Freight class chart
Eighteen bands, from the densest and cheapest at class 50 to the lightest and most expensive at class 500.
| Class | Density, lb per cubic foot |
|---|---|
| 50 | 50 lb/ft³ and over |
| 55 | 35 to 50 lb/ft³ |
| 60 | 30 to 35 lb/ft³ |
| 65 | 22.5 to 30 lb/ft³ |
| 70 | 15 to 22.5 lb/ft³ |
| 77.5 | 13.5 to 15 lb/ft³ |
| 85 | 12 to 13.5 lb/ft³ |
| 92.5 | 10.5 to 12 lb/ft³ |
| 100 | 9 to 10.5 lb/ft³ |
| 110 | 8 to 9 lb/ft³ |
| 125 | 7 to 8 lb/ft³ |
| 150 | 6 to 7 lb/ft³ |
| 175 | 5 to 6 lb/ft³ |
| 200 | 4 to 5 lb/ft³ |
| 250 | 3 to 4 lb/ft³ |
| 300 | 2 to 3 lb/ft³ |
| 400 | 1 to 2 lb/ft³ |
| 500 | under 1 lb/ft³ |
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Reading the chart
Find your density in the right-hand column and the class is on the left. Each band is exclusive at the top: a density of exactly 8.0 is class 110, not 125.
If you do not know your density yet, the calculator works it out from dimensions and weight.
5050 lb/ft³ and over5535 to 50 lb/ft³6030 to 35 lb/ft³6522.5 to 30 lb/ft³7015 to 22.5 lb/ft³77.513.5 to 15 lb/ft³8512 to 13.5 lb/ft³92.510.5 to 12 lb/ft³1009 to 10.5 lb/ft³1108 to 9 lb/ft³1257 to 8 lb/ft³1506 to 7 lb/ft³1755 to 6 lb/ft³2004 to 5 lb/ft³2503 to 4 lb/ft³3002 to 3 lb/ft³4001 to 2 lb/ft³500under 1 lb/ft³