{"uid":"cap_YXsjVF834xIySIDcUShcT","slug":"magent-estimated-blood-ethanol-concentration-bac-calculator-a8a5304d","name":"magent Estimated Blood Ethanol Concentration (BAC) Calculator","description":"Fasting Watson 1981 theoretical Co from ingested ethanol grams and sex-specific Watson 1980 total body water. Blood-water fraction 0.80; absorbed fraction 1. Fasting Widmark-type estimate only. Ethanol only; not a medicolegal BAC or treatment dose.","url":"https://api.magentlab.com/api/calc/estimated_ethanol","method":"GET","headers":{},"bodySchema":{"type":"object","$schema":"https://json-schema.org/draft/2020-12/schema","required":["input"],"properties":{"input":{"type":"object","required":["type","method"],"properties":{"type":{"type":"string","const":"http"},"method":{"enum":["GET","HEAD","DELETE"],"type":"string"},"headers":{"type":"object","additionalProperties":{"type":"string"}},"queryParams":{"type":"object","required":["sex","age","ethanol_g"],"properties":{"age":{"type":"integer","description":"Age in years (18-120). Used in male TBW; required for both sexes."},"sex":{"enum":["female","male"],"type":"string","description":"Sex for Watson 1980 TBW: male uses age, height, and weight; female uses height and weight only."},"ethanol_g":{"type":"number","description":"Ingested ethanol mass in grams (0-500). Watson 1981 does not publish a mass clamp; one US standard drink is about 14 g."},"height_cm":{"type":"number","description":"Height in centimeters (50-250). Provide height_cm or height_in."},"height_in":{"type":"number","description":"Height in inches (20-98). Converted as cm = in * 2.54."},"weight_kg":{"type":"number","description":"Weight in kilograms (1-500). Provide weight_kg or weight_lb."},"weight_lb":{"type":"number","description":"Weight in pounds (2-1100). Converted as kg = lb * 0.45359237."}}}},"additionalProperties":false},"output":{"type":"object","required":["type"],"properties":{"type":{"type":"string"},"example":{"type":"object"}}}}},"responseSchema":null,"example":null,"exampleRequest":null,"tags":["x402"],"displayCostAmount":"0.005","displayCostAsset":"USDC","priceDynamic":false,"priceHint":null,"priceStatus":"priced","priceSource":"probe","requiresHandshake":false,"reviewCount":0,"rating":{"score":"0.00","successRate":"0.00","reviews":0,"stars":null,"state":"unrated"},"availabilityStatus":"unknown","priceObserved":null,"sessionDeposit":null,"pricing":{"kind":"static","summary":"$0.005/call","primary":{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"},"accepted":[{"kind":"static","protocol":"x402","network":"base","amountUsd":"0.005","per":"call","confidence":"exact"}]},"paymentMethods":[{"uid":"pm_HK088WVfA5yu7i8OaSWKy","protocol":"x402","methodType":"crypto","chain":"base","mode":"charge","costAmount":"0.005","costPer":"request","priority":0,"asset":"0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913","unit":"request","depositMicros":null,"planRef":null}],"brandName":null,"brandSlug":null,"brandBaseUrl":null,"brandDocsUrl":null,"whatItDoes":"Estimates fasting blood alcohol concentration using Watson 1981 TBW and sex-specific body composition parameters from ingested ethanol grams.","exampleAgentPrompt":"Estimate the fasting BAC for a 35-year-old male who is 180 cm tall, weighs 80 kg, and has ingested 42 grams of ethanol — use the Watson total body water method.","exampleUseCases":[{"title":"Research dose modeling for ethanol study","prompt":"I'm designing a pharmacokinetics study. What would the estimated fasting BAC be for a 28-year-old female, 165 cm tall, weighing 62 kg, who consumed 28 grams of ethanol?"},{"title":"Nutrition app alcohol tracker estimate","prompt":"A user in our app is male, age 45, 175 cm, 90 kg, and drank about 56 grams of ethanol tonight. Can you estimate their theoretical blood alcohol concentration using the Watson 1981 model?"},{"title":"Educational BAC illustration for health class","prompt":"For a health education demo, what is the estimated BAC for a 22-year-old male who is 5 feet 11 inches tall, weighs 160 pounds, and consumed 14 grams of ethanol — roughly one standard drink?"}],"resultDescription":"Returns a computed fasting blood ethanol concentration estimate derived from the Watson 1981 formula using sex-specific total body water (Watson 1980), a blood-water fraction of 0.80, and full absorption assumption. Output is a theoretical BAC value suitable for research or educational use only, not for medicolegal or clinical treatment decisions.","failureModes":["Missing required fields (sex, age, ethanol_g) returns a 400 validation error","Neither height_cm/height_in nor weight_kg/weight_lb provided causes computation failure","Out-of-range values (e.g. age <18, ethanol_g >500) may return errors or undefined results","Payment not provided or insufficient USDC results in 402 Payment Required","Incorrect sex enum value (not 'male' or 'female') returns validation error"],"whenToPreferThis":"Use this endpoint when you need a fast, theoretically grounded fasting BAC estimate based on ingested ethanol grams and anthropometric inputs (sex, age, height, weight) using the Watson 1981/1980 methodology. Prefer it for research modeling, educational demonstrations, or app features requiring a pharmacokinetic BAC approximation. Do not use for medicolegal BAC determination, clinical dosing, or post-absorption scenarios.","instructions":null,"reviewSummary":null,"reviewSummaryHighlights":null,"reviewSummaryConcerns":null,"reviewSummaryGeneratedAt":null,"activationCount":0,"lastUsedAt":null,"lastSuccessfullyRanAt":null,"lastHealthCheckAt":"2026-09-14T12:56:08.624Z","isFirstParty":false}