Why Tennis Is Scored 15, 30 and 40 Rather Than 1, 2 and 3

Tennis is the only major sport that counts points as 15, 30 and 40. The sequence is inherited rather than designed, and it comes from the game that preceded lawn tennis.

The jeu de paume inheritance

Lawn tennis was codified in the 1870s, but its scoring was taken from real tennis. The older indoor game known in French as jeu de paume, played in Europe for centuries beforehand. The numbering was already established there, so the question is really where the older game got it.

The clock-face explanation

The most widely repeated account is that a clock face was used to display the score, with the hand moved a quarter turn for each point: 15, 30, 45, and back to zero for game. This has the appeal of explaining the intervals neatly. Its weakness is chronological. The sequence appears in sources predating the widespread use of clock faces marked in minutes, which makes the clock a plausible later rationalisation rather than the origin.

Why 45 became 40

Under the clock account, the third point should be 45, and in older sources it sometimes is. The usual explanation for the shift to 40 is verbal economy: "forty" is a single short syllable pair where "forty-five" is three, and scores are called aloud throughout a match. A related account ties it to the need to fit advantage into the same quarter-hour scheme, with 40 leaving room to move to 50 at advantage before game at 60.

What the evidence supports

Honest answer: the origin is not settled. The sequence is demonstrably inherited from real tennis, and the shortening of 45 to 40 in spoken use is well attested. The clock-face story is the most common explanation and may well be right, but it is not documented in the way a settled etymology would be. Accounts that state it as established fact are overstating the record.

What is settled is the modern rule itself: the ITF Rules of Tennis specify the sequence and the deuce and advantage procedure, whatever its origins. The history is a curiosity; the scoring is not in doubt.

Why "love" for zero

The other oddity in the same sequence has a similar status. The most repeated explanation derives it from the French l’œuf, an egg, for the shape of a zero. The same logic as a duck in cricket. An alternative traces it to the English sense of playing for love, meaning for nothing. Both are plausible and neither is conclusively documented.

How the score is called

The server's score is always announced first, which is why the same position sounds different depending on who is serving: 30–15 and 15–30 describe the same two-point-to-one game viewed from opposite ends. Getting this the wrong way round is the most common error among new players keeping score aloud.

When both players have the same score the call is the number followed by "all", fifteen all, thirty all, with the exception of 40–40, which is deuce. At the start of a game the score is love–love, usually shortened simply to a call of the server's name or nothing at all.

Scoring in the rest of the racquet family

The oddity stands out because tennis's relatives do not share it. Table tennis counts in ordinary numbers to eleven, badminton to twenty-one, squash to eleven. All of them retain a two-point margin requirement at the end, which suggests the margin rule and the numbering are separable ideas: tennis kept an inherited numbering system and a widely-shared margin convention, and only the former looks strange.

Real tennis, the game lawn tennis took its scoring from, is still played and still uses the same sequence. Anyone wanting to see where the numbering came from can watch it in its original setting rather than reconstruct it from etymology.