How do I know if my substitute yarn is the right amount?

You can use the `get_substitution_requirements` tool. By providing the original yarn specs and the substitute yarn specs, it calculates the exact grams and skeins required.

Can I substitute cotton for wool?

To check this, use `analyze_fiber_compatibility`. It will provide a compatibility score and a warning if the lack of elasticity in cotton might affect your project's drape.

What happens if my gauge is different?

The `get_gauge_impact_summary` tool explains how the gauge difference will change the size of your project and provides a multiplier to adjust your yardage.

Yarn Substitution Calculator MCP Connector for Claude

A+

Calculate exact yarn requirements and fiber compatibility for knitting and crochet substitutions.

3 tools Official Updated Oct 1, 2026 Official Vinkius Partner

More Details Connect to Claude

This MCP server provides precise tools for knitters and crocheters to swap yarns safely. Use get_substitution_requirements to determine the exact grams and skeins needed when changing yarn weight or gauge. Use analyze_fiber_compatibility to check if different materials like wool and cotton will behave similarly in your project. You can also use get_gauge_impact_summary to understand how a change in gauge will physically alter the dimensions of your finished piece.

knittingcrochetyarnsubstitutiongauge

Connect to Claude

Subscribe on Vinkius, then add this connector to Claude.ai or Claude Code.

① Claude.ai (web app)

Go to Settings → Connectors → Add custom connector
Paste the MCP endpoint URL below

https://edge.vinkius.com/vk_preview_EQSZ2BWyspKbPBVTfdptJUOcH0Qz1NlQRodiuGrV/mcp

② Claude Code (terminal)

claude mcp add --transport http yarn-substitution-calculator https://edge.vinkius.com/vk_preview_EQSZ2BWyspKbPBVTfdptJUOcH0Qz1NlQRodiuGrV/mcp

③ Claude Desktop

Add to claude_desktop_config.json:

{
  "mcpServers": {
    "yarn-substitution-calculator": {
      "url": "https://edge.vinkius.com/vk_preview_EQSZ2BWyspKbPBVTfdptJUOcH0Qz1NlQRodiuGrV/mcp"
    }
  }
}

Get full access on Vinkius

The preview token above works for testing. Powered by Vinkius.