Digit Span: Average Scores and How Age Affects Them

A list of digits is read or shown at a steady pace, and you repeat it back. Lists get longer until you can no longer recall them reliably. Your span is the longest list you can repeat correctly. In the forward version you repeat the digits in order; in the backward version you reverse them, which adds a manipulation demand and draws more heavily on working memory.

Classic research (Miller, 1956) described short-term capacity as roughly seven items, plus or minus two. Later work suggests the underlying capacity is smaller—around four meaningful chunks (Cowan, 2001)—with grouping and rehearsal stretching digit lists further.

• Forward span: most healthy adults recall about 6–7 digits; 5–8 is a common range.
• Backward span: typically 1–2 digits shorter, around 4–5 digits.

Forward span is relatively stable through adulthood and declines only modestly in later life. Backward span and other tasks requiring manipulation show clearer age-related decline, reflecting changes in processing speed and attentional control. Education, sleep, fatigue, language, and test familiarity also have measurable effects.

A single online attempt is a snapshot. Distractions, device type, and practice all shift results by a digit or more. If you track your span, compare yourself against your own past results under similar conditions rather than against a single number.

The Memory Index includes a brief four-digit recall category—see the working memory guide and our methodology.

• Miller, G. A. (1956). The magical number seven, plus or minus two. Psychological Review, 63(2), 81–97.
• Cowan, N. (2001). The magical number 4 in short-term memory. Behavioral and Brain Sciences, 24(1), 87–114.
• Baddeley, A. (2012). Working memory: Theories, models, and controversies. Annual Review of Psychology, 63, 1–29.