Mat Board Size Calculator is an offline utility for photo framing, handmade frames, and picture mat layout planning. Enter photo size, frame size, mat board outer dimensions, and border needs to quickly get window dimensions, top, bottom, left, and right borders, cutting references, and multi-opening layout plans. The app requires no login, does not connect to the internet, and does not collect personal data. All projects are saved locally on your device, making it useful for framing shop discussions, home photo wall preparation, and checking mat board cuts before crafting.
