{ "version": "1.3.0", "name": "AI Fit Hub Agent Tool Index", "description": "Machine-readable index for AI Fit Hub — 57 performance calculators across nutrition, strength, cardio, body composition, recovery, and planning. Tools return structured JSON with industry benchmark context. No auth required. Each tool exposes a pure-compute ES module at https://aifithub.io/engines/{slug}.js — import it directly and call compute(input). See manifest at https://aifithub.io/engines/manifest.json.", "site": "https://aifithub.io", "disclaimer": "General fitness estimates — not medical advice.", "discovery": { "human_entrypoint": "https://aifithub.io/for-agents/", "llms": "https://aifithub.io/llms.txt", "ai_plugin": "https://aifithub.io/.well-known/ai-plugin.json", "webmcp": "https://aifithub.io/.well-known/webmcp.json", "homepage": "https://aifithub.io/", "articles": "https://aifithub.io/articles/", "methodology": "https://aifithub.io/methodology/", "editorial_standards": "https://aifithub.io/editorial-standards/", "sponsor_disclosure": "https://aifithub.io/sponsor-disclosure/", "corrections": "https://aifithub.io/corrections/", "search_index": "https://aifithub.io/search-index.json", "llms_full": "https://aifithub.io/llms-full.txt", "engines_manifest": "https://aifithub.io/engines/manifest.json" }, "tools": [ { "tool_id": "tdee_calculator", "name": "TDEE Calculator", "short_name": "TDEE", "category": "Nutrition", "summary": "Estimate your daily energy expenditure with Mifflin-St Jeor + activity factors.", "url": "https://aifithub.io/tdee-calculator/", "path": "/tdee-calculator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/tdee-calculator.json", "engine": { "module": "https://aifithub.io/engines/tdee-calculator.js", "types": "https://aifithub.io/engines/tdee-calculator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/tdee-calculator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "sex": { "type": "string" }, "age": { "type": "number" }, "weight_kg": { "type": "number" }, "height_cm": { "type": "number" }, "activity_level": { "type": "string" } }, "required": [ "tool", "sex", "age", "weight_kg", "height_cm", "activity_level" ] }, "keywords": [ "tdee calculator", "tdee", "nutrition", "free tdee", "online tdee", "fitness tdee" ], "methodology_url": "https://aifithub.io/methodology/tdee-calculator/", "formula_url": "https://aifithub.io/formulas/tdee-formula/", "calculator_guide_url": "https://aifithub.io/calculator-guides/tdee-calculator/" }, { "tool_id": "bmr_calculator", "name": "BMR Calculator", "short_name": "BMR", "category": "Nutrition", "summary": "Estimate basal metabolic rate and maintenance calories using Mifflin-St Jeor assumptions.", "url": "https://aifithub.io/bmr-calculator/", "path": "/bmr-calculator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/bmr-calculator.json", "engine": { "module": "https://aifithub.io/engines/bmr-calculator.js", "types": "https://aifithub.io/engines/bmr-calculator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/bmr-calculator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "sex": { "type": "string" }, "age": { "type": "integer" }, "weight_kg": { "type": "integer" }, "height_cm": { "type": "integer" }, "activity_level": { "type": "string" } }, "required": [ "tool", "sex", "age", "weight_kg", "height_cm", "activity_level" ] }, "keywords": [ "bmr calculator", "nutrition", "free bmr", "online bmr", "fitness bmr" ], "methodology_url": "https://aifithub.io/methodology/bmr-calculator/", "formula_url": "https://aifithub.io/formulas/bmr-formula/", "calculator_guide_url": "https://aifithub.io/calculator-guides/bmr-calculator/" }, { "tool_id": "macro_calculator", "name": "Macro Calculator", "short_name": "Macros", "category": "Nutrition", "summary": "Convert calorie targets into protein, carbs, and fat grams for your goal.", "url": "https://aifithub.io/macro-calculator/", "path": "/macro-calculator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/macro-calculator.json", "engine": { "module": "https://aifithub.io/engines/macro-calculator.js", "types": "https://aifithub.io/engines/macro-calculator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/macro-calculator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "calories": { "type": "number" }, "weight_kg": { "type": "number" } }, "required": [ "tool", "calories", "weight_kg" ] }, "keywords": [ "macro calculator", "macro", "nutrition", "free macro", "online macro", "fitness macro" ], "methodology_url": "https://aifithub.io/methodology/macro-calculator/", "calculator_guide_url": "https://aifithub.io/calculator-guides/macro-calculator/" }, { "tool_id": "bmi_calculator", "name": "BMI Calculator", "short_name": "BMI", "category": "Body Composition", "summary": "Calculate BMI quickly with a plain-language range explanation and limitations.", "url": "https://aifithub.io/bmi-calculator/", "path": "/bmi-calculator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/bmi-calculator.json", "engine": { "module": "https://aifithub.io/engines/bmi-calculator.js", "types": "https://aifithub.io/engines/bmi-calculator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/bmi-calculator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "weight_kg": { "type": "number" }, "height_cm": { "type": "number" } }, "required": [ "tool", "weight_kg", "height_cm" ] }, "keywords": [ "bmi calculator", "body composition", "free bmi", "online bmi", "fitness bmi" ], "methodology_url": "https://aifithub.io/methodology/bmi-calculator/", "formula_url": "https://aifithub.io/formulas/bmi-formula/", "calculator_guide_url": "https://aifithub.io/calculator-guides/bmi-calculator/" }, { "tool_id": "calorie_deficit_calculator", "name": "Calorie Deficit Calculator", "short_name": "Calorie Deficit", "category": "Planning", "summary": "Estimate required daily calorie deficit for a target timeline and bodyweight change.", "url": "https://aifithub.io/calorie-deficit-calculator/", "path": "/calorie-deficit-calculator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/calorie-deficit-calculator.json", "engine": { "module": "https://aifithub.io/engines/calorie-deficit-calculator.js", "types": "https://aifithub.io/engines/calorie-deficit-calculator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/calorie-deficit-calculator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "tdee": { "type": "number" }, "current_weight_kg": { "type": "number" }, "target_weight_kg": { "type": "number" }, "weeks": { "type": "number" } }, "required": [ "tool", "tdee", "current_weight_kg", "target_weight_kg", "weeks" ] }, "keywords": [ "calorie deficit calculator", "calorie deficit", "planning", "free calorie deficit", "online calorie deficit", "fitness calorie deficit" ], "methodology_url": "https://aifithub.io/methodology/calorie-deficit-calculator/", "formula_url": "https://aifithub.io/formulas/calorie-deficit-formula/", "calculator_guide_url": "https://aifithub.io/calculator-guides/calorie-deficit-calculator/" }, { "tool_id": "body_recomposition_planner", "name": "Body Recomposition Planner", "short_name": "Body Recomp", "category": "Planning", "summary": "Plan body-fat reduction pace, deficit targets, and protein needs around a timeline.", "url": "https://aifithub.io/body-recomposition-planner/", "path": "/body-recomposition-planner/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/body-recomposition-planner.json", "engine": { "module": "https://aifithub.io/engines/body-recomposition-planner.js", "types": "https://aifithub.io/engines/body-recomposition-planner.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/body-recomposition-planner.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "weight_kg": { "type": "integer" }, "body_fat_percent": { "type": "integer" }, "target_body_fat_percent": { "type": "integer" }, "weeks": { "type": "integer" }, "resistance_training_days": { "type": "integer" } }, "required": [ "tool", "weight_kg", "body_fat_percent", "target_body_fat_percent", "weeks", "resistance_training_days" ] }, "keywords": [ "body recomposition planner calculator", "body recomposition planner", "planning", "free body recomposition planner", "online body recomposition planner", "fitness body recomposition planner" ], "methodology_url": "https://aifithub.io/methodology/body-recomposition-planner/", "formula_url": "https://aifithub.io/formulas/body-recomposition-formula/", "calculator_guide_url": "https://aifithub.io/calculator-guides/body-recomposition-planner/" }, { "tool_id": "progressive_overload_planner", "name": "Progressive Overload Planner", "short_name": "Progressive Overload", "category": "Strength", "summary": "Project lifting progression with weekly overload and planned deload cycles.", "url": "https://aifithub.io/progressive-overload-planner/", "path": "/progressive-overload-planner/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/progressive-overload-planner.json", "engine": { "module": "https://aifithub.io/engines/progressive-overload-planner.js", "types": "https://aifithub.io/engines/progressive-overload-planner.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/progressive-overload-planner.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "current_lift_kg": { "type": "integer" }, "weekly_increase_percent": { "type": "number" }, "training_weeks": { "type": "integer" }, "deload_every_weeks": { "type": "integer" }, "deload_drop_percent": { "type": "integer" } }, "required": [ "tool", "current_lift_kg", "weekly_increase_percent", "training_weeks", "deload_every_weeks", "deload_drop_percent" ] }, "keywords": [ "progressive overload planner calculator", "progressive overload planner", "strength", "free progressive overload planner", "online progressive overload planner", "fitness progressive overload planner" ], "methodology_url": "https://aifithub.io/methodology/progressive-overload-planner/", "formula_url": "https://aifithub.io/formulas/progressive-overload-formula/", "calculator_guide_url": "https://aifithub.io/calculator-guides/progressive-overload-planner/" }, { "tool_id": "one_rep_max_calculator", "name": "One-Rep Max Calculator", "short_name": "1RM", "category": "Strength", "summary": "Estimate one-rep max with Epley, Brzycki, and Lombardi formulas.", "url": "https://aifithub.io/one-rep-max-calculator/", "path": "/one-rep-max-calculator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/one-rep-max-calculator.json", "engine": { "module": "https://aifithub.io/engines/one-rep-max-calculator.js", "types": "https://aifithub.io/engines/one-rep-max-calculator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/one-rep-max-calculator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "weight_kg": { "type": "number" }, "reps": { "type": "number" } }, "required": [ "tool", "weight_kg", "reps" ] }, "keywords": [ "rep max calculator", "rep max", "onerep max calculator", "strength", "free rep max", "online rep max", "fitness rep max" ], "methodology_url": "https://aifithub.io/methodology/one-rep-max-calculator/", "formula_url": "https://aifithub.io/formulas/one-rep-max-formula/", "calculator_guide_url": "https://aifithub.io/calculator-guides/one-rep-max-calculator/" }, { "tool_id": "body_fat_percentage_calculator", "name": "Body Fat Percentage Calculator", "short_name": "Body Fat %", "category": "Body Composition", "summary": "Estimate body fat percentage using the U.S. Navy circumference method.", "url": "https://aifithub.io/body-fat-percentage-calculator/", "path": "/body-fat-percentage-calculator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/body-fat-percentage-calculator.json", "engine": { "module": "https://aifithub.io/engines/body-fat-percentage-calculator.js", "types": "https://aifithub.io/engines/body-fat-percentage-calculator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/body-fat-percentage-calculator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "sex": { "type": "string" }, "waist_cm": { "type": "number" }, "neck_cm": { "type": "number" }, "height_cm": { "type": "number" } }, "required": [ "tool", "sex", "waist_cm", "neck_cm", "height_cm" ] }, "keywords": [ "body fat percentage calculator", "body fat percentage", "body composition", "free body fat percentage", "online body fat percentage", "fitness body fat percentage" ], "methodology_url": "https://aifithub.io/methodology/body-fat-percentage-calculator/", "calculator_guide_url": "https://aifithub.io/calculator-guides/body-fat-percentage-calculator/" }, { "tool_id": "protein_intake_calculator", "name": "Protein Intake Calculator", "short_name": "Protein Intake", "category": "Nutrition", "summary": "Get daily protein targets based on training level and goal.", "url": "https://aifithub.io/protein-intake-calculator/", "path": "/protein-intake-calculator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/protein-intake-calculator.json", "engine": { "module": "https://aifithub.io/engines/protein-intake-calculator.js", "types": "https://aifithub.io/engines/protein-intake-calculator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/protein-intake-calculator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "weight_kg": { "type": "number" }, "activity_level": { "type": "string" }, "goal": { "type": "string" } }, "required": [ "tool", "weight_kg", "activity_level", "goal" ] }, "keywords": [ "protein intake calculator", "protein intake", "nutrition", "free protein intake", "online protein intake", "fitness protein intake" ], "methodology_url": "https://aifithub.io/methodology/protein-intake-calculator/", "formula_url": "https://aifithub.io/formulas/protein-intake-formula/", "calculator_guide_url": "https://aifithub.io/calculator-guides/protein-intake-calculator/" }, { "tool_id": "ideal_weight_calculator", "name": "Ideal Weight Calculator", "short_name": "Ideal Weight", "category": "Body Composition", "summary": "Compare Devine, Robinson, Miller, and Hamwi formulas as a realistic range.", "url": "https://aifithub.io/ideal-weight-calculator/", "path": "/ideal-weight-calculator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/ideal-weight-calculator.json", "engine": { "module": "https://aifithub.io/engines/ideal-weight-calculator.js", "types": "https://aifithub.io/engines/ideal-weight-calculator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/ideal-weight-calculator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "sex": { "type": "string" }, "height_cm": { "type": "number" } }, "required": [ "tool", "sex", "height_cm" ] }, "keywords": [ "ideal weight calculator", "ideal weight", "body composition", "free ideal weight", "online ideal weight", "fitness ideal weight" ], "methodology_url": "https://aifithub.io/methodology/ideal-weight-calculator/", "formula_url": "https://aifithub.io/formulas/ideal-weight-formula/", "calculator_guide_url": "https://aifithub.io/calculator-guides/ideal-weight-calculator/" }, { "tool_id": "running_pace_calculator", "name": "Running Pace Calculator", "short_name": "Running Pace", "category": "Cardio", "summary": "Calculate pace per km and mile and project race finish times from one run.", "url": "https://aifithub.io/running-pace-calculator/", "path": "/running-pace-calculator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/running-pace-calculator.json", "engine": { "module": "https://aifithub.io/engines/running-pace-calculator.js", "types": "https://aifithub.io/engines/running-pace-calculator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/running-pace-calculator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "distance_km": { "type": "number" }, "time_minutes": { "type": "number" } }, "required": [ "tool", "distance_km", "time_minutes" ] }, "keywords": [ "running pace calculator", "running pace", "cardio", "free running pace", "online running pace", "fitness running pace" ], "methodology_url": "https://aifithub.io/methodology/running-pace-calculator/", "formula_url": "https://aifithub.io/formulas/running-pace-formula/", "calculator_guide_url": "https://aifithub.io/calculator-guides/running-pace-calculator/" }, { "tool_id": "heart_rate_zone_calculator", "name": "Heart Rate Zone Calculator", "short_name": "Heart Rate Zones", "category": "Recovery", "summary": "Calculate personalized training zones with the Karvonen method.", "url": "https://aifithub.io/heart-rate-zone-calculator/", "path": "/heart-rate-zone-calculator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/heart-rate-zone-calculator.json", "engine": { "module": "https://aifithub.io/engines/heart-rate-zone-calculator.js", "types": "https://aifithub.io/engines/heart-rate-zone-calculator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/heart-rate-zone-calculator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "age": { "type": "number" }, "resting_hr": { "type": "number" } }, "required": [ "tool", "age", "resting_hr" ] }, "keywords": [ "heart rate zone calculator", "heart rate zone", "recovery", "free heart rate zone", "online heart rate zone", "fitness heart rate zone" ], "methodology_url": "https://aifithub.io/methodology/heart-rate-zone-calculator/", "formula_url": "https://aifithub.io/formulas/heart-rate-zone-formula/", "calculator_guide_url": "https://aifithub.io/calculator-guides/heart-rate-zone-calculator/" }, { "tool_id": "water_intake_calculator", "name": "Water Intake Calculator", "short_name": "Water Intake", "category": "Nutrition", "summary": "Calculate daily water intake based on weight, activity level, and climate.", "url": "https://aifithub.io/water-intake-calculator/", "path": "/water-intake-calculator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/water-intake-calculator.json", "engine": { "module": "https://aifithub.io/engines/water-intake-calculator.js", "types": "https://aifithub.io/engines/water-intake-calculator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/water-intake-calculator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "weight_kg": { "type": "number" }, "activity_level": { "type": "string" }, "climate": { "type": "string" } }, "required": [ "tool", "weight_kg", "activity_level", "climate" ] }, "keywords": [ "water intake calculator", "water intake", "nutrition", "free water intake", "online water intake", "fitness water intake" ], "methodology_url": "https://aifithub.io/methodology/water-intake-calculator/", "formula_url": "https://aifithub.io/formulas/water-intake-formula/", "calculator_guide_url": "https://aifithub.io/calculator-guides/water-intake-calculator/" }, { "tool_id": "waist_to_hip_ratio_calculator", "name": "Waist-to-Hip Ratio Calculator", "short_name": "Waist-to-Hip Ratio", "category": "Body Composition", "summary": "Calculate waist-to-hip ratio and assess body composition using WHO guidelines.", "url": "https://aifithub.io/waist-to-hip-ratio-calculator/", "path": "/waist-to-hip-ratio-calculator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/waist-to-hip-ratio-calculator.json", "engine": { "module": "https://aifithub.io/engines/waist-to-hip-ratio-calculator.js", "types": "https://aifithub.io/engines/waist-to-hip-ratio-calculator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/waist-to-hip-ratio-calculator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "waist_cm": { "type": "number" }, "hip_cm": { "type": "number" }, "sex": { "type": "string" } }, "required": [ "tool", "waist_cm", "hip_cm", "sex" ] }, "keywords": [ "waist hip ratio calculator", "waist hip ratio", "waisttohip ratio calculator", "body composition", "free waist hip ratio", "online waist hip ratio", "fitness waist hip ratio" ], "methodology_url": "https://aifithub.io/methodology/waist-to-hip-ratio-calculator/", "formula_url": "https://aifithub.io/formulas/waist-to-hip-ratio-formula/", "calculator_guide_url": "https://aifithub.io/calculator-guides/waist-to-hip-ratio-calculator/" }, { "tool_id": "sleep_calculator", "name": "Sleep Calculator", "short_name": "Sleep", "category": "Recovery", "summary": "Calculate optimal bed and wake times based on 90-minute sleep cycles.", "url": "https://aifithub.io/sleep-calculator/", "path": "/sleep-calculator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/sleep-calculator.json", "engine": { "module": "https://aifithub.io/engines/sleep-calculator.js", "types": "https://aifithub.io/engines/sleep-calculator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/sleep-calculator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "wake_time": { "type": "string" }, "fall_asleep_minutes": { "type": "number" } }, "required": [ "tool", "wake_time", "fall_asleep_minutes" ] }, "keywords": [ "sleep calculator", "sleep", "recovery", "free sleep", "online sleep", "fitness sleep" ], "methodology_url": "https://aifithub.io/methodology/sleep-calculator/", "formula_url": "https://aifithub.io/formulas/sleep-calculator-formula/", "calculator_guide_url": "https://aifithub.io/calculator-guides/sleep-calculator/" }, { "tool_id": "ffmi_calculator", "name": "FFMI Calculator", "short_name": "FFMI", "category": "Body Composition", "summary": "Calculate Fat-Free Mass Index to gauge muscularity and compare against natural benchmarks.", "url": "https://aifithub.io/ffmi-calculator/", "path": "/ffmi-calculator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/ffmi-calculator.json", "engine": { "module": "https://aifithub.io/engines/ffmi-calculator.js", "types": "https://aifithub.io/engines/ffmi-calculator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/ffmi-calculator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "weight_kg": { "type": "number" }, "height_cm": { "type": "number" }, "body_fat_pct": { "type": "number" } }, "required": [ "tool", "weight_kg", "height_cm", "body_fat_pct" ] }, "keywords": [ "ffmi calculator", "ffmi", "body composition", "free ffmi", "online ffmi", "fitness ffmi" ], "methodology_url": "https://aifithub.io/methodology/ffmi-calculator/", "formula_url": "https://aifithub.io/formulas/ffmi-formula/", "calculator_guide_url": "https://aifithub.io/calculator-guides/ffmi-calculator/" }, { "tool_id": "vo2_max_estimator", "name": "VO2 Max Estimator", "short_name": "VO₂ Max", "category": "Cardio", "summary": "Estimate aerobic capacity with the Cooper 12-minute run or Rockport 1-mile walk field tests.", "url": "https://aifithub.io/vo2-max-estimator/", "path": "/vo2-max-estimator/", "mode": "engine_module", "contract": "https://aifithub.io/contracts/vo2-max-estimator.json", "engine": { "module": "https://aifithub.io/engines/vo2-max-estimator.js", "types": "https://aifithub.io/engines/vo2-max-estimator.d.ts", "exports": [ "compute" ], "schema_url": "https://aifithub.io/contracts/vo2-max-estimator.json" }, "input_schema": { "type": "object", "properties": { "tool": { "type": "string" }, "method": { "type": "string" }, "distance_meters": { "type": "number" }, "weight_kg": { "type": 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