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-calculatorParameters
| 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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