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API · /bac-api

Blood Alcohol Calculator API

healthy 3,395 Subscribers

Blood-alcohol estimation as an API, using the Widmark equation, computed locally and deterministically. The estimate endpoint works out the peak and current blood-alcohol concentration — in both per mille (‰) and percent (%) — from the alcohol consumed, body weight, sex and the time elapsed since drinking, and tells you roughly how long until you are sober or back under a chosen legal limit. Alcohol can be given as grams, as US standard drinks, or as a drink volume and ABV. The drink endpoint is a standard-drink calculator: from a volume and ABV it returns the grams of pure alcohol, US standard drinks (14 g), UK units (10 ml) and EU standard drinks (10 g). The sober endpoint estimates the time for a current BAC to fall to zero or to a target limit at a chosen elimination rate. Everything is computed locally and deterministically, so it is instant and private. IMPORTANT: this is a rough estimate for educational use only — real blood-alcohol depends on many personal and situational factors. Never use it to decide whether it is safe or legal to drive; when in doubt, do not drive. Ideal for educational and harm-reduction tools, hospitality and event apps, and personal drink trackers. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is blood-alcohol maths; for the calories or nutrition of drinks use a food or nutrition API.

#blood-alcohol #bac #widmark #alcohol #health #developer-tools
api.oanor.com/bac-api
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Machine-readable spec so AI agents can integrate this API.

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

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

API health

healthy
Uptime
100.00%
Server probes · 24h
Avg latency
84 ms
Server probes · 24h
Subscribers
3,395
active
Total calls
44
last 7 days
status Full status page → · 20 probes/24h

Pricing

Pick a tier — billed monthly, cancel anytime.

Free

Free

  • 9,235 calls / month
  • 2 requests / second
  • Hard cap (429 above quota, no overage)
  • 9,235 calls/month
  • 2 req/sec
  • Estimate + drink + sober
  • No credit card
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Starter

€10.75 /month

  • 18,850 calls / month
  • 8 requests / second
  • Hard cap (429 above quota, no overage)
  • 18.85k calls/month
  • 8 req/sec
  • US drinks / UK units / EU
  • Email support
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Pro

€30.65 /month

  • 238,500 calls / month
  • 20 requests / second
  • Hard cap (429 above quota, no overage)
  • 238.5k calls/month
  • 20 req/sec
  • Hospitality / harm-reduction pipelines
  • Priority support
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Mega

€68.65 /month

  • 1,235,000 calls / month
  • 50 requests / second
  • Hard cap (429 above quota, no overage)
  • 1.235M calls/month
  • 50 req/sec
  • Platform scale
  • Dedicated SLA
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Related APIs

Other APIs with overlapping tags.

Alcohol & ABV API

Alcohol and cocktail maths as an API, computed locally and deterministically — the ABV, dilution and standard-drink numbers a bartender, brewer or drinks app works out behind the bar. The abv endpoint mixes a drink: pass the ingredients as a volume:abv list and it returns the final alcohol by volume = (sum of volume × ABV) ÷ total volume, so a Negroni-style 2 parts at 40 %, 1 at 20 % and 1 mixer at 0 % lands at 25 % ABV (50 US proof), with mixers diluting the result. The dilution endpoint models ice melt and stirring, which add water and drop the strength: final volume = volume × (1 + dilution) and ABV falls by the same factor while the alcohol itself is unchanged, so a 4 oz stirred drink at 25 % with 25 % dilution becomes 5 oz at 20 % — stirred drinks pick up roughly 20–25 %, shaken a little more. The standard endpoint counts the dose: pure alcohol = volume × ABV, then a US standard drink is 14 grams (0.6 fl oz) and a UK unit is 10 ml of pure alcohol, so a 12 fl oz beer at 5 % is one standard drink (14 g, 1.77 UK units) and a 5 fl oz glass of 12 % wine is one too. Everything is computed locally and deterministically, so it is instant and private. Ideal for bartending, brewing, beverage, hospitality and responsible-drinking app developers, cocktail-builder and drink-tracker tools, and bar-menu calculators. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 compute endpoints. For drink recipes use a cocktails database API.

api.oanor.com/abv-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

Blood Type API

Blood-type compatibility as an API, covering the ABO and Rh(D) systems, computed locally and deterministically. The compatibility endpoint says whether a given donor can give to a given recipient, for both red blood cells and plasma — the red-cell rule being that the donor's antigens must be a subset of the recipient's (Rh included), and plasma being the reverse and ignoring Rh. The info endpoint describes a blood type: the antigens it carries, the antibodies in its plasma, every type it can receive red cells from and donate red cells to, who it can give plasma to, whether it is a universal red-cell donor (O−), universal red-cell recipient (AB+) or universal plasma donor (AB), and its approximate US population frequency. The donors endpoint lists every compatible donor type for a recipient, for red cells or plasma. Blood types are accepted in many forms (O-, O neg, AB positive, …). Everything is computed locally and deterministically, so it is instant and private. This is educational only — real transfusion requires laboratory cross-matching and clinical judgement, and it is not medical advice. Ideal for medical-education and first-aid apps, blood-donation and health tools, and quiz and reference sites. Pure local computation — no key, no third-party service, instant. Live, nothing stored. 3 endpoints. This is ABO/Rh compatibility; for a drug reference database use a drug API.

api.oanor.com/bloodtype-api

Frequently asked questions

Quick answers about pricing, quotas, and integration.

How do I get an API key for Blood Alcohol Calculator API?
Sign up for free at oanor.com, generate an API key from the developer dashboard, and call Blood Alcohol Calculator API with the x-oanor-key header. No credit card needed for the free tier.
What's the rate limit for Blood Alcohol 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 Blood Alcohol Calculator API cost?
Blood Alcohol Calculator API has a free tier with 100 calls / month. Paid plans start at €10.75 / 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 Blood Alcohol Calculator API GDPR-compliant?
All requests to Blood Alcohol 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/bac-api/SOME_PATH \
  -H "x-oanor-key: oanor_test_..."
const res = await fetch("https://api.oanor.com/bac-api/SOME_PATH", {
  headers: { "x-oanor-key": "oanor_test_..." }
});
const data = await res.json();
$ch = curl_init("https://api.oanor.com/bac-api/SOME_PATH");
curl_setopt($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/bac-api/SOME_PATH",
    headers={"x-oanor-key": "oanor_test_..."},
)
print(r.json())

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