Macro Calculator

Calculators REST API MCP

Calculate daily calorie needs and a macronutrient split (protein, carbs, fat in grams and kcal) for weight loss, maintenance, or muscle gain. Uses Mifflin-St Jeor BMR, an activity multiplier, a +/-500 kcal goal adjustment, and goal-specific ratios.

This page documents the MCP tool findutils:macro_calculator. See the REST reference →

Use in the browser View as Markdown

Call it over MCP

Tool name findutils:macro_calculator · no API keys · 120 requests/min per IP

Claude Code

claude mcp add findutils --transport http https://mcp.findutils.com/

Claude Desktop — claude_desktop_config.json

{
  "mcpServers": {
    "findutils": {
      "url": "https://mcp.findutils.com/"
    }
  }
}

Raw JSON-RPC (any MCP client) — verified example

curl -X POST https://mcp.findutils.com/ \
  -H "Content-Type: application/json" \
  -d '{
    "jsonrpc": "2.0",
    "id": 1,
    "method": "tools/call",
    "params": {
      "name": "macro_calculator",
      "arguments": {
        "gender": "male",
        "age": 30,
        "weight": 70,
        "height": 175
      }
    }
  }'

Input schema

Argument	Type	Required	Description
gender	string (male \| female)	yes	Biological sex used by the BMR equation.
age	integer	yes	Age in years (1-120).
weight	number	yes	Body weight in kg (metric) or lbs (imperial).
height	number	yes	Height in cm (metric) or inches (imperial).
unit_system	string (metric \| imperial)	no	Unit system for weight and height. Default: "metric".
activity_level	string (sedentary \| light \| moderate \| active \| very_active)	no	Activity level: sedentary 1.2, light 1.375, moderate 1.55, active 1.725, very_active 1.9. Default: "moderate".
goal	string (lose \| maintain \| gain)	no	lose = -500 kcal with 35/35/30 split, maintain = 30/40/30, gain = +500 kcal with 25/50/25 (protein/carbs/fat). Default: "maintain".

Example arguments (verified)

{
  "gender": "male",
  "age": 30,
  "weight": 70,
  "height": 175
}

Also a REST endpoint

The same tool answers plain HTTP at POST /api/tools/macro-calculator/execute — no key, 60 requests/min.

Open the REST reference for Macro Calculator →

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