How to measure your hand
You need a ruler or tape measure and about a minute.
Length
Lay your hand flat, fingers together. Measure from the crease where your palm meets your wrist to the tip of your middle finger. Most adult hands are 170–200 mm.
Width
Measure straight across the widest part of your palm, over the knuckles at the base of your fingers. Leave your thumb out. Most adult hands are 80–100 mm.
No ruler? Measure from a photo
Lay your hand flat on a table with fingers together, put any bank or ID card next to it, and take a photo from directly above. Your photo stays on your device.
Which grip do you use?
Hold your mouse the way you do mid-game, then pick the closest match.
Palm
Your whole palm rests on the back of the mouse and your fingers lie flat on the buttons. Comfortable for long sessions; suits longer, fuller mice with a high back.
Claw
Your palm touches only the very back of the mouse while your fingers arch up like a claw. Good mix of control and comfort; suits medium-length mice with a rear hump.
Fingertip
Only your fingertips touch the mouse and your palm floats above it. Fast micro-adjustments; suits short, low, light mice.