Show HN: Simple CBM calculator for shipping and freight

Hi HN Just sharing a small tool I built: https://cbmcalc.com https://cbmcalc.com It calculates CBM (cubic meters) for shipping cartons, pallets, or multiple boxes. I made it because most CBM calculators online are too simple and some couldn't add multi items. This one is simple and kinda works on mobile too Would love any feedback!