Ars calculates the size of the DualShock 4 touchpad: about 2.1” x 1”

A little image wrangling (and math) generates a general sizing estimate.

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math Ars Technica

Ars Technica

Game Controller Repairing Touch Pad Accessory, Wearable and Durable Replacement Touchpad for PS4 Gamepad : Video Games

DualShock 4 CHU-ZCT2U Touchpad Replacement - iFixit Repair Guide

PS4 Controller Touchpad

Description: This touch pad is made of high quality ABS, wear-resistant and durable. It has exquisite craft, comfortable and easy to use. Best

Game Controller Repairing Touch Pad Accessory, Wearable and Durable Replacement Touchpad for PS4 Gamepad : Video Games

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Vita 2000 Left Analog Stick Replacement Guide : r/vita

Artwork Print and Cut for AFS Special Custom Panel - Focus Attack

DualShock 4 (CUH-ZCT1U) Touch Pad Replacement - iFixit Repair Guide