Roman chronogram calculator
In the phrase “aMore paVLVs” the Roman letters M, V, L and V add up to 1060. Type any phrase and the calculator finds every M, D, C, L, X, V and I, lists them in order and gives the year they spell. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
Run — free
Worked example
- Text
- aMore paVLVs
- Letters
- M, V, L, V
- Year value
- 1,060
Sum Roman numeral letter values embedded in a phrase. Search intent: roman chronogram calculator. No network calls or random seeds are required. Failed jobs are not billed.
How a chronogram hides a year
A chronogram is a phrase in which some letters double as Roman numerals, so that adding them up reveals a year. The seven letters that count are M for 1000, D for 500, C for 100, L for 50, X for 10, V for 5 and I for 1; every other letter is ignored. In “aMore paVLVs” that leaves M, V, L and V, which add up to 1000 plus 5 plus 50 plus 5, or 1060. The calculator lists the letters it found in the order they appear, so you can check each one against the phrase.
Simple addition, and the mistakes it avoids
Unlike an ordinary Roman numeral, a chronogram is read by plain addition: the position of a letter never matters and nothing is subtracted, so a V written before an L adds 5 instead of taking it away. The most common slip when counting by hand is to miss a letter hidden inside a word, or to forget that an I or a V in an ordinary word counts just as much as the others. Pasting the whole phrase lets the calculator catch every letter at once.
What you can do with it
Teaching
Pinned goldens.
FAQ
What is each Roman letter worth?
M is worth 1000, D 500, C 100, L 50, X 10, V 5 and I 1. Any other letter in the phrase adds nothing to the total.
Does the order of the letters matter?
No. In a chronogram the letters are simply added and never subtracted, unlike an ordinary Roman numeral. A V written before an L adds 5 instead of taking it away.
Can I see which letters were counted?
Yes. Along with the year, the calculator shows the list of Roman letters it found, in the order they appear in the phrase, so you can check them one by one.
Do the other letters in the phrase change the result?
No. Only the seven Roman letters count and everything else is ignored. In “aMore paVLVs” the letters a, o, r, p and s add nothing; the year comes from M, V, L and V alone.
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/math/roman-chronogram \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"text":"aMore paVLVs"}'const res = await fetch("https://api.kit.forhosting.com/math/roman-chronogram", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"text": "aMore paVLVs"
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/math/roman-chronogram",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"text": "aMore paVLVs"
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/math/roman-chronogram", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"text":"aMore paVLVs"}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"text":"aMore paVLVs"}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/math/roman-chronogram", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"text": "aMore paVLVs"
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "math.roman_chronogram",
"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
The calculator is free in the browser, deterministic, and identical on the API path. Inputs are validated before arithmetic so invalid payloads fail with invalid_input. Half-up rounding is applied once from raw IEEE values when decimals are requested. Use the same JSON from spreadsheets, CMS, automation, or teaching demos.
How it works
Sum Roman numeral letter values embedded in a phrase. No network calls or random seeds are required. Failed jobs are not billed. No network calls or random seeds are required. Failed jobs are not billed. M=1000,D=500,C=100,L=50,X=10,V=5,I=1. The calculator is free in the browser, deterministic, and identical on the API path. Inputs are validated before arithmetic so invalid payloads fail with invalid_input. Half-up rounding is applied once from raw IEEE values when decimals are requested. Use the same JSON from spreadsheets, CMS, automation, or teaching demos. The calculator is free in the browser, deterministic, and identical on the API path. Inputs are validated before arithmetic so invalid payloads fail with invalid_input. Half-up rounding is applied once from raw IEEE values when decimals are requested. Use the same JSON from spreadsheets, CMS, automation, or teaching demos.
Inputs, limits and rounding
Optional decimals use half-up once. Outputs echo inputs. No network calls or random seeds are required. Failed jobs are not billed. No network calls or random seeds are required. Failed jobs are not billed. Provide required JSON fields. Invalid types raise invalid_input. The calculator is free in the browser, deterministic, and identical on the API path. Inputs are validated before arithmetic so invalid payloads fail with invalid_input. Half-up rounding is applied once from raw IEEE values when decimals are requested. Use the same JSON from spreadsheets, CMS, automation, or teaching demos. The calculator is free in the browser, deterministic, and identical on the API path. Inputs are validated before arithmetic so invalid payloads fail with invalid_input. Half-up rounding is applied once from raw IEEE values when decimals are requested. Use the same JSON from spreadsheets, CMS, automation, or teaching demos.
When to use it
Use when search intent matches. Sum Roman numeral letter values embedded in a phrase. No network calls or random seeds are required. Failed jobs are not billed. No network calls or random seeds are required. Failed jobs are not billed. The calculator is free in the browser, deterministic, and identical on the API path. Inputs are validated before arithmetic so invalid payloads fail with invalid_input. Half-up rounding is applied once from raw IEEE values when decimals are requested. Use the same JSON from spreadsheets, CMS, automation, or teaching demos. The calculator is free in the browser, deterministic, and identical on the API path. Inputs are validated before arithmetic so invalid payloads fail with invalid_input. Half-up rounding is applied once from raw IEEE values when decimals are requested. Use the same JSON from spreadsheets, CMS, automation, or teaching demos.
Integration use cases
Quick check
Free widget.
Automation
Same JSON via API.
Technical questions
Free?
Yes tier A.
Network?
No.
Bad input?
invalid_input.
API?
Yes.
Locales?
EN-only; Nitro hydrates.