Tennis Match Odds Calculator
Points to games to sets to matches — a one-point-in-a-hundred edge becomes a ten-point edge by the time it reaches a match.
This treats every point as independent with the same chance, which is the standard simplification. Real tennis alternates serve, so a player's chance differs between their own service games and their opponent's — modelling that properly needs two numbers rather than one, and would widen these figures further. Nothing is uploaded.
Every level of the scoring hierarchy widens the edge
Points make games, games make sets, sets make matches, and each step takes whatever went in and stretches it. A player winning 55 points in every hundred climbs from there to 94.4% of best-of-five matches without ever getting better at tennis.
| Winning… | Chance |
|---|---|
| A point | 55.0% |
| A game | 62.3% |
| A set | 80.2% |
| A best-of-three match | 89.8% |
| A best-of-five match | 94.4% |
At exactly even the whole structure collapses back to a coin — every level returns 50.0%, and so does deuce. That is the check worth running before believing any other row: a model that is not even at even is measuring something other than skill.
Which means a tiny edge is not a tiny edge
Win 51 points in a hundred — an edge nobody in the stands could see — and you win 60.0% of best-of-three matches. The one-point advantage has been multiplied by 10.0 on the way up.
| Points won | Game | Set | Best of 3 | Best of 5 | Edge × |
|---|---|---|---|---|---|
| 50% | 50.0% | 50.0% | 50.0% | 50.0% | — |
| 51% | 52.5% | 56.7% | 60.0% | 62.5% | 10.0× |
| 52% | 55.0% | 63.3% | 69.5% | 73.8% | 9.7× |
| 55% | 62.3% | 80.2% | 89.8% | 94.4% | 8.0× |
| 60% | 73.6% | 95.6% | 99.4% | 99.9% | 4.9× |
| 65% | 83.0% | 99.5% | 100.0% | 100.0% | 3.3× |
Note the last column falls as the edge grows: 10.0× at a single point, 8.0× at five, 4.9× at ten. The amplification is largest exactly where the edge is smallest, because the big edges have almost nowhere left to go — 99.4% is already nearly certain, and nothing can exceed certainty.
How to use
- Enter the share of points you win.
- Set the tiebreak chance if you want something other than even.
- Read the odds at each level of the hierarchy.
- Watch how far a tiny edge travels.
Frequently asked questions
How does a small edge become a large one?
Because tennis scoring is a hierarchy. Points make games, games make sets, sets make matches, and each level takes whatever edge went in and widens it. Winning 51 points in a hundred wins 60% of best-of-three matches.
What are the odds from deuce?
The square of the point odds over the sum of both squares, because two points in a row is the only sequence that settles it and every alternating pair returns you to deuce. At even it is 50%, as it must be.
Does best-of-five favour the better player?
Yes, and measurably. It is one more level of the same amplification, so a 55% point-winner goes from about 90% of best-of-three matches to about 94% of best-of-five. Longer formats reward the favourite.
Why does the amplification fall as the edge grows?
Because the big edges run out of room. A 60% point-winner already wins over 99% of matches, and nothing can exceed certainty — so the multiplier is largest exactly where the edge is smallest.
What happens at exactly even?
Every level returns exactly 50%, including deuce. That is worth checking before believing any other figure: a model that is not even at even is measuring something other than skill.
Is this how real tennis works?
It is the standard simplification. Real tennis alternates serve, so a player has different odds serving and receiving — modelling that needs two numbers rather than one, and would widen these figures further rather than narrow them.
Why does it feel like close matches are coin flips?
Because the point-level edge that decides them is genuinely invisible. Two points in a hundred is nothing you could see from the stands, and it is worth about seven matches in ten.
Does this send anything anywhere?
No. Every figure is computed in your browser, and nothing is uploaded or stored.
🔒 This tool runs entirely in your browser. Nothing you enter is uploaded, logged, or stored.