箱のサイズの測り方（縦・横・高さ）
箱の寸法は常に「長さ × 幅 × 高さ」の順序で表記され、開口部の最も長い辺が長さになります。
⚡箱のサイズの測り方（縦・横・高さ） Calculator
Live Interactive箱のサイズの測り方（縦・横・高さ） — Step-by-Step Reference
発送用ダンボールの正しい測り方。長さ・幅・高さの順序と宅配便サイズ区分の計算。
US Imperial Standard
Standard fractions divided into 1/16", 1/8", 1/4", and 1/2" increments with exact decimal benchmarks.
Metric SI Equivalence
Millimeter and centimeter precision calculated using exact 25.40 mm per international inch conversion.
箱のサイズの測り方（縦・横・高さ） FAQ
How do I measure a box for shipping?
Measure the outside of the box as length by width by height. Length is the longest side, width is the next, and height is the vertical side. Carriers such as UPS and FedEx round each dimension up to the next whole inch, so measure carefully.
In what order do you write box measurements?
Length x Width x Height. For a box with an open top, measure height from the bottom to the top of the closed flaps.
What is the difference between inside and outside box dimensions?
Inside dimensions are the usable space for your item, and outside dimensions include the cardboard walls and are what carriers use to calculate shipping cost.
What is dimensional (DIM) weight?
DIM weight is length x width x height divided by a carrier divisor, such as 139 for many domestic UPS and FedEx rates and 166 for some retail rates. You are billed on the greater of the actual weight and the DIM weight. Divisors change, so confirm with your carrier. The calculator above lets you change the divisor.
How do I measure a box for USPS, UPS or FedEx?
The measuring method is the same. Measure the outside length, width and height. Some services also use girth, which is length + 2 x (width + height), so check the carrier's size limits.