ROUND BOX · TOOLS
Convert between inches, cm, and mm, and find the right tube size for your paper.
A free length conversion tool that helps you choose the right poster tube length for your paper size. Supports multiple units and is available in both Thai and English.
Convert length units
Enter a value in any field, and the other units will be converted automatically.
Pick your paper size
Recommends the minimum tube length, rounded up to the nearest 5 cm stock size.
Easily convert between inches, centimeters, and millimeters.
1 inch equals 2.54 centimeters or 25.4 millimeters. The tool above instantly converts length measurements between inches, centimeters, millimeters, meters, and feet. It is ideal for measuring paper and poster sizes and choosing the right size of cylindrical packaging.
Choose the Right Poster Tube for A0–A5 Paper Sizes
Simply select the paper size you want to roll, and the system will recommend the minimum suitable poster tube length. For example, A1 paper requires a tube at least 65 cm long. The recommendation is calculated based on rolling the paper along its shorter side, with extra space allowed for the end caps.
About Round Box Packaging
Round Box Packaging is a full-service manufacturer of cylindrical packaging with over 35 years of experience. We specialize in poster tubes, paper cores, round boxes, and custom laser-engraved wooden lids. Custom sizes are available to meet your specific requirements. Located in Thung Khru, Bangkok, we offer nationwide delivery across Thailand. Free consultation available.
