01
Use the disclosed flat-mailer rule
Add product thickness plus 1.5 inches to packed width, and thickness plus 3.5 inches to packed length.
CalculatorsFREE · NO SIGNUP
Poly Mailer Size Calculator
Estimate a flat poly mailer's minimum outside dimensions from the product as packed, then round up and test the real fit before buying in bulk.
FREE TO USEA LOOK ATLAS TOOL
01 USE IT NOW02 NO ACCOUNT03 FIELD NOTES BELOW
WORKING INPUTS
Measure the product as it will be packed.
LIVE RESULT
Minimum poly mailer size
10.50 × 14.50 inWidth × usable length, rounded upward. Test the packed product before bulk ordering.RAW MINIMUM WIDTH10.50 in
RAW MINIMUM LENGTH14.50 in
ROUND-UP INCREMENT0.50 in
BAG TYPEFlat poly mailer
15
ONE CLEAR OPERATING SIGNAL
Use the disclosed flat-mailer rule
Measure the folded product as packed, add thickness to both directions, then add the supplier's width and usable-length allowances.
WORKING VIEW
10.5 × 14.5 IN10 × 8 × 1 IN PRODUCT
METHODUline rule: width + thickness + 1.5 in; length + thickness + 3.5 in
WORKING NOTEMinimum width × usable length under the disclosed Uline rule
INPUTS → CLEAR OUTPUT
THE FIELD NOTES
Quick answer above. Better decisions below.
Use the result now, then read the practical notes for assumptions, examples, limitations, and the choices behind it.
10 × 8 × 1 IN PRODUCT10.5 × 14.5 IN
Minimum width × usable length under the disclosed Uline rule
02
Separate usable length from the flap
Supplier outside dimensions may exclude or describe the sealing flap separately.
03
Round up for purchasing
Each minimum dimension rounds upward to the selected increment; it never rounds down.
04
Test the packed product
Fabric compression, seams, gussets, closures, tolerances, and irregular shapes can change real fit.
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Use the disclosed flat-mailer rule
Add product thickness plus 1.5 inches to packed width, and thickness plus 3.5 inches to packed length.
The rule comes from Uline's mailer sizing guide and applies to flat poly mailers, not padded bubble mailers.
Separate usable length from the flap
Supplier outside dimensions may exclude or describe the sealing flap separately.
Compare the calculated usable length with the exact stocked product specification.
Round up for purchasing
Each minimum dimension rounds upward to the selected increment; it never rounds down.
Choose a stocked size that meets or exceeds both minimum dimensions.
Test the packed product
Fabric compression, seams, gussets, closures, tolerances, and irregular shapes can change real fit.
Test the actual packed product before buying in bulk; this calculator does not guarantee fit.
Questions, answered.
How do I calculate what size poly mailer I need?
Measure the product as packed. Under the Uline rule, add thickness plus 1.5 inches to product width and thickness plus 3.5 inches to product length.
Does the mailer length include the flap?
Not always. Supplier outside dimensions may exclude the sealing flap, so compare the calculated usable length with the exact product specification.
Does the calculator guarantee the item will fit?
No. Flexible goods, gussets, seams, closures, and manufacturing tolerances affect fit. Test the actual packed product before bulk ordering.
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