Carton Calculator

What it solves

Working out carton sizes and units per carton by hand is slow and easy to get wrong. Get it wrong and you end up over the carrier size limit, over the weight limit, paying for volumetric weight you did not need, or with a carton that deforms in transit and fails the size check at the depot.

The calculator tries all six ways your item can sit in the carton, across every sensible stacking pattern, and applies your buffer gap, deformation allowance, side limits, girth limit and weight range. It returns the compliant plan with the lowest chargeable weight per unit, which is what your shipping cost actually keys off.

Basic inputs

Four numbers are enough for a first answer. No advanced settings needed.

Item length (cm)

Longest side of one item.

Item width (cm)

Second-longest side of one item.

Item height (cm)

Shortest side of one item.

Single unit gross weight (kg)

Weight of one item, carton not included.

Advanced settings

Open these when your forwarder or warehouse works to different limits than our defaults.

Carton buffer gap (cm)

Gap left between stacked items. Default 0.75cm. Use 0.5cm for small general goods and 1cm for fragile goods so they are not crushed against each other.

Max allowed carton weight (kg)

Heaviest a single carton may be. Default 21kg, which keeps you under the usual overweight surcharge threshold.

Minimum carton weight (kg)

Lightest a carton may ship at, so you are not paying to send near-empty cartons. Set it to 0 if your channel has no floor.

Carton deformation tolerance (cm)

Room reserved for the carton bulging or being squashed in transit. Default 2cm. It is deducted from every side limit and from the girth limit, so the carton still measures within spec when it reaches the depot.

Max longest / second / third side (cm)

Your carrier’s published side limits. The deformation tolerance comes off each one before the check runs.

Maximum girth (cm)

Your carrier’s girth limit, where girth = length + 2 × width + 2 × height.

How to use it

• Enter the length, width, height and gross weight of one item. All four must be above zero.
• Optional: open Advanced settings and match the deformation tolerance, buffer gap and size or weight limits to your forwarder’s rules. The defaults suit most channels.
• Press Calculate best carton plan.
• Read the result: units per carton, outer carton size, actual weight, volumetric weight, chargeable weight, chargeable weight per unit, item orientation and stack layout.

Reading the result

Units per carton

Most items you can pack in one carton and still meet every rule you set.

Outer carton size

Finished carton dimensions, buffer gaps included.

Total actual weight

Combined weight of all items in the carton.

Volumetric weight

Ocean LCL volumetric weight: length × width × height ÷ 6000.

Chargeable weight

The greater of actual and volumetric weight. This is what you are billed on.

Chargeable weight per unit

Chargeable weight divided by units per carton. Use this to cost a single item.

Item orientation

Which way each item sits, as length × width × height inside the carton.

Stack layout

How many items along each carton axis.

Notes

• The defaults suit Easy China Warehouse and most forwarder channels. A few channels have their own rules, so adjust the advanced settings for those.
• If nothing compliant comes back, the message tells you which limit blocked it. Usually it is the minimum carton weight on a light product, or the side limits on a bulky one.
• One item cannot weigh more than the max carton weight. If yours does, talk to us about the right channel for it.
• For help tuning the settings for your channel, email [email protected].

解决什么问题

人工测算纸箱尺寸和单箱装量既耗时又容易出错。一旦算错，就可能出现纸箱尺寸超标、重量超限、体积重偏高、不符合货代渠道规则，或纸箱在运输途中受挤压变形、到仓复核时尺寸不合格等问题。

本工具会自动匹配产品的 6 种摆放姿态，遍历各种堆叠组合，并结合装箱缓冲间隙、纸箱变形余量、三边限制、围长限制与重量上下限进行筛选，输出符合规则且单位计费重量最低的装箱方案。单位计费重量才是运费的实际计价依据。

基础输入

只需填写四项参数即可快速得到结果，无需开启高级设置。

Item length 产品长度（cm）

单个产品的最长边。

Item width 产品宽度（cm）

单个产品的次长边。

Item height 产品高度（cm）

单个产品的最短边。

Single unit gross weight 单品毛重（kg）

单个产品的实际重量，不含外箱。

高级设置

当合作货代或仓库的规则与默认值不同时，展开此区域自行调整。

Carton buffer gap 装箱缓冲间隙（cm）

产品堆叠之间预留的间隙，默认 0.75cm。小件普货可设 0.5cm，易碎品建议 1cm，防止产品相互挤压磨损。

Max allowed carton weight 纸箱最大限重（kg）

单箱最大承重，默认 21kg，可规避常见的超重附加费门槛。

Minimum carton weight 纸箱最小重量（kg）

单箱最低出货重量，避免空箱、轻箱被渠道拒收或加价。若渠道无此要求，可设为 0。

Carton deformation tolerance 纸箱变形余量（cm）

为运输途中纸箱鼓包、挤压预留的空间，默认 2cm。系统会在三边限制与围长限制中自动扣除该数值，确保货物到仓复核时尺寸仍然合规。

Max longest / second / third side 三边最大限制（cm）

物流渠道公布的三边尺寸上限，系统会先扣除变形余量再进行校验。

Maximum girth 最大围长限制（cm）

物流渠道的围长上限，围长公式为：长 + 2 × 宽 + 2 × 高。

使用步骤

• 填写单个产品的长、宽、高与单品毛重，四项均须大于 0。
• 可选：展开高级设置，按货代规则调整变形余量、缓冲间隙及尺寸、重量限制。无特殊要求时保留默认值即可。
• 点击「Calculate best carton plan」按钮。
• 查看结果：单箱数量、外箱尺寸、实际重量、体积重、计费重、单品平均计费重、摆放姿态与堆叠规格。

结果说明

Units per carton 单箱数量

在当前规则下，单箱可装载的最大合规数量。

Outer carton size 外箱尺寸

含缓冲间隙的最终外箱长宽高。

Total actual weight 总实际重量

单箱内所有产品的总重量。

Volumetric weight 体积重

海运拼箱体积重：长 × 宽 × 高 ÷ 6000。

Chargeable weight 计费重

取实际重与体积重的较大值，为最终计费依据。

Chargeable weight per unit 单品平均计费重

计费重除以单箱数量，用于核算单个产品的运输成本。

Item orientation 摆放姿态

产品在箱内的摆放方向，按长 × 宽 × 高表示。

Stack layout 堆叠规格

产品在纸箱三个方向上的堆叠数量。

注意事项

• 默认参数适配 Easy China Warehouse 及市面上绝大多数货代渠道。少数渠道规则不同，请自行调整高级设置。
• 若提示无合规方案，页面会说明是哪一项限制导致的。轻小产品通常卡在纸箱最小重量，大件产品通常卡在三边限制。
• 单品重量不可超过纸箱最大限重。若已超过，请联系我们确认合适的渠道。
• 如需针对具体渠道调试参数，可发送邮件至 [email protected]。