Work out your eDPI from mouse DPI and in-game sensitivity, and find the sensitivity that keeps the same feel when you switch to a different DPI.
| Input | Result |
|---|---|
| 800 DPI × 0.35 | 280 eDPI |
| 400 DPI × 0.7 | 280 eDPI |
| 1600 DPI × 0.175 | 280 eDPI |
| 800 → 1600 DPI, keep feel (sens 0.35) | 280 eDPI · new sensitivity 0.175 |
| 800 → 400 DPI, keep feel (sens 0.35) | 280 eDPI · new sensitivity 0.7 |
| 1600 → 800 DPI, keep feel (sens 0.22) | 352 eDPI · new sensitivity 0.44 |
eDPI = mouse DPI × in-game sensitivity. It exists so that two players on different mouse DPI can compare setups on one scale: 0.35 at 800 DPI and 0.7 at 400 DPI are both 280 eDPI, and they turn at exactly the same speed. That is the entire point of the number.
The thing it is not: a cross-game scale. Because games use different yaw constants, an eDPI of 280 in Valorant and an eDPI of 280 in CS2 describe wildly different physical mouse movement, roughly 3.18× apart. Matching an eDPI label across two games is not the same as matching how your hand moves. Convert the sensitivity and keep your DPI; do not carry the eDPI number across.
Changing DPI is the case where eDPI earns its keep. Keeping the same feel means holding the product constant, so the new sensitivity is your current eDPI divided by the new DPI, halve the sensitivity when you double the DPI. The calculator does that in the second field.
One caveat on DPI itself: on many mice the printed DPI is nominal, and sensors can deviate by a percent or two from the labelled step. If a converted setting feels consistently fast or slow, this is a more likely culprit than the arithmetic.
There isn't one, it is personal. What the number is useful for is comparing two setups on the same scale: 0.35 at 800 DPI and 0.7 at 400 DPI are the same 280 eDPI and turn at the same speed.
No. eDPI is only a within-game scale, because games use different yaw constants. Convert the sensitivity instead and keep your DPI.
Not if you rescale. Hold DPI × sensitivity constant: doubling DPI means halving sensitivity. The second field on this page does that arithmetic.
Most often the mouse itself: printed DPI is nominal and sensors deviate by a percent or two. Measure your real 360° distance and tune from there.