When i switched to valorant over from csgo i didnt know how to get my sensitivity from csgo so i started experimenting,
so you need to multiply your csgo sensitivity by "0.3139393939393939" and then rounded up/down
For example:
1.65 - csgo sens
1.65 x 0.3139393939393939 = 0.5179999999999999 (rounded up to 0.518)
Hope this helped you getting your csgo sens in valorant.