Packing Optimization

Right-size your box and cut shipping costs by up to 30%. Calculate the best box for your item.

Item Length (in)

Item Width (in)

Item Height (in)

Padding Needed (in each side)

Standard USPS Free Box Sizes

Box	Dimensions	Cost
USPS Small Flat Rate Box	8.69x5.44x1.75 in	Free box, Priority rate
USPS Medium Flat Rate Box	11x8.5x5.5 in	Free box, Priority rate
USPS Large Flat Rate Box	12x12x5.5 in	Free box, Priority rate
USPS Priority Mail Padded Flat Rate Envelope	12.5x9.5 in	Free envelope