Calculate baseball batting average
125 hits in 412 at-bats is a .303 batting average: the raw 0.303398 is rounded to three places and shown with the leading zero dropped, as scoreboards write it. Zero at-bats is refused, never shown as infinity. Free in your browser.
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Worked example
- Hits
- 125
- At bats
- 412
- Average
- 0.303
- Display
- .303
The batting average calculator takes a player's hits and at-bats and returns the batting average rounded to three decimal places, exactly the way it appears in box scores, record books and league leaderboards. You send two numbers; you get back the average both as a plain number and in the traditional display form, like ".303", that baseball has used for over a century.
What a batting average actually measures
Batting average is the oldest and simplest measure of a hitter: hits divided by at-bats. A player with 125 hits in 412 at-bats is batting .303, and that single figure compresses an entire season into one comparable number. It is deliberately narrow — it ignores walks, hit-by-pitches and sacrifice flies, because none of those count as at-bats under the official scoring rules.
That narrowness is precisely why the formula matters: if you included plate appearances instead of at-bats you would get a different, lower number, and it would not be a batting average at all. The batting average calculator implements the official definition only. It does not try to compute on-base percentage or slugging, it does not guess which events count, and it refuses the one input that makes the statistic undefined: zero at-bats, because dividing by zero produces a number with no meaning on a leaderboard.
Why the result is rounded to three decimals
Baseball has written batting averages with three decimal places since the nineteenth century, and the convention is load-bearing: batting titles have been decided by the third decimal. The raw quotient of hits over at-bats is almost never a clean number — 125 over 412 is 0.303398... — so the calculator rounds to exactly three places using standard string rounding and returns both the numeric value, 0.303, and the traditional display string, ".303", with the leading zero dropped the way scoreboards and newspapers write it.
Using it in apps, spreadsheets and pipelines
Because hits can never exceed at-bats, the validator rejects that combination up front instead of silently returning an average above 1.000 that would corrupt a leaderboard; because a player with no at-bats has no average, zero at-bats returns a clean invalid-input error rather than an infinity or a NaN. Sports apps call it when a game ends to refresh a player's season line; statisticians batch it over roster exports; fantasy platforms embed it so the number shown to users is computed the same way as the number stored.
What you can do with it
Update a player's season line
After each game, add the new hits and at-bats to the season totals and recompute the average a leaderboard shows.
Batch-process a roster export
Loop over a team's hits and at-bats columns and get three-decimal averages for every player in one pass.
Teach the statistic correctly
Show students why 3 hits in 10 at-bats is .300 and why walks do not count, with a calculator that enforces the official definition.
FAQ
What happens if at-bats is zero?
A batting average with no at-bats is undefined, so no number is returned.
How is the average rounded?
To exactly three decimal places, per standard baseball convention. The result is deterministic: the same inputs always produce the same output.
Do walks or sacrifices count as at-bats?
No. Under official scoring rules they are not at-bats, so they must not be included in the at-bats figure you send.
Why does the display string start with a dot?
Baseball tradition writes averages below 1.000 without the leading zero — ".303" instead of "0.303". Both forms are returned.
Can hits be greater than at-bats?
No, and the calculator rejects that input. An average above 1.000 is impossible by definition.
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/sports/batting-average-calc \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"hits":125,"at_bats":412}'const res = await fetch("https://api.kit.forhosting.com/sports/batting-average-calc", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"hits": 125,
"at_bats": 412
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/sports/batting-average-calc",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"hits": 125,
"at_bats": 412
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/sports/batting-average-calc", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"hits":125,"at_bats":412}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"hits":125,"at_bats":412}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/sports/batting-average-calc", body)
req.Header.Set("Authorization", "Bearer "+os.Getenv("KIT_KEY"))
req.Header.Set("Content-Type", "application/json")
res, _ := http.DefaultClient.Do(req)Example request
{
"hits": 125,
"at_bats": 412
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "sports.batting_average_calc",
"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
It runs the same deterministic formula in your browser for free and through the API for automation, so the number you see on this page is the number your pipeline receives.
Using it in apps, spreadsheets and pipelines
The API accepts a hits count and an at-bats count and returns the average, the display string and the formula that produced them, in one small JSON object. The same module runs free in the browser on this page, and automating it costs $0.002 per request — one price, no per-row metering, because the input is always exactly two numbers.
Technical questions
What does it cost?
$0.002 per request via the API. It is also free to run in your browser on this page.