01
Calculate cubic feet before tier rounding
Multiply outside length, width, and height in inches, then divide by 1,728.
CalculatorsFREE · NO SIGNUP
USPS Cubic Pricing Calculator
Turn package dimensions into a USPS cubic-foot tier, check the basic limits, and apply the current rate you enter from the price sheet.
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01 USE IT NOW02 NO ACCOUNT03 FIELD NOTES BELOW
WORKING INPUTS
Find the cubic tier before comparing postage.
LIVE RESULT
Entered cubic postage
$8.42Entered published rate only; confirm service, zone, mailing standards, and account eligibility with USPS.CUBIC VOLUME0.3333 ft³
CUBIC PRICING TIER0.4 ft³
LONGEST DIMENSION12 in
PACKED WEIGHT8 lb
14
A TIER, NOT A LIVE QUOTE
Cubic pricing starts with the parcel
The calculator owns volume, tier rounding, and basic limits. The current service-and-zone rate still comes from the published USPS price sheet or your approved agreement.
WORKING VIEW
0.4 CUBIC TIER12 × 8 × 6 IN
METHODrounded-up 0.1 ft³ tier × the entered published rate
WORKING NOTE0.3333 ft³ rounded up by 0.1
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.
12 × 8 × 6 IN0.4 CUBIC TIER
0.3333 ft³ rounded up by 0.1
02
Check the basic cubic parcel boundaries
The worksheet checks the declared one-cubic-foot, 20-pound, and 18-inch longest-side boundaries.
03
Bring the current rate to the tier
Enter the current price for the selected USPS service and zone after the tier is known.
04
Measure the finished parcel
Use outside dimensions after sealing, including any bulge or irregularity reflected in mailing standards.
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Calculate cubic feet before tier rounding
Multiply outside length, width, and height in inches, then divide by 1,728.
Round the cubic-foot result up to the next 0.1 tier rather than to the nearest tenth.
Check the basic cubic parcel boundaries
The worksheet checks the declared one-cubic-foot, 20-pound, and 18-inch longest-side boundaries.
Packaging, service, zone, mailing standards, and account eligibility still control the actual shipment.
Bring the current rate to the tier
Enter the current price for the selected USPS service and zone after the tier is known.
The calculator never claims to fetch a live quote or account-specific discount.
Measure the finished parcel
Use outside dimensions after sealing, including any bulge or irregularity reflected in mailing standards.
A small measurement change can move the parcel into the next tenth-cubic-foot tier.
Questions, answered.
How is the USPS cubic tier calculated?
Multiply the outside dimensions in inches, divide by 1,728, and round up to the next 0.1 cubic-foot tier.
Does this show a live USPS quote?
No. It applies the current published rate you enter and does not fetch service, zone, or account pricing.
What if the parcel exceeds a cubic limit?
The calculator rejects parcels above the declared basic cubic boundaries; confirm all current eligibility rules in the USPS Domestic Mail Manual.
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