Math & Numbers
Rebar Area Calculator
Calculate the total cross-sectional area of reinforcing steel: A = n·π·D²/4. Choose a standard metric diameter (6–40 mm) or a custom diameter and the number of bars. Also returns the single-bar area, perimeter, theoretical unit weight (ρ=7850 kg/m³), and total weight.
json· JSON resultOpen tool
Quick start
Call this tool from your code in three languages.
cURL
curl -X POST 'https://api.elysiatools.com/en/api/tools/rebar-area-calculator' \
-H 'Content-Type: application/json' \
-d '{"diameterPreset":"16","customDiameter":0,"count":6,"length":0,"decimalPlaces":2}'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/rebar-area-calculatorParameters
| Name | Type | Required | Description |
|---|---|---|---|
| diameterPreset | select | No | — |
| customDiameter | number | No | Used only when 'Bar Diameter' = Custom. |
| count | number | Yes | — |
| length | number | No | Optional. If provided, the tool also returns the total steel weight. |
| decimalPlaces | 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-rebar-area-calculator": {
"name": "rebar-area-calculator",
"description": "Calculate the total cross-sectional area of reinforcing steel: A = n·π·D²/4. Choose a standard metric diameter (6–40 mm) or a custom diameter and the number of bars. Also returns the single-bar area, perimeter, theoretical unit weight (ρ=7850 kg/m³), and total weight.",
"baseUrl": "https://api.elysiatools.com/mcp/sse?toolId=rebar-area-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": "rebar-area-calculator",
"arguments": {
"diameterPreset": "16",
"customDiameter": 0,
"count": 6,
"length": 0,
"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]