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Osmolarity Converter (mOsm/L↔mOsm/kg↔mmol/L↔mmol/kg)

Convert mOsm/L ↔ mOsm/kg ↔ mmol/L ↔ mmol/kg using the dissociation factor n and solution density; includes the serum reference range 275–295 mOsm/kg. Not medical advice.

json· JSON resultOpen tool

Quick start

Call this tool from your code in three languages.

cURL

curl -X POST 'http://127.0.0.1:3003/en/api/tools/osmolarity-converter' \
  -H 'Content-Type: application/json' \
  -d '{"value":154,"fromUnit":"mmolPerL","toUnit":"mosmPerL","particles":2,"density":1,"decimalPlaces":2}'

API reference

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

Endpoint

HTTP

POST http://127.0.0.1:3003/en/api/tools/osmolarity-converter

Parameters

Name	Type	Required	Description
value	number	Yes	Concentration value in the From unit. Must be non-negative.
fromUnit	select	Yes	Unit of the entered value.
toUnit	select	Yes	Unit to convert the value into.
particles	number	Yes	Osmotically active particles per formula unit: glucose 1, NaCl ≈ 2, CaCl₂ ≈ 3. Only used when a mmol unit is involved.
density	number	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-osmolarity-converter": {
      "name": "osmolarity-converter",
      "description": "Convert mOsm/L ↔ mOsm/kg ↔ mmol/L ↔ mmol/kg using the dissociation factor n and solution density; includes the serum reference range 275–295 mOsm/kg. Not medical advice.",
      "baseUrl": "http://127.0.0.1:3003/mcp/sse?toolId=osmolarity-converter",
      "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": "osmolarity-converter",
    "arguments": {
  "value": 154,
  "fromUnit": "mmolPerL",
  "toUnit": "mosmPerL",
  "particles": 2,
  "density": 1,
  "decimalPlaces": 2
}
  }
}

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).

Questions or issues? Contact [email protected]

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