Only in USCF rated tournaments it will effect your online USCF rating.
Chess.com to USCF rating

What do you think my USCF rating would be?
I have never played OTB but play a lot online
Using Linear Regression, Blitz rating --> other ratings. (After 265 responses)
Blitz | Standard | Bullet | Turn-Based | USCF | FIDE |
800 | 1105 | 667 | 1355 | 944 | 1207 |
850 | 1134 | 720 | 1380 | 992 | 1240 |
900 | 1164 | 773 | 1406 | 1039 | 1273 |
950 | 1193 | 827 | 1431 | 1087 | 1306 |
1000 | 1223 | 880 | 1456 | 1134 | 1338 |
1050 | 1253 | 933 | 1482 | 1182 | 1371 |
1100 | 1282 | 987 | 1507 | 1229 | 1404 |
1150 | 1312 | 1040 | 1533 | 1277 | 1437 |
1200 | 1342 | 1094 | 1558 | 1324 | 1469 |
1250 | 1371 | 1147 | 1584 | 1372 | 1502 |
1300 | 1401 | 1200 | 1609 | 1419 | 1535 |
1350 | 1431 | 1254 | 1634 | 1467 | 1568 |
1400 | 1460 | 1307 | 1660 | 1514 | 1600 |
1450 | 1490 | 1360 | 1685 | 1562 | 1633 |
1500 | 1519 | 1414 | 1711 | 1609 | 1666 |
1550 | 1549 | 1467 | 1736 | 1657 | 1699 |
1600 | 1579 | 1521 | 1762 | 1704 | 1731 |
1650 | 1608 | 1574 | 1787 | 1752 | 1764 |
1700 | 1638 | 1627 | 1813 | 1799 | 1797 |
1750 | 1668 | 1681 | 1838 | 1847 | 1830 |
1800 | 1697 | 1734 | 1863 | 1894 | 1863 |
1850 | 1727 | 1787 | 1889 | 1942 | 1895 |
1900 | 1757 | 1841 | 1914 | 1989 | 1928 |
1950 | 1786 | 1894 | 1940 | 2037 | 1961 |
2000 | 1816 | 1948 | 1965 | 2084 | 1994 |
2050 | 1845 | 2001 | 1991 | 2132 | 2026 |
2100 | 1875 | 2054 | 2016 | 2179 | 2059 |
2150 | 1905 | 2108 | 2041 | 2227 | 2092 |
2200 | 1934 | 2161 | 2067 | 2274 | 2125 |
2250 | 1964 | 2214 | 2092 | 2322 | 2157 |
2300 | 1994 | 2268 | 2118 | 2369 | 2190 |
2350 | 2023 | 2321 | 2143 | 2417 | 2223 |

So according to that I would be around 1300 USCF??
Maybe. There might be slight differences
I would say around 1150 range.
Chess.com ratings tend to be a little exaggerated or that might just be for me

Hey I have a question. What the conversion from Chess.com to USCF. I was just wonder what my USCF rating would be if with my blitz and rapid being 1200 and 1300? Thanks!
I don't know, but you Chess.com ratings will be at most 70 - 100 points above your USCF rating. This is a rough estimate, but ratings are numbers based on your opponents and your record against them. ALWAYS KEEP THIS IN MIND (A message from my coach): "Ratings are not your actual strength. They, like everything else, always change". Some of my own wisdom: "Humans come up with units to measure things such as weight, length, pressure, value... etc. There are no actual measurements of weight, since pounds, grams, oz, and a lot of other units are being used, the weight stays the same, but is more in certain units. Rating is just a number. An important number, one you should be driven to improve, but not weighed down by it. Low rating means that you can improve, but don't need hang on to the fact that you had a completely winning position, and accidentally touched another piece.. A high rating is one you should be proud of, and not touch the wrong piece." What I'm trying to say is your rating is important but keep in mind it is not perfectly accurate...

In general almost all online ratings are higher then OTB. Blitz online is the closest to OTB but longer time controls there begins to be a bigger gap.

The most accurate conversion I can tell you is that if that you are 1200-1300 USCF, than you are about 1200-1300 in Chess.com. To prove this look at this chart: https://www.chess.com/article/view/chesscom-rating-comparisons
It says that theoretically you would be a 1250 if you were at 1372, and if you were at base 1200 you would in the 1100's. For standard(Rapid) you would be 1371 if you were 1372(or in the 1300's you would be a 1300), in bullet you would be in between the late 1000s or mid 1100, and lastly for turned base you would be a mid-1500 or a rising 1600.
However the one that is most trustable is blitz. Rapid is a little bit inflated, bullet is inflated a lot, and turned based(correspondence games) are the most inflated. I believe that for rapid a person could be inflated for 50, bullet would be harder to calculate, because speed is not great for everyone, however can be inflated by 50 as well, or deflated depending on skill,practice etc. And I feel that daily rating are inflated by at least 100 points, I wouldn't be surprise if it was 200-300 points to be honest.
In conclusion, you would be around a 1300 player on average, however if you don't count the inflations, you would be a 1230. Again I know the chart maybe old, but it is definently more accurate than anything else shown, trust me I looked, and you can trust linear regression as linear regression is used all the time for businesses and finacial and statistical reasons, so it is fairly trustable.
I don't know but for some reason ratings are weird on Chess.com, but it is, what it is.

Its because they rate every opponents starting from 8 up or down in games. For every 50 or so points in a game, you get 1 more point than your level outcome. Ex: you are rated exactly 1237. Any players rated 1212 - 1267 say, are 8 0 -8. For beating them, you get 8 points, drawing, 0, losing, -8. However, If they are outside, for every extra 25 points in either direction, you gain or lose a point respectively. If you play someone rated 1286, since they are 1 25 ahead of you, you get 1 more point than 8 0 -8. It would become 9 0 -7. Same with Lower rated players. It would become 7 0 -9. This goes on to your settings. You can change the rating of the people you want to play. Originally, when you start an account, It is 100 in both directions. Since I want to play higher rated players than my self, I changed it 50 lower as the minimum, and 150 higher as the max.

It honestly depends. For example, before coronavirus, I had a 1550 rapid, 1450 blitz, but 1700 USCF. On the contrary, many people online tend to have lower otb ratings because people in tournament play are more strategic, blunder less, and have better opening preparations. The only "real" way is to actually play both online and otb, but the NM smarterchess data is a pretty decent estimate.

Yeah, both @PILOTOXOMXD and @absorbingentrance
are correct, but to add on I that it depends on your Gliko rating(activity or how much you play) and that OBT and Online playing has to be simutaneous to see a difference as there is truly no way to see what rating you are from online to OBT unless you play OBT and have the same type of games in online, and at the same time keeping your rating in a stable way, constantly pacing yourself. Moreover some people are just not as good online as they are as OBT, so don't automatically think that just because you have a lower rating in the site, means that rating is your rating in OBT or vice versa. This is why I said in theory because it can be difficult sometimes to calculate someones strength, especially someone that is not consistent or play's every now and then. But regardless did you find this helpful?
[edited to fix formatting issue -- MS]

Let me rewrite this for you:
are correct, but to add on I that it depends on your Gliko rating(activity or how much you play) and that OBT and Online playing has to be simutaneous to see a difference as there is truly no way to see what rating you are from online to OBT unless you play OBT and have the same type of games in online, and at the same time keeping your rating in a stable way, constantly pacing yourself. Moreover some people are just not as good online as they are as OBT, so don't automatically think that just because you have a lower rating in the site, means that rating is your rating in OBT or vice versa. This is why I said in theory because it can be difficult sometimes to calculate someones strength, especially someone that is not consistent or play's every now and then. But regardless did you find this helpful?
Hey I have a question. What the conversion from Chess.com to USCF. I was just wonder what my USCF rating would be if with my blitz and rapid being 1200 and 1300? Thanks!