@packrift/box-size-reference

Small dependency-free reference helpers for corrugated box sizing. The package is meant for product pages, internal fulfillment tools, lightweight calculators, and agent workflows that need consistent box-size math without pulling in a large shipping library.

It covers practical box sizing tasks:

• normalize length x width x height dimensions in inches or centimeters
• parse common size labels like 12 x 9 x 6 in
• calculate cubic volume
• calculate parcel length, girth, and length plus girth
• test whether a product fits in a corrugated box with clearance
• recommend fitting box sizes sorted by lowest unused volume
• estimate outside dimensions from inside dimensions and board thickness

Related Packrift resources:

• Box size calculator
• Corrugated boxes guide

Install

npm install @packrift/box-size-reference

Usage

import {
  fitsProduct,
  parcelMeasurements,
  parseBoxSize,
  recommendBoxSizes,
  volume
} from "@packrift/box-size-reference";

const box = parseBoxSize("12 x 9 x 6 in");

console.log(volume(box));
// { value: 648, unit: "in3" }

console.log(parcelMeasurements(box));
// { length: 12, width: 9, height: 6, girth: 30, lengthPlusGirth: 42, unit: "in" }

const product = { length: 10, width: 5, height: 2 };

console.log(fitsProduct(product, box, { clearance: 0.5 }));
// true

const recommendations = recommendBoxSizes(
  product,
  [
    { id: "10x6x4", length: 10, width: 6, height: 4 },
    { id: "12x9x6", length: 12, width: 9, height: 6 },
    { id: "14x10x8", length: 14, width: 10, height: 8 }
  ],
  { clearance: 0.5 }
);

console.log(recommendations.map((box) => box.id));
// ["12x9x6", "14x10x8"]

API

normalizeDimensions(dimensions, options)

Returns { length, width, height, unit } with positive numeric dimensions. Supported units are in and cm.

Options:

• fromUnit: source unit when dimensions.unit is not present
• toUnit: target unit

parseBoxSize(label, options)

Parses labels such as 12 x 9 x 6 in, 12X9X6, or 30*20*10 cm.

Options:

• defaultUnit: unit to use when the label omits one, default in
• toUnit: target unit

formatBoxSize(dimensions, options)

Returns a readable L x W x H unit label. precision defaults to 2.

volume(dimensions, options)

Returns cubic volume with a unit label such as { value: 648, unit: "in3" }.

parcelMeasurements(dimensions, options)

Sorts dimensions by parcel convention and returns the longest side as length, plus girth and lengthPlusGirth.

fitsProduct(product, box, options)

Returns true when the product can fit in the box after adding clearance to every side. The fit check is rotation-aware.

Options:

• clearance: empty space to add on each side, default 0
• unit: unit used for comparison, default inferred from the inputs

recommendBoxSizes(product, boxes, options)

Filters to fitting boxes, then sorts by lowest unused volume. Each result includes id, normalized dimensions, volume, voidVolume, and voidPercent.

estimateOutsideDimensions(insideDimensions, options)

Adds board thickness to all sides. Defaults to 0.125 in board thickness, which is a rough single-wall reference. Use boardThicknessUnit when passing a caliper in centimeters.

Notes

Corrugated boxes are commonly sold by inside dimensions in length x width x height order. Carrier rating systems often care about outside dimensions, dimensional weight, and length-plus-girth limits. This package is a reference helper for size math; it does not replace carrier rules, packaging engineering review, or product-specific crush and stacking tests.

Development

npm test

Guides

• Corrugated size-selection playbook

License

MIT