Batting Average Calculator

Enter at-bats, hits and the hit breakdown to get four standard batting rates at once: average, on-base percentage, slugging percentage and OPS, with a quick rating for the average.

Four Rates From One Set of Counts

The page takes a box-score line and turns it into the four figures most often quoted for a hitter. It is careful about which counts belong in which denominator, which is where most hand calculations go wrong.

• Batting average is hits divided by at-bats. Walks and hit-by-pitch are excluded from both, which is why a patient hitter's average can look lower than their on-base rate.
• On-base percentage puts hits, walks and hit-by-pitch over at-bats plus those same three plus sacrifice flies. It measures how often a plate appearance ends with the hitter on base.
• Slugging percentage weights each hit by its value: a single counts one, a double two, a triple three and a home run four. That total, called total bases, is divided by at-bats.
• OPS is on-base plus slugging. The page adds the two already-rounded figures together, so the result can differ by a thousandth from adding the unrounded values first.
• The average is also rated against a set of bands: 300 or better is Elite, 280 Very good, 250 Average, and below that Below average.

Entering a Line

1. Enter at-bats and hits first. Hits cannot exceed at-bats, and the page will refuse the calculation if they do.
2. Break the hits down into singles, doubles, triples and home runs. These feed the slugging calculation through total bases.
3. Add walks, hit-by-pitch and sacrifice flies, which are needed for the on-base percentage.
4. Press Calculate Stats, or press Enter in any field, to produce the four rates and the rating.
5. Watch for the note under the results: if the breakdown of singles, doubles, triples and home runs does not add up to the hits you entered, the page will say so rather than silently choosing one.

A Default Line and a Mismatched One

The first block below is the page's output for its default inputs; the second shows what happens when the hit breakdown disagrees with the hit total.

• Default line of 500 at-bats, 150 hits, 100 singles, 30 doubles, 5 triples, 15 home runs, 50 walks, 5 hit-by-pitch and 5 sacrifice flies gives total bases of 235.
• The rates are AVG 0.300, OBP 0.366, SLG 0.470 and OPS 0.836, and the average is rated Elite because it sits exactly on the 300 boundary.
• Change only the hits field to 160 while leaving the breakdown alone, and the rates become AVG 0.320, OBP 0.384 and SLG 0.470, with OPS 0.854 and an Elite rating.
• Because 100 plus 30 plus 5 plus 15 is 150 rather than 160, the page adds a warning line stating that the breakdown and the hit total disagree and that it used the hits field for the rates.
• A second illustration of the rounding: 101 at-bats, 28 hits made up of 18 singles, 6 doubles, 1 triple and 3 home runs, plus 50 walks, 5 hit-by-pitch and 5 sacrifice flies. That gives 45 total bases, so OBP rounds to 0.516 and SLG rounds to 0.446, and the page prints OPS as 0.962, one point above the 0.961 you would get by adding the unrounded rates first.

What Each Rate Is Good For

Alternative	Notes
Batting average	Simple and familiar, but it ignores walks entirely and treats every hit as equally valuable. A hitter who walks a lot is underrated by average, while a hitter who only singles is overrated by it.
On-base percentage	Puts walks and being hit by pitches on equal footing with singles, which is why analysts tend to prefer it for describing how often a hitter avoids making an out. It still does not measure power.
Slugging percentage	Captures power by weighting extra-base hits, but it is built only from at-bats, so a hitter with many walks has fewer at-bats and can show an inflated slugging figure.
OPS	A convenient single number that deliberately adds two rates with different scales. It is quick to read and widely quoted, but because the scales differ, OPS slightly over-rewards the power component relative to on-base skill.

Stats Stay on Your Device

The rates are calculated in the page, so a player's line is not transmitted anywhere.

• All four figures come from local arithmetic on the numbers in the fields. No statistic is sent to a server.
• There is no account, no save button and no upload. The fields and the result box are the whole tool.
• Once loaded, the page continues to work offline because it needs no external data to compute a rate.
• Only the theme preference is persisted, and only in your browser's own storage.
• Reloading resets the line to its defaults, so copy a result you want to keep before closing the page.

Batting Statistics Questions

Why can OPS be off by a thousandth?

Because the page rounds on-base percentage and slugging to three decimal places first, then adds those rounded strings together and rounds again. Adding the exact values first and rounding once can give a different final digit. The difference is tiny and never more than a point, but it explains why a hand-calculated OPS might not match the page exactly.

What does the warning under the results mean?

It means the singles, doubles, triples and home runs you entered do not sum to the hits total. Batting average and on-base use the hits field, while slugging uses the total bases from the breakdown, so the two can rest on slightly different assumptions. The note exists so you notice the inconsistency instead of trusting a mixed-up line.

How are walks handled in each rate?

Walks are excluded from batting average and from slugging, since neither uses them. They are included in on-base percentage, both in the numerator and the denominator, because a walk is a plate appearance that ends with the hitter on base. This is why a high-walk hitter's on-base rate can sit well above their average.

Why is a home run worth four in slugging?

Slugging counts total bases, and a home run lets the hitter touch all four bases before scoring. Singles count one base, doubles two and triples three. Adding those values across all hits gives total bases, which is then divided by at-bats to produce the slugging figure.

Last verified: October 3, 2026

Launch Batting Average Calculator

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Maintained by Huang Bin · Last updated October 3, 2026