Love, 15, 30, 40: How Tennis Scoring Actually Works

Almost everyone remembers their first brush with a tennis scoreboard. The rallies look serious, and then the umpire announces something like “fifteen love” and it suddenly sounds like a code nobody handed you the key to. Why does the score jump in fifteens? Why does it stop at 40 rather than 45? And why on earth is zero called “love”?

The good news is that tennis scoring is far simpler to use than it is to explain. Here is how it all fits together, plus the tangled history behind the numbers.

How does tennis scoring work? The quick version

A tennis match is built in four layers, stacked one inside the other: points make games, games make sets, and sets make the match. Get those four words in the right order and the rest is detail.

Within a single game, the score for each player climbs through four steps: from zero (love) to 15, then 30, then 40, and finally to game. Win a point at 40 (with a small catch we will come to) and the game is yours. The server’s score is always called first, so “30 love” means the server has two points and the returner none.

To win a set you generally need to win six games, and you must be at least two games clear. So 6–4 wins a set, but 6–5 does not; you would play on to 7–5, or into a tie-break at 6–6. Finally, the match itself is decided by sets: most matches are best of three, meaning the first player to two sets wins, while the men’s singles at the four Grand Slams is played over a marathon best of five.

Why is tennis scored 15, 30, 40?

This is the question that trips up almost every newcomer, and the honest answer is that nobody knows for certain. What we do know is that the sequence is genuinely old. Records of a 15, 30, 45 progression exist from the early 1400s, and a poem written after the Battle of Agincourt in 1415 refers to a scoring game between King Henry V and the French Dauphin. By the 1520s the “45” had been shortened to the “40” we use today, though even that tidy-up has no agreed explanation.

The most popular theory ties the numbers to a clock face. The idea is that a clock’s quarters, at 15, 30 and 45 minutes, were used to mark progress through a game, with the final point moving the hand round to the hour. It is a lovely image, and it is repeated everywhere, but historians are sceptical: minute hands did not appear on clocks until the late 1500s, well after the scoring was already in use, which rather undermines the whole story.

So treat the clock as an appealing legend rather than proven fact: the scoring almost certainly came first, and the neat explanation was fitted on afterwards. As tennis historian Elizabeth Wilson has put it, nobody really knows how it started.

What does “love” mean in tennis?

“Love” simply means zero. If you are “up 40 love” you are three points to nil in that game, and a “love game” is one won without dropping a single point. Where the word came from is, once again, disputed, with three theories doing the rounds.

The most repeated is the French egg theory: that “love” is a corruption of l’oeuf, French for egg, because an egg looks like a zero. It is charming, but there is no real evidence the French ever used the term for a tennis score. A second theory points to the Dutch or Flemish word lof, meaning honour, fitting the idea of playing hard for pride. The third, and perhaps the most down-to-earth, traces it to old English expressions such as “neither for love nor money”, where doing something “for love” meant doing it for nothing. A player on “love” had, quite literally, nothing to show.

Whichever you prefer, the takeaway is the same on court: love is nil, and hearing it called never means anything romantic.

Deuce, advantage and the small catch

Here is the wrinkle promised earlier. To win a game you cannot simply nick the point at 40; you have to win by two clear points. When both players reach 40, the score is called deuce, and from there one player must win two points in a row to take the game.

Win the first point after deuce and you have the advantage. Win the next as well and the game is yours; lose it and the score slides back to deuce. A single game can swing through deuce many times, which is what makes the closing points of a tight game so tense.

“Deuce” itself is a clearer borrowing than most tennis terms: it comes from the French deux, for two, reflecting the two points still needed to settle the game. Quite when English tennis adopted it is, in keeping with everything else here, not entirely certain.

Tie-breaks: the modern tidy-up

For most of tennis history a set with no tie-break could run on forever, and occasionally did, to famously absurd lengths. The tie-break, introduced widely from the 1970s, put a ceiling on things. When a set reaches 6–6, players contest a first-to-seven mini-game (again, you must win by two), and whoever gets there takes the set 7–6.

The tie-break has its own quirk worth knowing: here the points are counted in plain numbers, one, two, three, not the usual 15, 30, 40. It is the one moment in a match when the scoring suddenly behaves like every other sport, which is oddly reassuring.

One thing scoring is not: ranking points

It is easy to mix up two very different kinds of “points” in tennis. Everything above is about scoring a match. Entirely separate are the ranking points a player earns for how far they go in a tournament. If that side of the sport interests you, we have a full guide to the ranking points that decide the world number one, which works quite differently from the love-15-30-40 you shout across the net on a Sunday.

Now you will never lose the thread

Tennis scoring looks eccentric because it is genuinely ancient, stitched together over six centuries and carrying its history in every “fifteen love”. But the logic is tidy: four points win a game, six games win a set, and a couple of sets win the match, with deuce and the tie-break there to make sure nobody scrapes home on a fluke.

The fastest way to make it stick is to keep score yourself. Rope in a friend, grab a fresh tube of balls and call the score out loud as you play. By the end of one set the fifteens and the love will feel natural, and the next time you watch a Grand Slam you will be a step ahead of the scoreboard rather than chasing it.