Math & Numbers

Digital Root Calculator

Calculate the digital root of numbers. The digital root is the recursive sum of digits until a single digit is obtained.

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Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'https://api.elysiatools.com/en/api/tools/digital-root-calculator' \
  -H 'Content-Type: application/json' \
  -d '{"numberInput":"Enter numbers to calculate digital roots, one per line:\n12345\n987654321\n42\n0\n-999","method":"iterative","showSteps":false,"showProperties":false,"addLineNumbers":false,"showSourceData":false}'

API reference

Send a POST request with your inputs as JSON. File parameters require a separate upload first.

Endpoint

HTTP

POST https://api.elysiatools.com/en/api/tools/digital-root-calculator

Parameters

Name	Type	Required	Description
numberInput	textarea	Yes	—
method	select	Yes	Choose the method for calculating digital roots
showSteps	checkbox	No	Display the step-by-step calculation process
showProperties	checkbox	No	Display mathematical properties of the digital root
addLineNumbers	checkbox	No

MCP integration

Add this tool to your Model Context Protocol server so AI agents can list and call it.

Server configuration

Add this block to your MCP client configuration:

mcp.json

{
  "mcpServers": {
    "elysiatools-digital-root-calculator": {
      "name": "digital-root-calculator",
      "description": "Calculate the digital root of numbers. The digital root is the recursive sum of digits until a single digit is obtained.",
      "baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=digital-root-calculator",
      "command": "",
      "args": [],
      "env": {},
      "isActive": true,
      "type": "sse"
    }
  }
}

List available tools

After connecting to the SSE endpoint, list the exposed tools:

tools/list

{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/list"
}

Call this tool

Invoke the tool by its id, passing arguments built from its parameters:

tools/call

{
  "jsonrpc": "2.0",
  "id": 2,
  "method": "tools/call",
  "params": {
    "name": "digital-root-calculator",
    "arguments": {
  "numberInput": "Enter numbers to calculate digital roots, one per line:\n12345\n987654321\n42\n0\n-999",
  "method": "iterative",
  "showSteps": false,
  "showProperties": false,
  "addLineNumbers": false,
  "showSourceData": false
}
  }
}

Chain multiple tools in one session with a comma-separated toolId list, e.g. /mcp/sse?toolId=png-to-webp,jpg-to-webp,gif-to-webp (max 20).

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