Calculator
Neither DPI nor in-game sensitivity means anything on its own. eDPI multiplies them into one number two players can actually compare — and cm/360 states the same thing as a distance your hand travels.
The number in the game's own settings, not a percentage.
How to
How to work out your eDPI
The measurement
What eDPI does and does not tell you
800 DPI at 0.5 sensitivity and 400 DPI at 1.0 move a crosshair by exactly the same amount. Quoting either number alone tells another player nothing, which is why the community settled on the product of the two.
That makes eDPI useful for one job: comparing two players inside the same game. A 640 eDPI Counter-Strike player and an 800 eDPI Counter-Strike player are directly comparable, and the second turns 25 per cent faster for the same hand movement.
eDPI has no unit. It is a product of a hardware setting and a number whose meaning is defined by the engine, and every engine defines it differently — 0.022 degrees per count in Counter-Strike, 0.07 in Valorant, 0.0066 in Overwatch. A 960 eDPI in one is nothing like 960 in another.
Centimetres per 360 degrees has a unit and a physical meaning: how far your hand travels to turn all the way around. It is the same distance in every game, which is why it is the figure to carry between them — and why converting a sensitivity means holding it constant.
The bench
Every tool on the bench
One instrument per input, all on the same clock. A rate is only comparable against the same tool and the same interval.
Background
Read the method
Longer entries on what this tool measures and where the number comes from.
Questions
Asked of the chronometer
No. Professional players span a very wide range in the same game, and none of them are wrong. What matters is that your setting fits your desk and your grip, and that you stop changing it — consistency is what builds muscle memory, not a particular number.
Only inside the same game, and only as a starting point. Their arm length, grip, desk depth and mousepad are not yours. If you want to borrow a setup from a different game, convert their cm/360 rather than their eDPI, because that figure survives the trip.
Change the in-game sensitivity and leave DPI on a standard step such as 800 or 1600. The product is the same either way, but a standard DPI keeps every future conversion clean and means a reinstalled game or a new machine starts from a value you can reproduce.