{"success":true,"version":"v1","request":{"tool":"get_calculator_schema","calculator_id":"protein-intake"},"result":{"entity_type":"calculator","id":"protein-intake","calculator_id":"protein-intake","canonical_url":"https://tttkmbb.com/health/protein-intake","name":"Protein Intake Calculator","title":"Daily Protein Intake Calculator by Body Weight and Goal","category":"health","category_name":"Health","tool_name":"calculate_protein_intake","featured_mcp_tool":false,"description":"Recommends a daily protein range in grams from body weight and goal (sedentary RDA 0.8 g/kg up to 1.6–2.2 g/kg for muscle gain or fat loss), based on the ISSN position stand.","use_when":"You want a protein target in grams per day for an adult given their activity or goal.","do_not_use_when":"Kidney disease or other medical conditions limit protein; consult a clinician.","inputs":[{"name":"weight_kg","label":"Weight","type":"number","unit":"kg","required":true,"max":700,"exclusive_min":0,"description":"Body weight in kilograms.","example":70},{"name":"goal","label":"Goal / activity","type":"enum","required":false,"default":"active","values":[{"value":"sedentary","label":"Sedentary adult (RDA 0.8 g/kg)"},{"value":"active","label":"Recreationally active (1.2–1.6 g/kg)"},{"value":"endurance","label":"Endurance training (1.2–1.6 g/kg)"},{"value":"muscle_gain","label":"Strength / muscle gain (1.6–2.2 g/kg)","aliases":["strength","bulking"]},{"value":"fat_loss","label":"Fat loss while training (1.8–2.4 g/kg)","aliases":["cutting","weight_loss"]},{"value":"older_adult","label":"Adults over 65 (1.0–1.2 g/kg)","aliases":["senior","elderly"]}],"description":"Determines the g/kg range applied.","example":"active"}],"outputs":[{"name":"protein_min_g","label":"Minimum","type":"number","unit":"g/day","decimals":0,"description":"Lower end of the range."},{"name":"protein_max_g","label":"Maximum","type":"number","unit":"g/day","decimals":0,"description":"Upper end of the range."},{"name":"protein_recommended_g","label":"Recommended","type":"number","unit":"g/day","decimals":0,"description":"Midpoint of the range."},{"name":"g_per_kg_range","label":"Range used","type":"string","decimals":4,"description":"Grams per kilogram applied."}],"input_schema":{"type":"object","properties":{"weight_kg":{"description":"Body weight in kilograms. Unit: kg.","type":"number","maximum":700,"exclusiveMinimum":0,"examples":[70],"x-unit":"kg"},"goal":{"description":"Determines the g/kg range applied.","type":"string","enum":["sedentary","active","endurance","muscle_gain","fat_loss","older_adult"],"default":"active","examples":["active"]}},"additionalProperties":false,"required":["weight_kg"]},"output_schema":{"type":"object","properties":{"protein_min_g":{"description":"Lower end of the range. Unit: g/day.","type":"number","x-unit":"g/day"},"protein_max_g":{"description":"Upper end of the range. Unit: g/day.","type":"number","x-unit":"g/day"},"protein_recommended_g":{"description":"Midpoint of the range. Unit: g/day.","type":"number","x-unit":"g/day"},"g_per_kg_range":{"description":"Grams per kilogram applied.","type":"string"}}},"formula":"protein_g = weight_kg × g_per_kg (range depends on goal)","sources":[{"name":"Jäger R et al. (2017) ISSN Position Stand: protein and exercise, J Int Soc Sports Nutr 14:20","url":"https://jissn.biomedcentral.com/articles/10.1186/s12970-017-0177-8","type":"peer_reviewed","retrieved_at":"2026-09-23"},{"name":"National Academies – Dietary Reference Intakes for protein (RDA 0.8 g/kg)","url":"https://nap.nationalacademies.org/catalog/10490","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":"70 kg sedentary","inputs":{"weight_kg":70,"goal":"sedentary"},"expected":{"protein_min_g":56,"protein_max_g":56,"protein_recommended_g":56,"g_per_kg_range":"0.8–0.8"},"url":"https://tttkmbb.com/api/v1/calculate/protein-intake?weight_kg=70&goal=sedentary"},{"name":"80 kg muscle gain","inputs":{"weight_kg":80,"goal":"muscle_gain"},"expected":{"protein_min_g":128,"protein_max_g":176,"protein_recommended_g":152},"url":"https://tttkmbb.com/api/v1/calculate/protein-intake?weight_kg=80&goal=muscle_gain"}],"faq":[{"q":"Can I eat too much protein?","a":"Healthy adults tolerate intakes up to about 2 g/kg long term; higher intakes are not harmful for healthy kidneys but bring no extra benefit."},{"q":"Should I use total or lean body weight?","a":"For people with obesity, using target or lean body weight avoids unrealistically high targets."}],"tags":["protein intake","how much protein","grams of protein","protein per kg"],"related":[{"calculator_id":"macros","reason":"Fit the protein target into a full macro split."},{"calculator_id":"lean-body-mass","reason":"Use lean mass instead of total weight for very heavy individuals."}],"links":{"html":"https://tttkmbb.com/health/protein-intake","markdown":"https://tttkmbb.com/health/protein-intake.md","json":"https://tttkmbb.com/health/protein-intake.json","api":"https://tttkmbb.com/api/v1/calculate/protein-intake","schema":"https://tttkmbb.com/api/v1/calculators/protein-intake","openapi":"https://tttkmbb.com/openapi.json","mcp":"https://tttkmbb.com/mcp"},"version":"v1","updated_at":"2026-09-23"},"timestamp":"2026-09-23T23:32:26Z"}