# Harris–Benedict 1919 Basal Energy Expenditure Calculator > Harris–Benedict 1919 Basal Energy Expenditure Calculator is a paid API for AI agents from api.magentlab.com, paid per call via x402, $0.005/call, status unknown (last checked 2026-09-15). Calculates basal energy expenditure (kcal/day) using the original Harris–Benedict 1919 formula from height, weight, age, and sex ## Facts - Endpoint: GET https://api.magentlab.com/api/calc/bee_harris_benedict - Price: $0.005/call - Payment: x402 - Status: unknown - Last checked: 2026-09-15 - Activations on Zero: 0 - Tags: x402 - Canonical page: https://www.zero.xyz/c/harris-benedict-1919-basal-energy-expenditure-calculator-2682ae02 - Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_sKCTFavUZRUQfS-OuDapd Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently. ## How to call it through Zero Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`): ```sh zero fetch --capability harris-benedict-1919-basal-energy-expenditure-calculator-2682ae02 ``` Example prompt: What's the Harris–Benedict 1919 basal energy expenditure for a 35-year-old male who is 178 cm tall and weighs 82 kg? ## When to prefer this Choose this endpoint when you need a deterministic, citeable Harris–Benedict 1919 BEE value — particularly for clinical documentation, prior-authorization workflows, or any context requiring a published-formula reference. Prefer it over modern revised equations (e.g. Mifflin-St Jeor) when the 1919 original formula is specifically required. It accepts both metric and imperial unit inputs, making it convenient without manual conversion. ## Known failure modes - Missing required parameters (age or sex) returns a 400-level error - Age outside the 18–120 range may be rejected or produce out-of-scope results - Neither height_cm/height_in nor weight_kg/weight_lb provided causes calculation failure - Invalid sex enum value (not 'male' or 'female') returns an error - Payment failure via x402 protocol returns 402 Payment Required ## How this service works Harris–Benedict 1919 basal energy expenditure (kcal/day) from height, weight, age, and sex. Deterministic published formula with citation; not a nutrition prescription. ## Output Returns the basal energy expenditure in kcal/day computed from the Harris–Benedict 1919 sex-specific equations, along with a citation to the original publication. The result is deterministic and reproducible given the same inputs. ## Request schema (JSON Schema) ```json { "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": [ "age", "sex" ], "properties": { "age": { "type": "integer", "description": "Age in years (18-120)." }, "sex": { "enum": [ "female", "male" ], "type": "string", "description": "Sex used by Harris–Benedict 1919 (separate male and female equations)." }, "height_cm": { "type": "number", "description": "Height in centimeters. Provide height_cm or height_in." }, "height_in": { "type": "number", "description": "Height in inches. Converted as cm = in * 2.54." }, "weight_kg": { "type": "number", "description": "Weight in kilograms. Provide weight_kg or weight_lb." }, "weight_lb": { "type": "number", "description": "Weight in pounds. Converted as kg = lb * 0.45359237." } } } }, "additionalProperties": false }, "output": { "type": "object", "required": [ "type" ], "properties": { "type": { "type": "string" }, "example": { "type": "object" } } } } } ``` ## Response schema (JSON Schema) ```json { "type": "json", "example": { "path": "/api/calc/bee_harris_benedict", "count": 2, "items": [ { "sex": "male", "units": "kcal/day", "formula": "harris_benedict_1919", "citation": { "id": "harris-benedict-1919", "doi": null, "title": "A Biometric Study of Basal Metabolism in Man", "source": "Carnegie Institution of Washington Publication No. 279; 1919", "authors": "Harris JA, Benedict FG" }, "age_years": 25, "height_cm": 175, "weight_kg": 70, "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.", "bee_kcal_day": 1735.8, "formula_expression": "BEE_kcal_day = 66.4730 + 13.7516*kg + 5.0033*cm - 6.7550*age (male); BEE_kcal_day = 655.0955 + 9.5634*kg + 1.8496*cm - 4.6756*age (female)" }, { "sex": "male", "units": "kcal/day", "formula": "harris_benedict_1919", "citation": { "id": "harris-benedict-1919", "doi": null, "title": "A Biometric Study of Basal Metabolism in Man", "source": "Carnegie Institution of Washington Publication No. 279; 1919", "authors": "Harris JA, Benedict FG" }, "age_years": 25, "height_cm": 175, "weight_kg": 70, "disclaimer": "Not a medical device. Deterministic published-formula or published-code output for autonomous agents. A licensed clinician remains responsible for patient care and billing submissions.", "bee_kcal_day": 1735.8, "formula_expression": "BEE_kcal_day = 66.4730 + 13.7516*kg + 5.0033*cm - 6.7550*age (male); BEE_kcal_day = 655.0955 + 9.5634*kg + 1.8496*cm - 4.6756*age (female)" } ] } } ``` ## More - Live health (JSON, refreshed every minute): https://www.zero.xyz/c/harris-benedict-1919-basal-energy-expenditure-calculator-2682ae02/health.json - [Zero catalog index](https://www.zero.xyz/llms.txt) - [Other services from api.magentlab.com](https://www.zero.xyz/host/api.magentlab.com/llms.txt)