Curtain Size Calculator2026

Curtain Size Calculator Offline is a local tool for home renovation, rental makeovers, interior measuring, and curtain shops. Enter window width and height, mounting style, pleat ratio, floor clearance, and fabric width to quickly estimate finished curtain size, fabric length, rail or rod length, and a reviewable room plan. The app requires no login, does not connect to the internet, and does not collect personal data. All plans stay on your device. It is useful on-site, before shop quotes, and before ordering curtains online, helping reduce sizing mistakes, fabric shortages, and mismatched rail lengths.