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API · /medcalc-api

Clinical Calculator API

healthy 3,661 Subscribers

Standard clinical and nursing calculators as an API — the everyday medical maths, computed locally. The bsa endpoint computes body surface area from weight and height by the Mosteller, Du Bois and Haycock formulas (used for chemotherapy and drug dosing). The egfr endpoint estimates kidney function from serum creatinine, age and sex using the race-free CKD-EPI 2021 equation, and the Cockcroft-Gault creatinine clearance when a weight is given (creatinine in mg/dL or µmol/L). The drip-rate endpoint computes an IV infusion's drops per minute and millilitres per hour from the volume, time and drop factor. The gcs endpoint scores the Glasgow Coma Scale from its eye, verbal and motor components and gives the severity band. Everything is computed locally and deterministically, so it is instant and private. INFORMATIONAL ONLY — not medical advice; always verify with clinical judgement and approved tools. Ideal for healthcare and nursing apps, clinical decision-support prototypes, medical education, and EHR tooling. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 4 endpoints. This is clinical maths; for drug reference data use a drug API and for BMI, BMR and calories use a health-calculator API.

#clinical #egfr #bsa #medical #healthcare #developer-tools
api.oanor.com/medcalc-api
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Machine-readable spec so AI agents can integrate this API.

/api/medcalc-api/openapi.json
/api/medcalc-api/llms.txt

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
82 ms
Server probes · 24h
Subscribers
3,661
active
Total calls
60
last 7 days
status Full status page → · 30 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 8,835 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 8,835 calls/month
  • 2 req/sec
  • BSA + eGFR + drip rate + GCS
  • No credit card
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Starter

€10.35 /month

  • 18,450 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 18.45k calls/month
  • 8 req/sec
  • CKD-EPI 2021 + Cockcroft-Gault
  • Email support
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Pro

€30.25 /month

  • 234,500 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 234.5k calls/month
  • 20 req/sec
  • Healthcare / EHR pipelines
  • Priority support
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Mega

€68.25 /month

  • 1,215,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 1.215M calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

Ideal Body Weight API

Ideal body weight and clinical body-metric maths as an API, computed locally and deterministically. The ideal endpoint computes ideal body weight from height and sex by the four standard formulas — Devine (the clinical standard for drug dosing), Robinson, Miller and Hamwi — each adding a per-inch increment for every inch above 5 ft, plus their average; a 5 ft 10 in (178 cm) man comes out at 73.0 kg by Devine. The adjusted endpoint computes the adjusted body weight used to dose drugs in overweight patients, ABW = IBW + 0.4·(actual − IBW), from height, sex and actual weight. The bsa endpoint computes body surface area — central to chemotherapy and cardiac-index dosing — by the Mosteller (√(height·weight/3600)), Du Bois and Haycock formulas, so a 180 cm, 80 kg adult is about 2.0 m². Height is accepted in centimetres or inches and weight in kilograms. Everything is computed locally and deterministically, so it is instant and private. Ideal for digital-health, EHR, pharmacy, clinical-decision-support, telemedicine and medical-education app developers, dosing and body-metric tools, and health software. These are clinical estimation formulas, not a substitute for professional medical judgement. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is ideal/adjusted weight and body surface area; for body-mass index use a BMI API.

api.oanor.com/idealweight-api

ClinicalTrials API

Search the global clinical-trials registry as an API, powered by the U.S. NIH ClinicalTrials.gov database of 500,000+ studies. Find trials by medical condition, intervention or drug, free-text term, location and recruitment status (recruiting, completed, active, terminated and more), with paging across results, or pull a full study by its NCT id. Each record carries the title, overall status, study type and phases, conditions studied, interventions, lead sponsor, enrollment count, start and completion dates, eligibility criteria (sex, age range, healthy-volunteer policy) and the list of participating sites with city and country. Ideal for patient-matching and recruitment tools, pharma and biotech competitive intelligence, medical research dashboards, health portals and academic analysis.

api.oanor.com/clinicaltrials-api

RxNorm API

US drug terminology as an API, powered by the U.S. National Library of Medicine's RxNav / RxNorm service. Resolve any drug or medication name to its RxNorm concept identifier (RxCUI); read a concept's properties (preferred name, term type, synonym, UMLS id); find all the related drug products for a name grouped by term type (brand names, ingredients, clinical and branded drugs, dose forms); walk related concepts by term type; list the drug classes a medicine belongs to across ATC, VA, mechanism of action, physiologic effect and chemical structure; and run spelling-tolerant search that returns candidate RxCUIs with match scores for misspelled or partial names. The standardised vocabulary that underpins US electronic health records and e-prescribing. Ideal for EHR and pharmacy systems, medication reconciliation, clinical-decision-support and health apps, and drug-data normalisation pipelines. RxCUIs are numeric.

api.oanor.com/rxnorm-api

ICD-10 Codes API

The ICD-10-CM diagnosis code system as an API — 71,000+ International Classification of Diseases (10th revision, Clinical Modification) codes used in healthcare, billing and insurance. Look up any code (e.g. E11.9 → Type 2 diabetes mellitus without complications), search the classification by condition, or browse every code in a 3-character category. Ideal for EHR/EMR systems, medical billing, claims and health-tech tooling.

api.oanor.com/icd10-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Clinical Calculator API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Clinical Calculator API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Clinical 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 Clinical Calculator API cost?
Clinical Calculator API has a free tier with 100 calls / month. Paid plans start at €10.35 / 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 Clinical Calculator API GDPR-compliant?
All requests to Clinical 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.

Pick an endpoint from the list on the left to see its details and try it.

Code snippets

Sign up to get an API key, then call any path under your slug.

curl https://api.oanor.com/medcalc-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/medcalc-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/medcalc-api/SOME_PATH");
curl_setopt($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/medcalc-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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