In the game you find the setting under Settings → Mouse & Keyboard → Sensitivity X and Y.
Set X and Y sensitivity to the same percentage.
Conversion
Overwatch 2 to Fortnite Sensitivity
In short: Overwatch 2 sens times 1.188. 5 becomes 5.9%. For your own value, just edit the sentence below.
How to set it in Fortnite
What changes when you go from Overwatch 2 to Fortnite
Overwatch 2 turns 1.19 times further per mouse count than Fortnite. That is why the number gets bigger while your mouse distance stays the same.
Fortnite 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 Fortnite you can enter up to 1 decimal place. Use all of them to keep the conversion exact.
Common questions
How do I convert Overwatch 2 sens to Fortnite?
Multiply your Overwatch 2 sens by 1.188. 5 in Overwatch 2 becomes 5.9% in Fortnite.
Where do I set the sens in Fortnite?
Settings → Mouse & Keyboard → Sensitivity X and Y. Set X and Y sensitivity to the same percentage.
Why does Fortnite still feel a bit different?
Overwatch 2: Slider from 80° to 103°. Fortnite: Default 80°, check in the game whether you changed it. 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.