Round coordinate precision
Rounding 40.712812345, −74.006012345 to 4 decimals gives 40.7128, −74.006, a precision of about 11.132 m north to south. Choose 0 to 10 decimals to blur locations for privacy or trim excess GPS digits before storage. Free in your browser.
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Worked example
- Latitude
- 40.712812345
- Longitude
- -74.006012345
- Decimal places
- 4
- Latitude
- 40.7128
- Longitude
- -74.006
- Lat in
- 40.712812345
- Lon in
- -74.006012345
Geographic coordinates are often stored or published with more decimal places than the application needs. Six or seven digits after the decimal can locate a doorway; two or three digits locate a neighbourhood. This coordinate rounding tool accepts a latitude, a longitude, and an optional decimals count, then returns both values rounded to that precision with an approximate ground resolution in meters.
Why decimal places matter for latitude and longitude
Each extra decimal place in a geographic coordinate multiplies the ground resolution by roughly ten. At the equator, one degree of latitude is about one hundred eleven kilometres, so zero decimal places is city-scale, one place is tens of kilometres, two places is about a kilometre, three places is about one hundred metres, four places is about eleven metres, five places is about one metre, and six places is decimetre scale.
Longitude degrees shrink by the cosine of latitude, so the same decimal count is coarser near the poles than near the equator on the east–west axis. Latitude must stay inside negative ninety to ninety inclusive; longitude must stay inside negative one hundred eighty to one hundred eighty inclusive.
What you enter, what you get and what is refused
When decimals is omitted the default is four, a practical privacy and storage compromise of roughly eleven metres near the equator. Numeric strings that parse as finite numbers are accepted; empty strings, NaN, Infinity, and non-numeric text are rejected with a message that names the field.
Example: lat forty point seven one two eight one two three four five, lon negative seventy-four point zero zero six zero one two three four five, decimals four yields lat forty point seven one two eight and lon negative seventy-four point zero zero six zero with an approximate precision near eleven metres. Invalid ranges and missing coordinates are not billed.
Where coordinate rounding earns its keep in production
Privacy and compliance teams round drop-off points before publishing heat maps so a single visit cannot identify a home or clinic. Mobile analytics pipelines drop excess GPS digits to cut storage and to stop accidental re-identification when datasets are later joined. Map product backends cluster markers by shared rounded keys without standing up a full spatial database for every dashboard.
Open-data portals that publish facility lists often commit to a stated precision—four decimals for city blocks, two for regional coverage—and need a deterministic oracle that matches that policy on every row. Classroom and GIS tutorials use the same tool to show how many metres each decimal place buys, using the approximate precision fields instead of hand-waving. Failed validation does not consume balance.
Keep requests small, pin the rounded outputs and precision meters in tests, and you get reproducible redaction for edge workers, ETL jobs, and free browser widgets without inventing a one-off Math.round helper in every service.
What you can do with it
Privacy masking before publish
Round customer or device GPS to three or four decimals before heat maps, exports, or third-party analytics so street-level positions are not retained.
Documented open-data precision
Enforce a stated public precision (for example four decimals) across every facility row so published coordinates match the portal’s privacy notice.
FAQ
How do I round latitude and longitude to N decimal places?
Send finite lat (−90…90), lon (−180…180), and optional decimals (0–10, default 4).
What does four decimal places mean on the ground?
About eleven metres of latitude arc near any latitude, and about eleven metres of longitude arc near the equator (less toward the poles).
Does rounding wrap longitude past ±180?
Valid inputs stay inside the ranges after rounding; boundaries such as 90 or 180 are allowed.
Is this the same as a general number rounder?
No. This tool is built for geographic pairs: it validates Earth ranges, rounds both axes together, and reports approximate meters of precision. For arbitrary numbers use a general rounding tool.
How are halfway values rounded?
Away from zero. Each coordinate is multiplied by ten to the power of the decimals, rounded to the nearest whole number with ties moving away from zero, then divided back, so positive and negative coordinates are treated symmetrically.
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/geo/coordinate-round \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"lat":40.712812345,"lon":-74.006012345}'const res = await fetch("https://api.kit.forhosting.com/geo/coordinate-round", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"lat": 40.712812345,
"lon": -74.006012345
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/geo/coordinate-round",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"lat": 40.712812345,
"lon": -74.006012345
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/geo/coordinate-round", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"lat":40.712812345,"lon":-74.006012345}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"lat":40.712812345,"lon":-74.006012345}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/geo/coordinate-round", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"lat": 40.712812345,
"lon": -74.006012345
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "geo.coordinate_round",
"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
Use it to strip GPS noise before analytics, to anonymise locations before sharing maps, or to shrink payloads when full floating-point precision is wasteful.
Why decimal places matter for latitude and longitude
Rounding both axes to the same decimals is still the industry convention for storage keys, clustering buckets, and privacy redaction because it is simple, reversible only up to the discarded remainder, and easy to document in a schema. This capability implements half-away-from-zero rounding of each axis independently: multiply by ten to the power of decimals, round to the nearest integer with ties moving away from zero, divide back, and clean residual binary floating-point noise so JSON goldens stay stable across runtimes. Values outside those closed ranges fail with invalid_input rather than wrapping silently, which would invent a different place on Earth. The response echoes the original lat and lon as lat_in and lon_in so you can audit how much was discarded without replaying the request log.
Input contract, response fields, and error behaviour
POST a JSON body with required finite numbers lat and lon in decimal degrees, and optional integer decimals from zero through ten. Field aliases are accepted: latitude for lat; longitude or lng for lon; places, precision, or dp for decimals. On success the body includes lat and lon rounded to the requested places; decimals as applied; lat_in and lon_in as received after numeric coercion; approx_precision_lat_m and approx_precision_lon_m estimating the ground size of one unit in the last place at the rounded latitude; approx_precision_m as the larger of those two axes for a conservative privacy reading; method equal to decimal_places; and a short formula string restating the multiply-round-divide rule. Pair this endpoint with your own geohash or tile tools if you need a grid cell identifier; this capability only reduces floating-point precision and does not encode cells or project to Web Mercator.
Integration use cases
Compact storage and clustering keys
Store lat/lon with a fixed decimal policy to shrink payloads and to group nearby points that share the same rounded coordinate key.
Technical questions
What does the coordinate precision rounder cost?
The browser tool is free. API requests use prepaid KIT balance at $0.002 per successful call; invalid input is not billed.