{"success":true,"version":"v1","request":{"tool":"get_calculator_schema","calculator_id":"tdee"},"result":{"entity_type":"calculator","id":"tdee","calculator_id":"tdee","canonical_url":"https://tttkmbb.com/health/tdee","name":"TDEE Calculator","title":"TDEE Calculator – Total Daily Energy Expenditure and Calorie Targets","category":"health","category_name":"Health","tool_name":"calculate_tdee","featured_mcp_tool":true,"description":"Estimates total daily energy expenditure from Mifflin-St Jeor BMR and an activity level, and derives calorie targets for maintaining, losing or gaining weight.","use_when":"You need daily maintenance calories for an adult, or calorie targets for a mild/standard deficit or surplus.","do_not_use_when":"The person is a child, pregnant or breastfeeding, or you only need the resting rate (use bmr).","inputs":[{"name":"sex","label":"Biological sex","type":"enum","required":true,"values":[{"value":"male","label":"Male","aliases":["m","man"]},{"value":"female","label":"Female","aliases":["f","woman"]}],"description":"Biological sex used to select the formula coefficients.","example":"male"},{"name":"weight_kg","label":"Weight","type":"number","unit":"kg","required":true,"max":700,"exclusive_min":0,"description":"Body weight in kilograms.","example":70},{"name":"height_cm","label":"Height","type":"number","unit":"cm","required":true,"min":50,"max":300,"description":"Height in centimetres.","example":175},{"name":"age_years","label":"Age","type":"number","unit":"years","required":true,"min":18,"max":120,"description":"Age in years.","example":30},{"name":"activity_level","label":"Activity level","type":"enum","required":false,"default":"moderate","values":[{"value":"sedentary","label":"Sedentary (little or no exercise) ×1.2"},{"value":"light","label":"Light (1–3 days/week) ×1.375"},{"value":"moderate","label":"Moderate (3–5 days/week) ×1.55"},{"value":"very_active","label":"Very active (6–7 days/week) ×1.725","aliases":["very","active"]},{"value":"extra_active","label":"Extra active (physical job + training) ×1.9","aliases":["extra","athlete"]}],"description":"Weekly exercise level; maps to the standard activity multipliers 1.2 / 1.375 / 1.55 / 1.725 / 1.9.","example":"moderate"}],"outputs":[{"name":"bmr_kcal_per_day","label":"BMR","type":"number","unit":"kcal/day","decimals":0,"description":"Mifflin-St Jeor basal metabolic rate."},{"name":"activity_multiplier","label":"Activity multiplier","type":"number","decimals":3,"description":"Factor applied to BMR."},{"name":"tdee_kcal_per_day","label":"TDEE (maintenance)","type":"number","unit":"kcal/day","decimals":0,"description":"Calories to maintain current weight."},{"name":"mild_loss_kcal_per_day","label":"Mild weight loss (−250)","type":"number","unit":"kcal/day","decimals":0,"description":"Approximately 0.25 kg/week loss."},{"name":"loss_kcal_per_day","label":"Weight loss (−500)","type":"number","unit":"kcal/day","decimals":0,"description":"Approximately 0.5 kg/week loss."},{"name":"mild_gain_kcal_per_day","label":"Mild weight gain (+250)","type":"number","unit":"kcal/day","decimals":0,"description":"Approximately 0.25 kg/week gain."},{"name":"gain_kcal_per_day","label":"Weight gain (+500)","type":"number","unit":"kcal/day","decimals":0,"description":"Approximately 0.5 kg/week gain."}],"input_schema":{"type":"object","properties":{"sex":{"description":"Biological sex used to select the formula coefficients.","type":"string","enum":["male","female"],"examples":["male"]},"weight_kg":{"description":"Body weight in kilograms. 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Unit: kcal/day.","type":"number","x-unit":"kcal/day"},"activity_multiplier":{"description":"Factor applied to BMR.","type":"number"},"tdee_kcal_per_day":{"description":"Calories to maintain current weight. Unit: kcal/day.","type":"number","x-unit":"kcal/day"},"mild_loss_kcal_per_day":{"description":"Approximately 0.25 kg/week loss. Unit: kcal/day.","type":"number","x-unit":"kcal/day"},"loss_kcal_per_day":{"description":"Approximately 0.5 kg/week loss. Unit: kcal/day.","type":"number","x-unit":"kcal/day"},"mild_gain_kcal_per_day":{"description":"Approximately 0.25 kg/week gain. Unit: kcal/day.","type":"number","x-unit":"kcal/day"},"gain_kcal_per_day":{"description":"Approximately 0.5 kg/week gain. Unit: kcal/day.","type":"number","x-unit":"kcal/day"}}},"formula":"TDEE = BMR(Mifflin-St Jeor) × activity_multiplier; targets = TDEE ± 250 or ± 500 kcal/day","sources":[{"name":"Mifflin MD et al. (1990) A new predictive equation for resting energy expenditure, Am J Clin Nutr 51:241-247","url":"https://pubmed.ncbi.nlm.nih.gov/2305711/","type":"peer_reviewed","retrieved_at":"2026-09-23"},{"name":"FAO/WHO/UNU (2004) Human energy requirements – physical activity levels","url":"https://www.fao.org/4/y5686e/y5686e00.htm","type":"standard","retrieved_at":"2026-09-23"}],"freshness":{"type":"static","max_age_seconds":null,"note":"Deterministic formula with fixed constants; results never go stale. Inputs supplied by the caller determine the output."},"examples":[{"name":"Male, 70 kg, 175 cm, 30 y, moderate","inputs":{"sex":"male","weight_kg":70,"height_cm":175,"age_years":30,"activity_level":"moderate"},"expected":{"bmr_kcal_per_day":1649,"activity_multiplier":1.55,"tdee_kcal_per_day":2556,"loss_kcal_per_day":2056,"gain_kcal_per_day":3056},"url":"https://tttkmbb.com/api/v1/calculate/tdee?sex=male&weight_kg=70&height_cm=175&age_years=30&activity_level=moderate"}],"faq":[{"q":"How accurate is TDEE?","a":"Typically within ±10–15%. Activity multipliers are coarse; track weight for 2–3 weeks and adjust intake by 100–200 kcal if weight moves unexpectedly."},{"q":"Which activity level should I choose?","a":"Count only deliberate exercise. Most office workers who train 3 times a week are 'light' or 'moderate', not 'very active'."}],"tags":["tdee","maintenance calories","calorie needs","energy expenditure","cutting","bulking"],"related":[{"calculator_id":"macros","reason":"Turn the chosen calorie target into macronutrient grams."},{"calculator_id":"calorie-deficit","reason":"Estimate how long a deficit takes to reach a target weight."}],"links":{"html":"https://tttkmbb.com/health/tdee","markdown":"https://tttkmbb.com/health/tdee.md","json":"https://tttkmbb.com/health/tdee.json","api":"https://tttkmbb.com/api/v1/calculate/tdee","schema":"https://tttkmbb.com/api/v1/calculators/tdee","openapi":"https://tttkmbb.com/openapi.json","mcp":"https://tttkmbb.com/mcp"},"version":"v1","updated_at":"2026-09-23"},"timestamp":"2026-09-23T23:30:47Z","next_actions":[{"tool":"calculate_tdee","calculator_id":"tdee","reason":"Run TDEE Calculator with the inputs above."}],"links":{"markdown":"https://tttkmbb.com/health/tdee.md"}}