Baseball At-Bats Per Home Run Calculator
AB/HR ratio, HR%, Isolated Power (ISO) & HR pace for baseball batters
AB/HR Ratio & Home Run Rate
Enter at-bats, home runs, and plate appearances.
Isolated Power (ISO)
Measures raw extra-base power: ISO = SLG − BA.
HR Pace Per 162 Games
Project full-season home run pace from current stats.
⚾ Baseball Power Benchmarks
AB/HR (lower = better)
- <10 — Elite power
- 10–15 — Excellent
- 15–20 — Good
- 20–30 — Average
- >30 — Below avg
HR% (higher = better)
- >4% — Elite
- 3–4% — Great
- 2–3% — Average
- <2% — Low power
ISO (higher = better)
- >.250 — Elite
- .200–.250 — Great
- .150–.200 — Average
- <.150 — Below avg
What is AB/HR in Baseball?
AB/HR (at-bats per home run) is one of baseball's simplest and most powerful measures of raw hitting power. It answers a direct question: on average, how many at-bats does this batter need before hitting a home run? A lower number means the batter is a more prolific home run hitter relative to how often they come to the plate.
The stat is used by scouts, analysts, and fantasy baseball players to compare power hitters across different eras and ballparks. It complements traditional counting stats like total home runs by normalizing for playing time.
All Formulas Explained
Note that HR% uses Plate Appearances (PA), not at-bats, because walks, hit-by-pitches, and sacrifice flies are included. PA = AB + BB + HBP + SF. Using PA gives a more accurate picture of home run frequency across all plate appearances.
Power Benchmarks Table
| Stat | Elite | Great | Average | Below Avg |
|---|---|---|---|---|
| AB/HR | <10 | 10–15 | 15–25 | >25 |
| HR% | >4% | 3–4% | 2–3% | <2% |
| ISO | >.250 | .200–.250 | .150–.200 | <.150 |
| HR Pace | 40+ | 30–40 | 20–30 | <20 |
How Home Run Rates Have Changed in MLB History
Home run rates in Major League Baseball have fluctuated dramatically across different eras. Understanding these shifts puts individual AB/HR ratios in historical context:
- Dead Ball Era (1900–1919): Home runs were extremely rare. The entire NL hit fewer home runs in some seasons than a single modern slugger hits today. AB/HR ratios of 500+ were common for regular players.
- Live Ball Era (1920–1941): After changes to the baseball itself and the banning of the spitball, Babe Ruth transformed the game. His 1927 AB/HR of 11.76 was astonishing for the time.
- Post-War Era (1946–1960s): HR rates stabilized. A 30-HR season was considered elite; 40+ put a player in a select group.
- Steroid Era (1990–2005): Home run rates soared. The single-season record was broken three times (McGwire 70 in 1998, 73 Bonds in 2001). League-wide HR/PA ratios climbed to all-time highs.
- Modern Era (2015–present): A "juiced ball" controversy and launch angle revolution drove another surge. Aaron Judge hit 62 HR in 2022, setting the AL record, with an AB/HR ratio under 9.
When comparing players across eras, it is important to consider the context. An AB/HR of 18 in 1950 was far more impressive than the same ratio today.