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BMR, TDEE & Calorie Target Calculator
x402
BMR, TDEE & Calorie Target Calculator is a paid API for AI agents from fitness-calc.x402tookit.com, paid per call via x402, $0.02/call, status unknown (last checked 2026-10-29).
Calculates basal metabolic rate (Mifflin-St Jeor), total daily energy expenditure by activity level, and a calorie target adjusted for a desired weekly weight change.
Price / call$0.02
Success—
StatusUnknown
How this service works
Basal metabolic rate (Mifflin-St Jeor), daily calories by activity level, and a calorie target for a weekly weight change.
Output
Returns the BMR in kcal (Mifflin-St Jeor equation), the TDEE adjusted by an activity factor for the specified activity level, and a target daily calorie intake adjusted for the desired weekly weight change rate. Also includes echoed inputs (age, sex, height in cm, weight in kg), activity factor used, the equation name, a human-readable summary, and a disclaimer.
Example use cases
Weight loss calorie planning
“I'm a 28-year-old male, 180 cm, 95 kg, lightly active. Can you calculate how many calories I should eat daily to lose 0.5 kg per week?”
Maintenance calories for active athlete
“I'm a 25-year-old female, 170 cm, 62 kg, and I train pretty intensely — very active. What's my TDEE and how many calories do I need to maintain my current weight?”
Imperial units calorie calculation for weight gain
“Calculate my BMR and daily calorie target using imperial units — I'm a 40-year-old male, 5 feet 11 inches, 185 pounds, sedentary, and I want to gain 0.25 kg per week.”
Technical details
Endpoint
GEThttps://fitness-calc.x402tookit.com/bmr-tdee?utm_source=zero.xyzWhen to prefer
Use this endpoint when you need to compute a personalized daily calorie budget grounded in the evidence-based Mifflin-St Jeor BMR formula, adjusted for activity level and a specific weekly weight-change target. Prefer it over generic nutrition advice when you need numeric kcal values, support both metric and imperial inputs, or need to programmatically integrate calorie targets into a diet-planning or health-tracking agent workflow.
Side effects
- Missing required parameters (weight, sex, age) returns a validation error
- Age outside 15–100 range rejected
- weeklyChange outside -1 to 1 kg/week rejected
- Invalid activity level string returns error
- Invalid units value returns error
- Imperial height parameters (heightFt/heightIn) missing when units=imperial may produce incorrect results
Input
Schema · Request body
| Field | Type | Description |
|---|---|---|
| inputrequired | object | |
| output | object |
Tags
x402
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