- Maths reviewed by Josh Miller
- Tested by Diana Westfield
A home side rated 89.50 beats a visitor rated 84.20 by six points. The CasinoCalcs rugby ranking calculator above says the home side gains 0.17 points and the visitors lose 0.17. Barely a ripple, because the home team was expected to win. Flip the result and the away side would gain 1.83. Upsets are where the rankings move.
Rugby ranking calculator: how the points exchange works
World Rugby uses a points exchange. Nothing is created: whatever the winner gains, the loser drops. The steps:
- Add 3 to the home side’s rating for home advantage (skip this at a neutral venue).
- Take the gap between the two ratings and cap it at 10 either way.
- A home win moves 1 − gap ÷ 10 points. An away win moves 1 + gap ÷ 10. A draw moves gap ÷ 10 towards the lower-rated side.
- Multiply by 1.5 for a win by more than 15 points, and by 2 at a World Cup.
Example: 89.50 + 3 − 84.20 = 8.30 Home win by 6: 1 − 0.83 = 0.17 points
What the numbers tell you
The cap at 10 is the bit people miss. If the stronger side is rated 10 or more points better after home advantage, beating that opponent earns nothing at all, even by 50. It can only lose. That’s why a tier-one side’s ranking can drift during a long run of wins over smaller nations.
The big-win bonus is flat. Winning by 16 earns the same as winning by 60, so there’s no ranking reason to run up a cricket score. And a World Cup doubles everything, which is why rankings can lurch during a tournament.
Ratings are a decent first guess at a match, but they are not odds. To see how rating gaps turn into win chances in other sports, the Elo calculator shows the same idea with a probability attached.