In the game you find the setting under Settings → Keyboard/Mouse → Mouse Sensitivity.
The quicker way is the console: sensitivity 1.5
Conversion
Overwatch 2 to CS2 Sensitivity
In short: Overwatch 2 sens times 0.3. 5 becomes 1.5. For your own value, just edit the sentence below.
How to set it in CS2
What changes when you go from Overwatch 2 to CS2
CS2 turns 3.33 times further per mouse count than Overwatch 2. That is why the number gets smaller while your mouse distance stays the same.
CS2 shows 3.3° more field of view than Overwatch 2 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 Overwatch 2 sens to CS2?
Multiply your Overwatch 2 sens by 0.3. 5 in Overwatch 2 becomes 1.5 in CS2.
Where do I set the sens in CS2?
Settings → Keyboard/Mouse → Mouse Sensitivity. Or in the console: sensitivity 1.5.
Why does CS2 still feel a bit different?
Overwatch 2: Slider from 80° to 103°. CS2: 90° at 4:3, about 106° at 16:9. Match the field of view as closely as you can; then the converted sens feels most natural.
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.