Kraft Mailer Box Starter Pack
The catalog locks a 10 × 10 × 4 cm assembled exterior size and packs of 25, 50 or 100. Do not compare that exterior size directly with this internal target; request confirmed usable space first.
Private browser-only planning tool
Mailer Box Size Calculator
Turn the packed product dimensions and protective clearance into a minimum internal length, width and height. Use the result to prepare a clearer small-batch quote—not as an unapproved production dieline.
Calculate an internal target
Estimate the minimum internal box target
Measure the product after applying any sleeve, wrap or primary packaging. Enter the protection thickness on each side; the tool adds it twice to the corresponding dimension.
Minimum internal target (L × W × H)
Internal volume
Total added clearance
Quote brief starter
Packed product: 20 × 14 × 5 cm. Minimum internal target after clearance: 22 × 16 × 7 cm. Please confirm the internal and external dimensions, board/flute, tolerance, insert fit, sample route, packed weight, quantity and delivered cost before production.
Use a physical fit test before approving production.
What the result does—and does not—mean
It is a minimum internal target. It combines the packed product with the entered protection allowance.
It is not an exterior box size. Board thickness, flute, folds, lid geometry and production tolerances change the outside dimensions.
Do not send the result straight to production. Confirm a physical sample or prototype, actual insert compression, orientation, movement, closure, board construction, packed weight, freight and delivery terms.
Convert the estimate into a supplier-ready brief
| Input | What to provide | Why it matters |
|---|---|---|
| Packed product | Length × width × height after primary wrap or sleeve | A bare product can understate the real space requirement. |
| Protection | Tissue, foam, corrugated insert or paper fill thickness on each side | Different materials compress differently. |
| Orientation | Which face must stay up; whether rotation is allowed | Orientation can change the needed footprint and opening experience. |
| Box construction | Mailer style, board/flute, print finish and closure | Construction determines exterior size and manufacturability. |
| Approval | Sample, fit test, tolerance and packed-drop requirements | The calculator cannot validate physical fit or transit performance. |
For the complete eight-step measurement process, use the mailer box size and insert guide.
Mailer boxes to compare
Slim Kraft Mailer Box Pack
A long, flat kraft format in packs of 20, 50 or 100. Exact size, board grade, packed weight, stock, branding and freight remain review-first before payment.
Compare the two formats in the kraft starter vs slim mailer guide.
Frequently asked questions
Should a mailer box size use internal or external dimensions?
Start with a minimum internal target based on the packed product. Board thickness, folds and construction determine the exterior size, so ask the supplier to confirm both.
How much clearance should I add around a product?
Add the real thickness of tissue, cushioning, sleeves or inserts on each side. Use a physical packing test rather than a universal allowance when fit, movement or crush risk matters.
Does the calculator include board thickness?
No. It calculates a minimum internal target only. Board grade, flute, folds and tolerances must be confirmed before converting it into an exterior size or dieline.
Are my product measurements sent to Daoyi Pack?
No. The calculator runs in the browser and does not submit or store the entered measurements.
Can this estimate be used as a production specification?
No. Confirm a physical sample, final internal and external dimensions, board construction, insert fit, tolerance, packed weight and delivery terms before production.
Measure first, then compare a real box.
Use the result as a brief starter and keep every unverified production fact subject to sample and supplier review.