Packaging Sizes and Box Strength

These tools help you pick or check packaging. Get box dimensions from your items, estimate compression strength and carton weight, choose single or double wall board, look up flute sizes, print fragile labels, or look up envelope, label, mailer box and poly mailer sizes.

Tools in this group

• Box Size Calculator — Enter your item or items and the clearance to get the inside and outside dimensions of the box you need.
• Cardboard Box Weight Calculator — Enter the box size (or a flat blank) and the board weight, or the liner and medium weights, to get the weight of one empty box and of a whole order.
• Corrugated Flute Sizes Chart — Look up any flute, or count the flutes on a piece of board to find out which flute size it is.
• Double Wall Corrugated: Which Wall Do You Need? — Enter the weight of the packed box to see which wall construction covers it and the minimum ECT and burst rating to ask for.
• Envelope Size Chart and Finder — Look up envelope sizes in inches and mm, or pick a paper size and fold to see which envelopes fit.
• Fragile Labels — Tick the handling marks you need, pick the paper and label size, and print a full sheet of labels or download it as SVG.
• Label Size Chart and Sheet Template — Find common sheet-label sizes, or enter your label size to see how many fit per sheet and print a template.
• Mailer Box Sizes Chart and Finder — See common mailer box dimensions, or enter your item to find the boxes that fit and how much space is left.
• McKee Formula Calculator for Box Strength — Enter the box length and width, the board caliper and ECT to get the box compression strength, or enter a target strength to get the ECT you need.
• Poly Mailer Sizes Chart and Size Finder — See common poly mailer sizes, or enter your item's size to find the smallest mailer bag that fits.