In the game you find the setting under Settings → Keyboard/Mouse → Mouse Sensitivity.
The quicker way is the console: sensitivity 0.955
Conversion
Valorant to CS2 Sensitivity
In short: Valorant sens times 3.1818. 0.3 becomes 0.955. For your own value, just edit the sentence below.
How to set it in CS2
What changes when you go from Valorant to CS2
Valorant turns 3.18 times further per mouse count than CS2. That is why the number gets bigger while your mouse distance stays the same.
CS2 shows 3.3° more field of view than Valorant by default (106.26° against 103°). The picture looks a little wider and movement on screen a little slower.
In CS2 you can enter up to 3 decimal places. Use all of them to keep the conversion exact.
Common questions
How do I convert Valorant sens to CS2?
Multiply your Valorant sens by 3.1818. 0.3 in Valorant becomes 0.955 in CS2.
Where do I set the sens in CS2?
Settings → Keyboard/Mouse → Mouse Sensitivity. Or in the console: sensitivity 0.955.
Why does CS2 still feel a bit different?
Both games have a fixed field of view: Valorant 103° horizontal, CS2 90° at 4:3, about 106° at 16:9. With the same mouse distance, the game with the smaller field of view can feel a bit faster.
Does this also apply to scopes?
No. The values are for hipfire. Zoom and scope sensitivities are set separately in the game.
Should I change my DPI?
No. Keep your DPI and only change the sens in the game. That keeps your feel the same everywhere.