Converting Sensitivity

[bIackbear]

So my DPI is 400 and I want to have in EVERY game 'same' sensitivity. So there are many methods to convert my sensitivity, but what would be the most accurate?

Method 1: 400 DPI + Viewspeed v2 -> Every 3D Games

Method 2:  400 DPI + Viewspeed v2 -> a 3D game (example CS:GO) and then converting to every game with Viewspeed v2 of CS:GO's 360* distance

Method 3:  400 DPI + Viewspeed v2 -> a 3D game (example CS:GO ) and then converting to every game with Monitor Distance 56.25% (9/16*100) of CS:GO's 360* distance

Or are there better methods than these?