Click on "Deploy Server".
Wait a few minutes for the server to deploy. Once ready, it will show a "Started" state.
In the chat, type @ followed by the MCP server name and your instructions, e.g., "@takeoffmetric-mcp How much concrete for a 24 ft by 16 ft slab, 5 in thick, at $165 per cubic yard?"
That's it! The server will respond to your query, and you can continue using it as needed.
Here is a step-by-step guide with screenshots.
A Model Context Protocol server (stdio) that runs the construction calculators of TakeoffMetric (https://takeoffmetric.com/) from an MCP client. It ships 15 calculators, a tool that lists them, and a search over a table of estimating constants in which every row names its published source.
The calculators are not re-implemented here. The site's TypeScript engine is bundled unchanged into
vendor/engine.mjs, and the test suite checks that each tool returns what the engine source computes.
Requires Node.js 20 or later.
npx -y takeoffmetric-mcpClaude Desktop (claude_desktop_config.json):
{
"mcpServers": {
"takeoffmetric": {
"command": "npx",
"args": ["-y", "takeoffmetric-mcp"]
}
}
}Claude Code:
claude mcp add takeoffmetric -- npx -y takeoffmetric-mcpRelated MCP server: macalc
Tool | What it returns |
| Concrete volume, order quantity, bags, truck loads and weight for a slab, with extra sections and an optional thickened edge. |
| Concrete cost from your own delivered price, with short-load fee, delivery, and bags compared with ready-mix. |
| Bar count each way, lap splices, stock bars, weight, intersections and supports for a slab grid or a continuous footing. |
| Cubic yards, short tons and metric tonnes of gravel, stone or rock, with the compaction conversion and a truck count. |
| Cubic yards, tons and truck loads of fill dirt, loose or in place. |
| Cubic yards, short tons and a bag count for sand, by moisture condition. |
| Cubic yards, bags, weight and coverage of topsoil for a lawn, a top-dressing pass, a garden bed or a raised box. |
| Cubic yards, cubic feet and cubic meters over several areas, the area a volume covers, swell, bags and truck trips. |
| Short tons and metric tonnes of hot mix by course and by area, with the spread rate. |
| Board feet, lineal feet, pieces and cost for a lumber order of several sizes. |
| Squares, shingle bundles, underlayment rolls, ridge cap and starter from the plan footprint and the pitch. |
| Rise in 12, angle, grade and slope factor from any one of them, plus ridge height and common rafter length from a span. |
| Posts, rails, pickets, gates and post-hole concrete for a fence line. |
| Round and rectangular duct size from airflow and a friction rate or velocity limit, what a duct carries, and a reducing trunk. |
| Crushed stone base, bedding sand and excavation depth under a paver patio, driveway or street. |
Two more tools complete the server:
list_calculators: tool name, title, page URL, one-line description and input keys of each calculator.
search_constants: rows of the constants table matched by a substring (query) and/or a category, 50 rows at most per call.
Each calculator's input schema is generated at start-up from the engine's own input list, so keys, bounds, options and defaults are the ones of the matching form on the site.
Every input is optional. A key you leave out takes the engine default, as an untouched form field does.
system is "imperial" (default) or "metric". It sets the unit the numbers are typed in and the defaults.
A length is a number in the unit named in its description, or a string that carries its unit, such as "20 ft 6 in".
An unknown key or an out-of-range value returns isError: true with one message per field. Nothing is computed from a clamped value.
A JSON text block: calculator, url, system, engine_version, revised, inputs_used, primary, secondary,
takeoff, warnings, assumptions. inputs_used is the engine's normalized input (lengths in metres). assumptions
lists what the result rests on, and warnings carries the cautions the page would show.
Request (tools/call, tool calc_concrete_slab):
{"length":24,"width":16,"thickness":"5 in","price":165}Response, copied from a run of this server (whitespace condensed):
{
"calculator": "calc_concrete_slab",
"url": "https://takeoffmetric.com/concrete/concrete-calculator/",
"system": "imperial",
"engine_version": "1.2.0",
"revised": "2026-09-19",
"inputs_used": {"system":"imperial","sections":[{"length":7.315200000000001,"width":4.8768},{"length":0,"width":0},{"length":0,"width":0}],"thickness":0.127,"wastePct":10,"bagSize":"60","pricePerCuYd":165,"thickenedEdge":false,"edgeDepth":0.30479999999999996,"edgeWidth":0.30479999999999996,"gravelDepth":0.1016,"unitWeight":150,"truckCuYd":10,"minLoadCuYd":null,"shortLoadFee":null},
"primary": {"value":6.52,"unit":"cuyd","label":"Concrete volume","precision":2},
"secondary": [
{"value":6.75,"unit":"cuyd","label":"Order quantity","precision":2},
{"value":176,"unit":"cuft","label":"Concrete volume","precision":1},
{"value":384,"unit":"sqft","label":"Slab area","precision":0},
{"value":26400,"unit":"lb","label":"Concrete weight","precision":0},
{"value":392,"unit":"bag","label":"60 lb bags","precision":0},
{"value":1,"unit":"load","label":"Truck loads","precision":0},
{"value":10,"unit":"ft","label":"Control-joint spacing","display":"10'-0″ to 15'-0″"},
{"value":1113.75,"unit":"usd","label":"Estimated concrete cost","precision":2}
],
"takeoff": [
{"key":"readymix","item":"Ready-mix concrete","qty":5.93,"unit":"cuyd","waste":10,"order":6.75,"orderUnit":"cuyd","note":"Rounded up to the nearest 0.25 cu yd."},
{"key":"bags","item":"Bagged concrete mix, 60 lb","qty":176,"unit":"cuft","waste":10,"order":392,"orderUnit":"bag","note":"0.45 cu ft per bag."},
{"key":"trucks","item":"Ready-mix truck loads","qty":6.52,"unit":"cuyd","order":1,"orderUnit":"load","note":"10 cu yd per load (your assumption)."},
{"key":"gravel","item":"Compacted base, 4″","qty":4.74,"unit":"cuyd","order":6.5,"orderUnit":"cuyd","note":"Loose volume ordered = compacted volume x 1.31 (3,570 / 2,730 lb/cu yd, FHWA Exhibit 5.1 A, gravel dry, average gradation; 1.17 uniformly graded, 1.49 well graded). For estimating purposes, ±33%: a highway embankment, not a plate-compacted base."},
{"key":"cost","item":"Concrete cost at your price","qty":6.75,"unit":"cuyd","order":1113.75,"orderUnit":"usd","note":"6.75 cu yd x $165.00 / cu yd."}
],
"warnings": [
{"level":"caution","code":"too-many-bags","message":"392 bags is a day of mixing. Price a ready-mix delivery instead."}
],
"assumptions": [
"Volume = length x width x thickness; 1 cubic yard = 27 cubic feet.",
"Waste allowance 10% applied to the net volume.",
"Ready-mix rounded up to 0.25 cu yd; truck capacity 10 cu yd (editable).",
"Bag yield 0.45 cu ft per 60 lb bag of standard concrete mix.",
"Unit weight 150 lb/cu ft (editable; normal-weight concrete runs about 140-155).",
"Contraction joints at 24-36 times the slab thickness, capped at 15 ft (NRMCA CIP 6).",
"Thickness, reinforcement and base depth come from your drawings or local code."
]
}Formulas, constants and rounding rules come from the engine bundle. vendor/ENGINE_COMMIT.txt records the commit it
was built from, and every response carries the calculator's engine_version and revised date.
Each tool computes with the same engine as its page on the site. calc_gravel, for instance, runs the engine
behind https://takeoffmetric.com/earthwork/gravel-calculator/.
search_constants reads vendor/constants.csv (148 rows). Each row gives the value, its unit, the SI value, the
condition it applies to, and the publisher, title and URL of the document it was read from.
The site's methodology (tested formulas, assumptions shown on the page, sources as documents, versioned sheets) is at https://takeoffmetric.com/methodology/.
Results are estimates. Confirm quantities with your plans, your supplier and your local code before ordering or building.
This release covers 15 calculators. Calculators that apply building-code provisions, or that rely on third-party tables the site links to without reproducing them, are not part of it.
Responses carry numbers and notes only: no drawing and no CSV export.
unit fields use the engine's unit codes. Several results that are not plain counts are coded ea; read label
and display for their meaning.
Prices are whatever you type in. The server holds no price data and makes no network request.
Transport is stdio only.
npm install
npm testThe tests run with this repository alone. npm run sync-engine and npm run make-fixtures are maintainer scripts:
they rebuild vendor/ and test/fixtures.json from the site's source repository, which users of the package never need.
Server code: MIT. Calculation engine (vendor/engine.mjs): copyright TakeoffMetric, distributed with this package to run
as part of it, not licensed for modification or separate redistribution. Both are set out in LICENSE.
Constants table: CC BY 4.0, see DATA_LICENSE.md.
This server cannot be deployed
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