UPS thinks about boxes differently than USPS: instead of a shelf of house cartons, it sorts your packaging into cubic-inch tiers. Learn the five tiers once and you can predict how any box you own will be treated, then let a live quote settle what it costs.
Five size classes, three test cubes, all quoted on 2026-07-27 with nothing rounded.
These tiers define Simple Rate, UPS's fixed-price program for boxes under 50 lb and one cubic foot. You supply the packaging; ups.com says explicitly that no special box is required. Starting prices below are UPS's own published floors for the slowest speed.
| Tier | Volume | Example boxes | Simple Rate from |
|---|---|---|---|
| Extra small | 1-100 cu in | 4 × 4 × 4, 6 × 4 × 4, 8 × 6 × 2 | $12.20 |
| Small | 101-250 cu in | 6 × 6 × 6, 8 × 6 × 5, 12 × 9 × 2 | $15.80 |
| Medium | 251-650 cu in | 8 × 8 × 8, 12 × 9 × 6, 13 × 11 × 2 | $18.95 |
| Large | 651-1,050 cu in | 10 × 10 × 10, 12 × 12 × 7, 15 × 11 × 6 | $24.85 |
| Extra large | 1,051-1,728 cu in | 12 × 12 × 12, 16 × 12 × 9, 18 × 12 × 6 | $30.95 |
| Box | UPS Ground Saver | UPS Ground | Fastest UPS row |
|---|---|---|---|
| 4 × 4 × 4 in, 1 lb | not returned | $10.31 | 2nd Day Air $15.38 |
| 8 × 8 × 8 in, 4 lb | $11.70 | $13.23 | 2nd Day Air $21.05 |
| 12 × 12 × 12 in, 10 lb | $16.77 | $20.22 | 3 Day Select $25.59 |
Put the two tables together and a useful gap opens: on this lane, per-weight pricing through our calculator came in under the Simple Rate floor for every cube we tested, $10.31 against $12.20 at the small end, $16.77 against $30.95 at the big end. Fixed-price programs buy predictability across long distances, but for a known lane, quoting the actual box routinely finds cheaper. UPS Ground carried a 3-4 business day window on all three quotes.
The tier chart rewards geometry literacy: a flat 12 × 9 × 2 mailer-style box sits in the small tier while a chunky 8 × 8 × 8 cube costs a tier more, despite the cube looking humbler. When contents allow flattening, dropping a tier is a real discount lever.
Per ups.com, retrieved 2026-07-27, UPS accepts parcels to 150 lb, 108 inches long, and 165 inches of length plus girth. Those numbers dwarf USPS's 70 lb cap, which is why oversized and heavy boxes often end up on brown trucks by default.
Big-but-light boxes get charged on dimensional weight, a formula that converts volume into billable pounds. Before committing to an oversized carton, run it through our dimensional weight guide to see what the tape measure will cost you.
For Simple Rate, five tiers measured in cubic inches, per ups.com, retrieved 2026-07-27: extra small (1-100), small (101-250), medium (251-650), large (651-1,050) and extra large (1,051-1,728). Typical examples run from a 4 x 4 x 4 cube up to an 18 x 12 x 6 carton.
No. UPS states you can use any box or mailer up to one cubic foot for Simple Rate, and ordinary services accept any sturdy carton within the 150 lb and 108 inch limits published on ups.com, retrieved 2026-07-27. Every quote on this page priced a plain unbranded box.
Simple Rate starts at $12.20 extra small, $15.80 small, $18.95 medium, $24.85 large and $30.95 extra large, per ups.com, retrieved 2026-07-27. Our live 2026-07-27 quotes from Newark to Atlanta often beat those floors: $10.31 UPS Ground for a 1 lb extra-small cube, $13.23 for a 4 lb medium cube.
Up to 150 lb in weight, 108 inches in length, and 165 inches of length plus girth combined, per ups.com, retrieved 2026-07-27. Girth is twice the width plus twice the height, so a long narrow crate uses the allowance very differently than a cube.