For the complete documentation index, see llms.txt.

Steel Weight Calculator API

construction 1 credit / call v2026-04-22

Weight of steel and other metal bars, plates, pipes, tubes, and angles from shape dimensions, density, and quantity.

One POST adds Steel Weight Calculator to your app, site, workflow, or agent — formula, validation, edge cases, and docs already handled.

prefer a UI? Open the Steel Weight Calculator on miniwebtool.com →

Start free — get a key → 1,000 credits · no card · 30 seconds

Endpoint

POST · 1cr
POST https://api.miniwebtool.com/v1/tools/steel-weight-calculator/run

Request body

Field Type Req.
shape
round_bar | square_bar | hex_bar | flat_bar | plate | round_pipe | square_tube | rect_tube | angle
str
material
mild_steel | stainless_304 | stainless_316 | alloy_steel | tool_steel | galvanized_steel | cast_iron | aluminum | brass | copper | custom
str
custom_density
Density in kg/m^3 (material=custom)
float | None
dim_a
Primary dimension in mm: diameter, side, across-flats, or width
float
dim_b
Second dimension in mm (rect_tube, angle)
float | None
thickness
Thickness or wall in mm (flat_bar, plate, pipes, tubes, angle)
float | None
length_m
Length per piece in meters
float
quantity int
price_per_kg float | None

Cost & access

  • 1 credit per successful call — failed calls refund.
  • Starts on: Free.
  • Max payload: 65536 bytes.
  • Privacy mode: hash_only
  • Available on: free, starter, pro, business, scale

Response envelope

{
  "request_id": "01K...",
  "tool": "steel-weight-calculator",
  "tool_version": "2026-04-22",
  "credits_used": 1,
  "result": { ... }
}

Try it

Stored only in this browser tab. Playground test key is prefilled and only works on this page. Get a live key →
round_bar | square_bar | hex_bar | flat_bar | plate | round_pipe | square_tube | rect_tube | angle
mild_steel | stainless_304 | stainless_316 | alloy_steel | tool_steel | galvanized_steel | cast_iron | aluminum | brass | copper | custom
Density in kg/m^3 (material=custom)
Primary dimension in mm: diameter, side, across-flats, or width
Second dimension in mm (rect_tube, angle)
Thickness or wall in mm (flat_bar, plate, pipes, tubes, angle)
Length per piece in meters

Get your own key

1,000 free calls/mo · no card · key arrives by email

One verification click, then your key + a ready-to-run request. No card, no spam.

Code examples

curl -X POST https://api.miniwebtool.com/v1/tools/steel-weight-calculator/run \
  -H 'Authorization: Bearer mwt_live_YOUR_KEY' \
  -H 'Content-Type: application/json' \
  -d '{"shape":"round_bar","material":"mild_steel","dim_a":20,"length_m":6,"quantity":10}'
import requests

resp = requests.post(
    'https://api.miniwebtool.com/v1/tools/steel-weight-calculator/run',
    headers={'Authorization': 'Bearer mwt_live_YOUR_KEY'},
    json={'shape': 'round_bar', 'material': 'mild_steel', 'dim_a': 20, 'length_m': 6, 'quantity': 10},
)
resp.raise_for_status()
data = resp.json()
print(data)
const resp = await fetch(
  'https://api.miniwebtool.com/v1/tools/steel-weight-calculator/run',
  {
    method: 'POST',
    headers: {
      'Authorization': 'Bearer mwt_live_YOUR_KEY',
      'Content-Type': 'application/json',
    },
    body: JSON.stringify({"shape":"round_bar","material":"mild_steel","dim_a":20,"length_m":6,"quantity":10}),
  }
);
const data = await resp.json();
console.log(data);
<?php
$ch = curl_init('https://api.miniwebtool.com/v1/tools/steel-weight-calculator/run');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_RETURNTRANSFER => true,
    CURLOPT_HTTPHEADER => [
        'Authorization: Bearer mwt_live_YOUR_KEY',
        'Content-Type: application/json',
    ],
    CURLOPT_POSTFIELDS => json_encode([
    'shape' => 'round_bar',
    'material' => 'mild_steel',
    'dim_a' => 20,
    'length_m' => 6,
    'quantity' => 10
]),
]);
$resp = curl_exec($ch);
curl_close($ch);
print_r(json_decode($resp, true));
require 'net/http'
require 'json'
require 'uri'

uri = URI('https://api.miniwebtool.com/v1/tools/steel-weight-calculator/run')
http = Net::HTTP.new(uri.host, uri.port)
http.use_ssl = (uri.scheme == 'https')

req = Net::HTTP::Post.new(uri)
req['Authorization'] = 'Bearer mwt_live_YOUR_KEY'
req['Content-Type'] = 'application/json'
req.body = {
  'shape' => 'round_bar',
  'material' => 'mild_steel',
  'dim_a' => 20,
  'length_m' => 6,
  'quantity' => 10
}.to_json

resp = http.request(req)
puts JSON.parse(resp.body).inspect
package main

import (
  "bytes"
  "encoding/json"
  "fmt"
  "io"
  "net/http"
)

func main() {
  body, _ := json.Marshal(map[string]interface{}{
    "shape": "round_bar",
    "material": "mild_steel",
    "dim_a": 20,
    "length_m": 6,
    "quantity": 10,
  })
  req, _ := http.NewRequest("POST", "https://api.miniwebtool.com/v1/tools/steel-weight-calculator/run", bytes.NewReader(body))
  req.Header.Set("Authorization", "Bearer mwt_live_YOUR_KEY")
  req.Header.Set("Content-Type", "application/json")

  resp, err := http.DefaultClient.Do(req)
  if err != nil { panic(err) }
  defer resp.Body.Close()
  out, _ := io.ReadAll(resp.Body)
  fmt.Println(string(out))
}
import java.net.URI;
import java.net.http.*;

var client = HttpClient.newHttpClient();
var req = HttpRequest.newBuilder()
    .uri(URI.create("https://api.miniwebtool.com/v1/tools/steel-weight-calculator/run"))
    .header("Authorization", "Bearer mwt_live_YOUR_KEY")
    .header("Content-Type", "application/json")
    .POST(HttpRequest.BodyPublishers.ofString("{\"shape\":\"round_bar\",\"material\":\"mild_steel\",\"dim_a\":20,\"length_m\":6,\"quantity\":10}"))
    .build();

var resp = client.send(req, HttpResponse.BodyHandlers.ofString());
System.out.println(resp.body());
how-to call steel-weight-calculator
  1. Get an API key
    Get an API key. Sign up free for a bearer token. 1,000 credits/month, no card.
  2. Assemble the JSON body
    Required fields: . See the Request body table above for the full schema.
  3. POST to https://api.miniwebtool.com/v1/tools/steel-weight-calculator/run
    Headers: Authorization: Bearer <key> and Content-Type: application/json. Copy-paste snippets in 7 languages are under Code examples.
  4. Parse the response
    Envelope: {request_id, tool, tool_version, credits_used, result}. The typed output lives in result.
faq frequently asked
What does the Steel Weight Calculator API do?+

Weight of steel and other metal bars, plates, pipes, tubes, and angles from shape dimensions, density, and quantity. Use it to add this utility without rebuilding formulas, validation, examples, and documentation.

How much does one call to Steel Weight Calculator cost?+

1 credit per successful call. Failed calls (validation errors, 5xx) don't bill.

What parameters does the Steel Weight Calculator API require?+

Required fields: (none). Full schema at /v1/openapi.json.

Is the Steel Weight Calculator API deterministic?+

Yes — same input, same output, forever. Tool version 2026-04-22; output shape is stable within a major version.

Can an AI agent call the Steel Weight Calculator API?+

Yes. Connect to https://api.miniwebtool.com/v1/mcp over the Model Context Protocol. The agent discovers `steel-weight-calculator` with its JSON Schema automatically, so the model can plan while MiniWebtool handles the exact tool result.

What format does the API return?+

JSON with a stable envelope: `{request_id, tool, tool_version, credits_used, result}`. Errors are RFC 7807 `application/problem+json`.

mcp use from an AI agent

Every endpoint on this site is also exposed via the Model Context Protocol at https://api.miniwebtool.com/v1/mcp. Claude, Cursor, and any MCP-capable agent can discover this tool (steel-weight-calculator) and its JSON Schema automatically — no client codegen.

# List tools the agent can call
curl -s https://api.miniwebtool.com/v1/mcp \
  -H 'Content-Type: application/json' \
  -d '{"jsonrpc":"2.0","id":1,"method":"tools/list"}' \
 | jq '.result.tools[] | select(.name=="steel-weight-calculator")'
see-also related construction tools