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Lichess to USCF Rating Converter

#1
I have put together my own rating converter. I hope it's accurate and helps! lichess.org Rapid Rating to uschess.org Regular Rating.

| lichess rapid | uscf |
| 600 - 975 | 0 - 199 |
| 975 - 1050 | 200 - 299 |
| 1050 - 1125 | 300 - 399 |
| 1125 - 1200 | 400 - 499 |
| 1200 - 1275 | 500 - 599 |
| 1275 - 1325 | 600 - 699 |
| 1325 - 1400 | 700 - 799 |
| 1400 - 1450 | 800 - 899 |
| 1450 - 1500 | 900 - 999 |
| 1500 - 1550 | 1000 - 1099 |
| 1550 - 1575 | 1100 - 1199 |
| 1575 - 1625 | 1200 - 1299 |
| 1625 - 1675 | 1300 - 1399 |
| 1675 - 1725 | 1400 - 1499 |
| 1725 - 1800 | 1500 - 1599 |
| 1800 - 1850 | 1600 - 1699 |
| 1850 - 1925 | 1700 - 1799 |
| 1925 - 2000 | 1800 - 1899 |
| 2000 - 2075 | 1900 - 1999 |
| 2075 - 2125 | 2000 - 2099 |
| 2125 - 2200 | 2100 - 2199 |
| 2200 - 2350 | 2200 - 2299 |
| 2350+ | 2300+ |

Please, those with a USCF rating, respond to see if this is accurate.
#2
Wrong.You can't convert these ratings to each other.
#5
You can’t “convert” one rating from a rating system to another rating in another rating system with any meaningful accuracy as there are significant variables that can’t be uniformly formalized and accounted for. For example, Lichess is a much larger player pool that’s international while USCF is a much smaller one that’s regional (United States). Another variable is time control plays a role, and another is environment- online brings more casualness often than an entry fee tournament almost always taken very seriously. You also have frequency of play in both rating systems to account for. You have to play in the rating system if you want any sort of accurate rating from that system, and even then there are variables that can cause inaccuracy in that as well (another topic for another time). Ball park estimates may be as close as you can get and even then likely be inaccurate or so loose it’s not meaningful. Take mine- 1605 USCF, 2130 Rapid, 2000 Blitz, 2067 Classical on Lichess. According to the above chart I’m around 500 hundred points off the mark for my USCF rating. And every individual case may have additional variables to be accounted for not generalized above, but it’s clear that there is no way to accurately account for such rating comparisons.

-Jordan
#7
If there was some way to map lichess accounts with USCF members, and I don't think there is as being anonymous if you want to is a feature of lichess, then you could do some concrete stats.

You would have to weed out those that haven't played many lichess and UFCS games and those that haven't played recently on one or the other. (if they haven't played a USCF game in years but they are a regular on lichess, then their USCF rating might not reflect their current level)

It might be that most USCF rated players fit into a 100 point range on lichess, or it might be that there is no correlation.

I think it would have been an interesting project if it was possible.
#8
@RJblue You can't compare different ratings...
Let us have a mathematical approach: Given two unknown variables "a" and "b". Also there is given a term which involves the two variables: 2+a+6+b. Now you simplify this term: 8 + a + b. As a and b are two different (and unknown) Variables, you can't add them. As you can't add them, you also can't find a ratio between the 2 Variables, as there is no equation given. USCF and ELO are also two different Variables. The rating systems evolved SEPERATELY. It is not like Fahrenheit and Celsius or Kelvin, where you have a given formula to convert it. Here the mathematical difference: If you have an equation involving two different variables, you can find the ratio between those two. But if we speak about USCF and Lichess Glicko-2 rating, we are talking about a TERM and NOT an equation. It means that for EVERY player, the ratio between USCF and Lichess Glicko-2 rating is DIFFERENT and your ratio between lichess and USCF can be a LOT different if compared to mine. Even if lichess had an Elo rating system, still the ratings could show a significant difference. As jg777 said, the player pool and lots of other variables decide in which percentile you are in. If you play in a rating system, where millions of people play, you will obviously be in an other percentile than in a group of only 1000 players. And there are TONS of other variables that influence a rating system, so it is not possible to compare or find a ratio between two Lichess Glicko-2 rating and USCF rating. I mean: can you say that an apple ALWAYS has 1/16 of the volume of a watermelon? NO, because apples are apples, and watermelons are watermelons.
And anyway, this "converting table" was the most inaccurate one I have ever seen. "Lichess 2200 means 2200 USCF." Are you kidding? And a 2350 is a 2300 FM in USCF. LOL. Bro if you wanna "convert" (which anyways makes no sense at all) then at least think seriously.
I hope you understood the mathematical approach as well as the logical approach.

--> SC Murrhardt

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