Kamiquasi on PRT-10968 - NCP1402-5V Step-Up Breakout

It is 12.7mm (0.5") by 16.51mm (0.65").
The height is a bit more difficult – the tallest component is the inductor, but I don’t know which one that is to check a datasheet on, but since the package outline on the board is about 6mm on the long side and the photo is fairly orthographic, after some pixel measuring I’d say it’s under 2.5mm tall. Add to that the PCB’s thickness itself, do some arbitrary upward rounding, and assume that’s 4mm maximum.