Weird units converter
Treat odd length names as real distances: one fathom is 1.8288 metres and a hand, the unit for horse height, is 0.1016 metres. Every pair runs through exact inch-based metre factors, from campus folklore to racecourses and old building plans. Free in your browser.
- Free
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- No sign-up
- Your data stays on your device
Run — free
Worked example
- Value
- 1
- From
- Furlong
- To
- Cubit
- Result
- 440 cubit
- Input
- 1
- Meters
- 201.168
Unusual length units survive in campus folklore, horse sports, nautical logs, and ancient building trades, and they still need arithmetic that treats a smoot or a cubit as a real distance. This weird units converter takes a non-negative finite length plus a source unit and a target unit from a closed vocabulary: smoot, furlong, cubit, fathom, chain, rod, league, barleycorn, hand, ell, and metre as the SI reference. Every pair is converted through exact metre factors derived from the international inch and foot, so a smoot-to-furlong result and a cubit-to-metre result share one definition of length.
Unusual units, exact metre factors, and why a smoot is a length
Campus folklore, horse racing, sailing, and ancient building trades still speak in length names that never appear on a supermarket tape. A smoot is the 1958 MIT joke that became a real unit: Oliver Smoot’s height of sixty-seven international inches, which is exactly 1.7018 metres, painted along the Harvard Bridge as 364.4 smoots plus or minus one ear. A furlong is one-eighth of an international mile, two hundred and twenty yards, or six hundred and sixty feet, which is exactly 201.168 metres, and it remains the distance language of racecourses.
A cubit in this converter is the English cubit of eighteen inches, exactly 0.4572 metres, a convenient teaching value that matches many biblical and historical worksheets even though royal cubits used elsewhere differ.
The remaining names are equally definitional: a fathom is six feet (1.8288 m), a Gunter chain is sixty-six feet (20.1168 m), a rod (also called a pole or perch) is sixteen and a half feet (5.0292 m), a land league is three international miles (4828.032 m), a barleycorn is one-third of an inch, a hand is four inches (0.1016 m) as used for horse height, and an English ell is forty-five inches (1.143 m).
The metre is accepted as an SI reference so you can ask how long a smoot is without leaving this vocabulary. Every conversion multiplies the source value by its metre factor and divides by the target factor, so there is no pairwise matrix that can drift. Those factors come from the 1959 international inch of 0.0254 metres and the international foot of 0.3048 metres; they do not follow a browser locale or a survey-foot variant.
How to enter lengths and unit names
The value must be a finite non-negative number or a strict numeric string; zero is a valid length of nothing, but a negative number is rejected because a physical length in these units is not a signed offset. The from and to fields must be unit names from the closed set: smoot, furlong, cubit, fathom, chain, rod, league, barleycorn, hand, ell, and meter. Missing fields, empty strings, NaN, Infinity, and non-numeric phrases fail the same way and are not billed.
On success the body echoes the parsed input, the canonical from and to names, result as the converted length, unit matching the canonical target, meters as the SI pivot, a formula string that restates the metre factors, and a short English message you can paste into a worksheet. Prefer this contract when both names are already in the unusual-unit set; a general metric-imperial converter is the wrong landing if you arrived looking for smoots or cubits.
Where a weird-units converter earns its keep
Teachers and quiz generators need a deterministic oracle that converts one furlong into four hundred and forty English cubits, or three hundred and sixty-four point four smoots into metres, without a student-facing spreadsheet that hides the factor. Horse-sports sites convert hands into metres for an international listing, then back into hands for a barn chart. History classrooms convert cubits into metres when a textbook quotes an ark or a temple in cubits and a lab wants SI.
Nautical clubs still talk in fathoms; survey lore still talks in chains and rods; a league remains a useful three-mile teaching length. The browser tool is free. Keep values inside the published magnitude range, pin the rounded result in tests, and you get reproducible unusual-unit arithmetic without standing up a computer-algebra system of your own.
What you can do with it
Racecourse and survey worksheets
Turn furlongs into chains, rods, or metres for a racing programme or a historical survey lesson that still speaks Gunter’s chain.
FAQ
Which unusual units can this converter handle?
The closed set is smoot, furlong, cubit, fathom, chain, rod, league, barleycorn, hand, ell, and meter.
How long is a smoot, a furlong, and a cubit in metres?
One smoot is 1.7018 m (67 international inches). One furlong is 201.168 m (660 feet, one-eighth of an international mile). One English cubit here is 0.4572 m (18 inches).
Why are negative lengths rejected?
A length in smoots, furlongs, or cubits is a physical distance, not a signed offset. Zero is allowed and converts to zero.
Which cubit definition do you use?
The English cubit of eighteen international inches (0.4572 m). This is not a royal cubit of about 52.3 cm; that historical variant is outside this closed set.
How many cubits fit in a furlong?
Exactly 440. A furlong is 201.168 metres and the English cubit is 0.4572 metres, so dividing one by the other gives 440 with no rounding at all.
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/conv/weird-units \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"value":1,"from":"furlong","to":"cubit"}'const res = await fetch("https://api.kit.forhosting.com/conv/weird-units", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"value": 1,
"from": "furlong",
"to": "cubit"
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/conv/weird-units",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"value": 1,
"from": "furlong",
"to": "cubit"
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/conv/weird-units", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"value":1,"from":"furlong","to":"cubit"}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"value":1,"from":"furlong","to":"cubit"}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/conv/weird-units", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"value": 1,
"from": "furlong",
"to": "cubit"
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "conv.weird_units",
"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.
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
Negative values and unknown unit names fail with invalid_input instead of inventing a number.
Input contract, rounding, aliases, and error behaviour
POST a JSON body with three required fields: value, from, and to. Singular and plural forms are accepted and folded to the canonical singular, as are British spelling metre and metres, the short alias m, and the historical aliases pole, poles, perch, and perches for rod. Unknown names, including everyday units this landing does not serve as primary targets such as kilometres or miles, fail with invalid_input that names the field. Absolute magnitude is capped so a Worker isolate cannot overflow a multiply into a non-finite result.
Where a weird-units converter earns its keep
Successful API requests use prepaid KIT balance at $0.002 per item; invalid_input is not billed, so exploratory scripts that misspell a unit stay cheap.
Integration use cases
Campus folklore and the Harvard Bridge
Convert 364.4 smoots into metres (or cubits) for a walking-tour page, then reject a negative smoot so the widget cannot print a nonsense signed length.
History class cubits and horse hands
Map English cubits or horse-height hands into metres for a lab write-up, using the same factors the API will use in an auto-grader.
Technical questions
What does the weird units converter cost?
The browser tool is free. API requests use prepaid KIT balance at $0.002 per successful call; invalid input is not billed.