdoor app keeps people safe with. The burntime endpoint estimates how long until sunburn from the Fitzpatrick skin type (1 very fair to 6 deeply pigmented), the UV index and the SPF: unprotected time is a skin-type base (type II around 15 minutes) scaled by 6 ÷ UV index, and protected time is that times the SPF — so fair type-II skin at UV 8 burns in about 11 minutes bare, or roughly 5½ hours under SPF 30, while very fair type-I skin in extreme UV 11 burns in 5 minutes. The spf endpoint flips it: the SPF needed = your desired minutes outdoors ÷ the unprotected time, with the reminder that real protection plateaus around SPF 30–50. The amount endpoint covers the part people get wrong — about 2 mg/cm², roughly 1 ounce (30 g, a shot glass) for a full adult body, reapplied every two hours — and totals the sunscreen for a day out. Everything is computed locally and deterministically, so it is instant and private. Ideal for sun-safety, weather, skincare and outdoor app developers, UV-alert and reminder tools, and wellness software. Pure local computation — no key, no third-party service, instant. Educational estimates, not medical advice. Live, nothing stored. 3 compute endpoints.

api.oanor.com/sunscreen-api

Body Metrics API

Anthropometric body-metrics maths as an API, computed locally and deterministically. The body-surface-area endpoint computes the body surface area in square metres from height and weight by five established formulas — Mosteller √(height·weight/3600), DuBois, Haycock, Gehan-George and Boyd — with their average, the figure used for chemotherapy dosing and cardiac index. The lean-mass endpoint estimates lean body mass from height, weight and sex by the Boer, James and Hume formulas, with the fat mass and body-fat percent that follow. The waist-ratio endpoint computes the waist-to-hip ratio (fat distribution) and the waist-to-height ratio — where keeping your waist under half your height is the simple healthy rule — with WHO-style risk bands. Heights and circumferences are in centimetres, weight in kilograms. Everything is computed locally and deterministically, so it is instant and private. Ideal for health, fitness, clinical, telemedicine and wellness app developers, body-composition and dosing tools, and health education. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is body surface area, lean mass and waist ratios; for BMI, body fat and ideal weight use a BMI API and for BMR and TDEE a BMR API.

api.oanor.com/bodymetrics-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Health Calculator API?

Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Health Calculator API with the x-oanor-key header. No credit card needed for the free tier.

What's the rate limit for Health Calculator API?

Free tier allows 1 request per second. Paid plans scale up to 50 requests per second on the Mega tier. Hard limits return HTTP 429 above the quota — no surprise overage charges.

How much does Health Calculator API cost?

Health Calculator API has a free tier with 100 calls / month. Paid plans start at €4.00 / month with higher quotas and faster rate limits.

Can I cancel my subscription anytime?

Yes. Plans are billed monthly and you can cancel anytime from your billing dashboard. No long-term contracts and no cancellation fee.

Is Health Calculator API GDPR-compliant?

All requests to Health Calculator API go through our EU-based gateway. Your upstream API key never leaves our server and no personal data is shared with the upstream provider beyond the request you send.

Custom headers

Language: Client:

Code snippets

curl https://api.oanor.com/healthcalc-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."

const res = await fetch("https://api.oanor.com/healthcalc-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();

$ch = curl_init("https://api.oanor.com/healthcalc-api/SOME_PATH");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
curl_setopt($ch, CURLOPT_HTTPHEADER, ["x-oanor-key: oanor_test_..."]);
$response = curl_exec($ch);

import requests
r = requests.get(
    "https://api.oanor.com/healthcalc-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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Health Calculator API

API health

Pricing

Built by

Related APIs

Fruit Nutrition API

Disease & Public Health API

Sunscreen & UV API

Body Metrics API

Frequently asked questions

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