Batting average calculator
Three hits in ten at-bats is a .300 batting average, written to three decimals exactly as box scores and leaderboards print it. Enter hits and at-bats for a game, a season or a career; walks and sacrifices stay out. Free in your browser.
- Free
- Runs in your browser
- No sign-up
- Your data stays on your device
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Worked example
- Hits
- 3
- At bats
- 10
- Batting average
- 0.3
- Batting average text
- 0.300
- Batting average display
- .300
A baseball batting average is the share of official at-bats that produced a hit, reported to three decimal places in every box score, leaderboard, and baseball card. Coaches, scorekeepers, fantasy managers, and students need that ratio from two counting stats: hits and at-bats. This batting average calculator divides hits by at-bats and rounds the quotient to three decimals, matching the published convention that writes three-for-ten as .300 rather than as thirty percent. An at-bat total of zero is rejected because the average would divide by zero. Hits that exceed at-bats are rejected because official scoring cannot produce that pair.
What batting average measures and why at-bats are the denominator
Batting average answers a hitting question that raw hit totals cannot: of the official at-bats a batter took, what fraction became hits? Official baseball scoring packs that idea into one identity: batting average equals hits divided by at-bats. The result is not written as a percent.
Scoreboards, newspapers, and baseball-reference tables print it to three decimal places, dropping a leading zero so that three hits in ten at-bats appear as .300 and a perfect day appears as 1.000. An at-bat is a plate appearance that ended in a hit, an out, or a fielder's choice; walks, hit-by-pitch, sacrifice bunts, sacrifice flies, and catcher's interference are not at-bats, so they do not enter this ratio.
That is why a patient hitter can post a modest batting average and still reach base often: this calculator does not compute on-base percentage, slugging, OPS, or wOBA. It applies only the published hits-over-at-bats identity to the two numbers you already have. Zero hits with a positive at-bat count is a legal .000, not missing data.
A batter who went four-for-four is a legal 1.000. A season or a career with tens of thousands of at-bats uses the same identity as a single game.
Where a batting average calculator earns its keep
Youth coaches and high-school scorekeepers need a reproducible batting average so a lineup card, a tournament recap, and a parent spreadsheet never disagree on whether four-for-twelve is .333. A publisher ranking for batting average calculator is targeting people who already have a hit count and an at-bat count and want the three-decimal average, not a projection system, not a Statcast spray chart, and not an on-base-plus-slugging explainer.
Fantasy managers who sit in a weekly waiver review need the same number the official box printed, so they can compare two hitters whose raw hit totals look similar but whose at-bat volume is not. Classroom and coaching-certification courses that teach counting stats need an oracle that rejects zero at-bats and still returns .000 when a batter went hitless, because those two cases are how students confuse no average yet with an average of zero.
Engineers writing scorebook and recap tests pin known-good pairs—three over ten, one over three rounded to .333, and a zero-at-bat rejection—so a reporting library cannot silently treat batting average as hits over plate appearances. Failed validation does not consume balance.
What you can do with it
Box scores and recap pages
Enter official hits and at-bats to publish a three-decimal batting average that matches the box score, whether the line is a single game, a series, or a season.
Fantasy and waiver comparisons
Convert two hit totals that look similar into batting averages against each hitter's at-bat volume so playing-time differences are visible.
FAQ
How do I calculate baseball batting average?
Batting average equals hits divided by at-bats, rounded to three decimal places. Example: 3 / 10 = 0.300, shown as .300 on a scoreboard.
What happens if at-bats is zero?
Batting average divides by at-bats, so a zero denominator is rejected and is not billed.
What if hits exceed at-bats?
Official scoring cannot produce more hits than at-bats, so that pair is rejected rather than returning an average above 1.000 from impossible counts.
Why three decimal places instead of a percent?
Baseball writes batting average to three decimals (.300, .333, 1.000), not as 30 percent. The calculator rounds the quotient to three decimals and also returns a three-digit text form so .300 does not display as 0.3.
Do walks and sacrifice flies count as at-bats?
No. Walks, hit-by-pitch, sacrifice bunts, sacrifice flies and catcher's interference are not at-bats, so leave them out of the count. That is why a patient hitter can reach base often and still post a modest average.
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 \
-H "Authorization: Bearer $KIT_KEY" \
-H "Content-Type: application/json" \
-d '{"hits":3,"at_bats":10}'const res = await fetch("https://api.kit.forhosting.com/sports/batting-average", {
method: "POST",
headers: {
"Authorization": `Bearer ${process.env.KIT_KEY}`,
"Content-Type": "application/json"
},
body: JSON.stringify({
"hits": 3,
"at_bats": 10
})
});
const { task_id } = await res.json();import os, requests
res = requests.post(
"https://api.kit.forhosting.com/sports/batting-average",
headers={"Authorization": f"Bearer {os.environ['KIT_KEY']}"},
json={
"hits": 3,
"at_bats": 10
},
)
task_id = res.json()["task_id"]<?php
$res = file_get_contents("https://api.kit.forhosting.com/sports/batting-average", false, stream_context_create([
"http" => [
"method" => "POST",
"header" => "Authorization: Bearer " . getenv("KIT_KEY") . "\r\nContent-Type: application/json",
"content" => '{"hits":3,"at_bats":10}',
],
]));
$task = json_decode($res, true);body := bytes.NewBufferString(`{"hits":3,"at_bats":10}`)
req, _ := http.NewRequest("POST", "https://api.kit.forhosting.com/sports/batting-average", 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": 3,
"at_bats": 10
}Example response
{
"task_id": "tsk_a1b2c3d4e5f6a1b2c3d4e5f6",
"type": "sports.batting_average",
"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_abs | 1000000 |
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
Successful calls are billed at $0.002; invalid input is not charged.
What batting average measures and why at-bats are the denominator
This endpoint does not decide which events your scorebook counted as at-bats, does not split singles from extra-base hits, and does not park-adjust the result.
Input contract, response shape, and validation
Values must stay within one million so a simulated season or a full career still fits, while pathological billions are rejected. Example: three hits and ten at-bats yield 0.300. Prefer bare integers over formatted strings; percent signs, thousands separators, and the leading-dot box-score form are not parsed as input. POST a JSON body with two required integers. hits is the count of official hits (singles, doubles, triples, and home runs) and must be a non-negative integer; aliases H, hit, and number_of_hits are accepted so a scorebook export does not need a rename step. at_bats is the count of official at-bats over the same window and must be a strictly positive integer, because batting average divides by at-bats; aliases at-bats, atbats, AB, ab, and at_bat are accepted. Each field may arrive as a JSON integer or as a numeric string that parses to an integer. Missing fields, empty strings, non-integers, negative counts, an at-bat total of zero, hits that exceed at-bats, or a value outside those limits fail with invalid_input naming the field and are not billed. On success the body echoes hits and at_bats, returns batting_average as the quotient rounded to three decimal places, batting_average_text as that same value always written with three digits after the decimal so .300 does not collapse to 0.3 in a display, batting_average_display in box-score form, and a formula string you can print next to the numbers. Pricing for a successful item is a flat $0.002.
Where a batting average calculator earns its keep
Keep requests small, pin the three-decimal batting_average_text in tests, and you get stable baseball arithmetic for widgets, recap pages, and edge workers without standing up a full stats service of your own.
Integration use cases
Coaching classes and scorebook tests
Students and QA pin three-for-ten as .300, one-for-three as .333, and zero at-bats as invalid_input, matching the textbook identity exactly.
Technical questions
What does the batting average calculator cost?
The browser tool is free. API requests use prepaid KIT balance at $0.002 per successful call; invalid input is not billed.