Aluminum weight calculator
A bar 1 m long, 0.1 m wide and 0.01 m thick at 2700 kg/m³ weighs 2.7 kg. Enter the three sizes in metres and your alloy's density, such as 7075 at 2810, to plan stock or freight. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Length
- 1
- Width
- 0.1
- Height
- 0.01
- Density
- 2,700
- Volume m3
- 0.001 kg
- Weight (kg)
- 2.7
- Weight
- 2.7
Fabricators, metal buyers, and shop estimators need the mass of an aluminum piece before they cut stock, quote freight, or load a truck. This aluminum weight calculator takes the three orthogonal dimensions of a rectangular piece—length, width, and height (or thickness)—together with the bulk density of the alloy, and returns the mass in kilograms. The physics is the same as any homogeneous solid: volume is the product of the three lengths, and mass is volume times density. Pure aluminum is about 2700 kilograms per cubic metre; common 6000-series plate sits near that figure, while 7075 is slightly denser. Because density is an input, the same contract covers plate, bar, and block in any common alloy without baking a single grade into the formula.
How aluminum weight is computed from dimensions and density
A rectangular aluminum piece is modelled as a right rectangular prism. Volume in cubic metres is length times width times height, where every length is in metres. Mass in kilograms is that volume multiplied by the alloy density in kilograms per cubic metre.
Pure wrought aluminum and 6061 typically sit near 2700 kilograms per cubic metre; 5052 is similar; 7075 is closer to 2810; some cast alloys run a little lower because of porosity and silicon. Passing density as a number rather than hiding a single table inside the solver is deliberate: a shop that cuts 7075 plate would be billed the wrong kilograms if the page silently assumed 2700. Height is the third orthogonal size; for sheet and plate that is the thickness, including the decimal millimetre converted to metres.
The calculator does not subtract holes, slots, tapers, or saw kerf, and it does not add a drop percentage; those are job-specific factors applied after the solid take-off so a quote stays transparent. All four inputs must be strictly positive finite numbers. A zero or negative length cannot be a piece, a zero thickness is not plate, and a non-positive density is not a physical metal.
What you send, which units to use, and how validation fails
Convert millimetres to metres by dividing by one thousand before you call; convert grams per cubic centimetre to kilograms per cubic metre by multiplying by one thousand. Mixing millimetres of length with a density of 2.70 without converting would understate mass by six orders of magnitude, so the contract keeps one SI set and leaves conversion to the caller. A one-metre by 0.1-metre by 0.01-metre bar at 2700 kilograms per cubic metre yields 0.001 cubic metres and 2.7 kilograms.
Validation failures name the offending field so a form can highlight length when someone types zero, or density when a spreadsheet leaked a negative. Upper and lower limits keep intermediate products finite: each field must be at least 1e-15 and at most 1e12.
Where an aluminum weight calculator earns its keep
Job shops and CNC houses estimate blank mass before they nest plate so they can quote material plus chips instead of guessing from a catalogue photo. Metal distributors and e-commerce cut-to-size desks need a kilogram figure that matches the public calculator when a customer pastes length, width, and thickness into a storefront. Freight and parcel teams convert those kilograms into chargeable weight for air or LTL, which is a different search from billable-weight dimensional factors and belongs on this landing because the question is the metal mass itself.
Curriculum authors can pin goldens: one metre by one tenth by one hundredth at 2700 must stay 2.7 kilograms. If you later need steel weight, copper bus-bar mass, hollow-tube take-off, or millimetre-to-metre conversion as a first-class form, treat those as separate search intents rather than overloading this aluminum-weight page. The tool is a solid rectangular take-off, not a substitute for a mill certificate, a hydrostatic weigh, or a CAD mass property on a part with pockets.
What you can do with it
Quote aluminum plate and bar by the kilogram
Shops enter length, width, thickness, and alloy density to price a rectangular blank before cutting, so the material line on the quote matches the public calculator.
Freight mass for cut-to-size aluminum
Distributors and parcel desks convert a plate or bar into kilograms for shipping labels without opening a CAD mass-properties panel.
Classroom density checks on aluminum samples
Teachers and LMS auto-graders verify that volume times 2700 kg/m³ yields the expected kilogram mass for a measured rectangular sample.
FAQ
How do I calculate the weight of an aluminum piece in kilograms?
Send positive length, width, and height in metres plus alloy density in kg/m³.
What density should I use for aluminum?
Pure aluminum and 6061 are about 2700 kg/m³. 7075 is about 2810 kg/m³. Use the mill or handbook figure for the alloy you will actually cut; density is a required input so the solver does not guess the grade.
What happens if a dimension is zero or negative?
Length, width, height, and density must all be positive; a non-positive dimension cannot be a physical aluminum piece and is not billed.
Are the dimensions in millimetres or metres?
Metres. Divide millimetre readings by 1000 before calling. Density is kg/m³ (multiply g/cm³ by 1000). Mixing millimetres with 2.70 g/cm³ without converting would understate the mass.
Does the weight account for holes, slots or saw kerf?
No. The result is the weight of the solid rectangular piece. Holes, slots, tapers, saw kerf and drop allowances are job-specific, so subtract or add them afterwards to keep your quote transparent.
Related tools
For developers — API access
Everything on this page is available programmatically. This section is for teams who want to wire it into their own systems; everyone else can just use the tool above.
API endpoint
Prefer to automate it? One authenticated POST creates the task; the result comes back by webhook or a signed link. The same capability also runs here on the web, by email and from Telegram — and soon from our app too.
Call it from your stack
curl -X POST https://api.kit.forhosting.com/build/aluminum-weight \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"length":1,"width":0.1,"height":0.01,"density":2700}'const res = await fetch("https://api.kit.forhosting.com/build/aluminum-weight", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"length": 1,
"width": 0.1,
"height": 0.01,
"density": 2700
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/build/aluminum-weight",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"length": 1,
"width": 0.1,
"height": 0.01,
"density": 2700
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/build/aluminum-weight", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"length":1,"width":0.1,"height":0.01,"density":2700}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"length":1,"width":0.1,"height":0.01,"density":2700}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/build/aluminum-weight", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"length": 1,
"width": 0.1,
"height": 0.01,
"density": 2700
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "build.aluminum_weight",
"status": "queued",
"_links": {
"result": "/tasks/tsk_…/result"
}
}The API is asynchronous: the call returns a task_id immediately and the result arrives by webhook. Polling is capped at 1 req/s per task.
Pricing
Published price — no tokens, no invented credits. A failed task is never charged.
Limits
max_dim | 1000000000000 |
min_dim | 1e-15 |
Errors
| HTTP | Code | Meaning |
|---|---|---|
401 | unauthorized | Missing or invalid API key. |
402 | insufficient_balance | Your balance doesn't cover the task price. |
404 | unknown_type | That task type doesn't exist. |
429 | rate_limited | Too many requests. Use the webhook instead of polling. |
Technical notes
Missing, zero, or negative dimensions fail with invalid_input and are not billed.
How aluminum weight is computed from dimensions and density
The identity is the definition of density rearranged for mass: mass equals density times volume, so weight_kg equals length times width times height times density when those SI units are used. The same three lengths always produce the same volume, and the same volume and density always produce the same kilogram figure after fixed twelve-decimal rounding, so goldens, widgets, and API clients never disagree on a 2.7 kilogram bar that is one metre by one hundred millimetres by ten millimetres at 2700 kilograms per cubic metre.
What you send, which units to use, and how validation fails
Send four required numeric fields. length is a finite positive number for the long edge in metres. width is a finite positive number for the second plan dimension in metres. height is a finite positive number for the third dimension in metres; aliases thickness, thick, t, and depth are accepted so plate take-offs do not need a rename. density is a finite positive number for alloy density in kilograms per cubic metre; aliases rho, aluminum_density, and density_kg_m3 are recognized. Strings that parse as finite numbers are accepted the same as JSON numbers. On success the response echoes the cleaned inputs, publishes volume_m3 as the product of the three lengths, weight_kg as that volume times density, weight as an alias of weight_kg, unit as kg, and formula as the string weight_kg equals length times width times height times density. Failed tasks return invalid_input and do not consume prepaid balance. Successful API calls use the published base of $0.002 per item.
Technical questions
What does the aluminum weight calculator cost?
The browser tool is free. API requests use prepaid KIT balance at $0.002 per successful call; invalid input is not billed.