In the game you find the setting under Settings → Mouse & Keyboard → Aiming → Mouse Sensitivity.
Applies to Modern Warfare (2019 and later), Warzone and Black Ops 6. Menu names can differ between titles.
Conversion
CS2 to Call of Duty Sensitivity
In short: CS2 sens times 3.3333. 1.2 becomes 4. For your own value, just edit the sentence below.
How to set it in Call of Duty
What changes when you go from CS2 to Call of Duty
CS2 turns 3.33 times further per mouse count than Call of Duty. That is why the number gets bigger while your mouse distance stays the same.
Call of Duty shows 26.3° less field of view than CS2 by default (80° against 106.26°). The picture looks a little tighter and movement on screen a little faster.
In Call of Duty you can enter up to 2 decimal places. Use all of them to keep the conversion exact.
Common questions
How do I convert CS2 sens to Call of Duty?
Multiply your CS2 sens by 3.3333. 1.2 in CS2 becomes 4 in Call of Duty.
Where do I set the sens in Call of Duty?
Settings → Mouse & Keyboard → Aiming → Mouse Sensitivity. Applies to Modern Warfare (2019 and later), Warzone and Black Ops 6. Menu names can differ between titles.
Why does Call of Duty still feel a bit different?
CS2: 90° at 4:3, about 106° at 16:9. Call of Duty: Slider from 60 to 120 (horizontal, default 80). 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.