Macronutrient split calculator API

Split total daily calories into carb/protein/fat grams using AMDR-based presets (balanced, lowCarb, keto, highProtein, endurance) or a custom percentage split, at 4/4/9 kcal per gram. Answers 'how many grams of protein in 2000 kcal', 'keto macros for 2000 calories', 'macro split calculator', 'carbs/protein/fat breakdown'.

Price$0.01per request

MethodPOST

Route/v1/health/macro-split

StatusLive

MIME typeapplication/json

Rate limit120/minute

CacheNo cache

healthmacrosmacronutrientsamdrdietketonutritioncalculator

API URLhttps://x402.hexl.dev/v1/health/macro-split

Integration docs

Example request

{
  "calories": 2000,
  "preset": "balanced"
}

Example response

{
  "calories": 2000,
  "split": {
    "carbPct": 50,
    "proteinPct": 25,
    "fatPct": 25
  },
  "grams": {
    "carbsG": 250,
    "proteinG": 125,
    "fatG": 55.6
  },
  "kcal": {
    "carbs": 1000,
    "protein": 500,
    "fat": 500
  },
  "formula": "grams = calories*pct / kcalPerGram (carbs/protein=4, fat=9)",
  "preset": "balanced"
}

Input schema

{
  "type": "object",
  "required": [
    "calories"
  ],
  "properties": {
    "calories": {
      "type": "number",
      "examples": [
        2000
      ]
    },
    "preset": {
      "type": "string",
      "enum": [
        "balanced",
        "lowCarb",
        "keto",
        "highProtein",
        "endurance"
      ],
      "default": "balanced"
    },
    "carbPct": {
      "type": "number",
      "description": "Custom split (must sum to 100 with proteinPct/fatPct)"
    },
    "proteinPct": {
      "type": "number"
    },
    "fatPct": {
      "type": "number"
    }
  }
}

Output schema

{
  "type": "object",
  "additionalProperties": true
}