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
Overwatch 2 to Call of Duty Sensitivity
In short: Overwatch 2 sens times 1. 5 becomes 5. For your own value, just edit the sentence below.
How to set it in Call of Duty
What changes when you go from Overwatch 2 to Call of Duty
Overwatch 2 and Call of Duty turn the same angle per mouse count. You can keep your number as it is.
Call of Duty shows 23° less field of view than Overwatch 2 by default (80° against 103°). 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 Overwatch 2 sens to Call of Duty?
Multiply your Overwatch 2 sens by 1. 5 in Overwatch 2 becomes 5 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?
Overwatch 2: Slider from 80° to 103°. 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.