Understanding Batting Average: What It Means and Why It's Cricket's Key Metric
The batting average explained — the formula (runs divided by dismissals, not innings), why not-out innings increase the average without increasing the denominator, how average compares across formats, the best career averages in Test history, what constitutes a 'good' batting average at different levels, and the criticisms of batting average as a complete measure of batting quality.
The Formula and Its Quirk
Batting average is calculated as: total runs scored divided by number of times dismissed (not total innings played). This distinction is significant: a batsman who plays 10 innings, scores 500 runs total, and is dismissed 8 times (with 2 not-out innings) has an average of 500/8 = 62.5 — not 500/10 = 50. The not-out innings contribute to the numerator (total runs) but not the denominator (dismissals), increasing the average relative to a simple runs-per-innings calculation. This is intentional — the reasoning is that an innings cut short by a declaration or an unexpected end of match should not penalise a batsman who was still batting successfully.
The not-out quirk has a significant impact for tail-end batsmen (who are frequently not-out when the innings ends) and in limited-overs cricket (where the innings ends after a fixed number of overs, leaving batting team players not-out far more frequently than in Tests). This is why batting averages in T20 cricket are frequently inflated for lower-order batsmen who have many not-out innings against their names — their actual contribution per innings may be modest, but the averaging formula counts only their dismissals.
Historical Benchmarks
Don Bradman's Test batting average of 99.94 is the most famous statistic in cricket — so far ahead of any other player in history that it is used as the standard reference point for statistical dominance in any sport. The next highest career Test averages are approximately 60 (Graeme Pollock, Adam Voges, George Headley, Herbert Sutcliffe, Everton Weekes — all between 58-66). Most elite Test cricketers who played long careers have averages between 45 and 55; an average above 40 across 20+ innings is considered very good at international level; above 50 is exceptional. Below 30 is generally considered inadequate for a specialist batsman at the highest level, though the historical standard varies by era and position.
Format Differences
Batting averages differ significantly by format: Test cricket averages (higher, because batsmen can build long innings without time pressure, and the best players bat most frequently) average around 28-32 across all Test players. ODI averages are slightly lower (greater time pressure, more aggressive bowling options across the innings); T20I averages are significantly lower (30-35 overs are never accumulated, and high scores are rare). A Test average of 45 is an elite benchmark; an ODI average of 40 is excellent; a T20I average of 30 is good. Comparing averages across formats without considering these structural differences is misleading.
Frequently asked questions
What is a 'career best' vs 'career average' and which matters more?
Career best refers to the highest individual score (innings total) a batsman has made; career average is the mean runs per dismissal across all innings. Career average is generally considered the more informative measure of sustained quality — a batsman with a career best of 200 and a career average of 28 is a less reliable run-scorer than one with a career best of 140 and an average of 52. A high career best that significantly exceeds the career average suggests an inconsistent batsman who makes occasional large scores but fails regularly — a pattern that is often characteristic of lower-order batsmen or 'boom or bust' top-order players. Career best is tracked as a record statistic but is rarely used to assess batting quality.
How does a not-out innings affect the average practically?
A not-out innings increases the average if the not-out score is above the existing average, and has no effect if the not-out score is zero (as the 0 adds to numerator and the no-dismissal adds nothing to denominator — net effect zero). For example: a batsman averaging 40.00 after 20 dismissals scores 80 not out. New average: (800 + 80) / 20 = 880/20 = 44.0. The 80 runs increased the average by 4 points without adding a dismissal. This effect is more pronounced for tail-end batsmen who regularly score 20-30 not outs — those scores accumulate in the numerator without the denominator ever being divided into them, producing inflated averages relative to their actual batting quality.
Is a batting average of 50+ in Tests achievable for any talented player?
No — a 50+ career Test average is extremely rare and represents elite, sustained excellence over many innings against world-class international bowling. In the history of Test cricket (over 2,600 players across 140+ years of Tests), fewer than 30 players have sustained a 50+ average over 20 or more innings at the highest level. The combination required — sustained technique against varied bowling conditions, consistency over 50+ innings, performance in all countries and conditions — filters out all but the exceptional. Talented players regularly reach the 40-49 range; only generational talents sustain 50+.