Planning a shipment starts with knowing exactly how many cartons fit inside your container before the carrier books the slot. Exporters consolidating mixed orders, freight forwarders checking available space, and warehouse teams building load plans all lean on that count.
Hit Calculate Container and the results show Max. packets, Container utilization, Container max. volume, and Volume of 1 packet. Two input modes cover both directions: enter a known carton quantity to check the space required, or ask the tool for the maximum cartons that fit.
How the packing math works
The engine compares the carton dimensions against the container inner dimensions, testing rotations to seat each layer snugly. Cartons fill the floor first, then layers stack until the inner height runs out, and declared weight limits cap the load so volume fit never turns into an overload.
Example: a 20 foot container with about 589 x 235 x 239 cm inside takes cartons of 50 x 40 x 30 cm. Each layer fits 11 along the length and 5 across, so 55 per layer, and 239 cm of height allows 7 layers, or 385 cartons using roughly 23.1 of 33.2 cubic meters, about 70 percent utilization.
Using the inputs and steering clear of errors
Always measure carton outside dimensions rather than product dimensions, and take the container inner dimensions from your carrier’s specification sheet instead of guessing the nominal size. Decide up front whether you are loading a fixed carton count or hunting for the maximum.
Watch the weight limits, because dense cargo such as canned goods hits the payload cap long before the volume fills. Reserve a small buffer for dunnage and door clearance, and remember that uneven floors and hand stacking usually shave a few centimeters off the theoretical fit.
Frequently Asked Questions
How many cartons fit in a 20ft container?
A 20 foot container offers about 33 cubic meters of usable space, roughly 590 by 235 by 239 centimeters inside. A 60 by 40 by 40 centimeter carton fills about 0.096 cubic meters, so around 330 cartons fit in practice.
Does the calculator respect container weight limits?
Yes, supply the cargo weight and the payload cap is enforced alongside the volume fit. A carton weighing 25 kilograms limits a 28,000 kilogram payload to 1,120 cartons no matter the space available.
What does container utilization percentage mean?
It compares the volume your cartons occupy with the container’s maximum volume. Loading cartons totaling 23 cubic meters into a 33 cubic meter container shows about 70 percent utilization, leaving room for air gaps and dunnage.
Why do my actual loaded cartons fall short?
Real loading loses space to voids, uneven stacking, and door clearance. A theoretical 385 carton plan often becomes 370 on the floor, a 4 percent loss that careful orientation planning can claw back.
Should cartons be rotated when loading?
Often yes, because aligning the longest side along the container length usually gains a row. Rotating a 60 by 40 centimeter carton on a 235 centimeter wide floor raises a row from 3 cartons to 5, so layers gain 10 or more boxes.