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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	Freight class 50 — 50 lb/ft³ and over
55	Freight class 55 — 35 to 50 lb/ft³
60	Freight class 60 — 30 to 35 lb/ft³
65	Freight class 65 — 22.5 to 30 lb/ft³
70	Freight class 70 — 15 to 22.5 lb/ft³
77.5	Freight class 77.5 — 13.5 to 15 lb/ft³
85	Freight class 85 — 12 to 13.5 lb/ft³
92.5	Freight class 92.5 — 10.5 to 12 lb/ft³
100	Freight class 100 — 9 to 10.5 lb/ft³
110	Freight class 110 — 8 to 9 lb/ft³
125	Freight class 125 — 7 to 8 lb/ft³
150	Freight class 150 — 6 to 7 lb/ft³
175	Freight class 175 — 5 to 6 lb/ft³
200	Freight class 200 — 4 to 5 lb/ft³
250	Freight class 250 — 3 to 4 lb/ft³
300	Freight class 300 — 2 to 3 lb/ft³
400	Freight class 400 — 1 to 2 lb/ft³
500	Freight class 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 over 5535 to 50 lb/ft³ 6030 to 35 lb/ft³ 6522.5 to 30 lb/ft³ 7015 to 22.5 lb/ft³ 77.513.5 to 15 lb/ft³ 8512 to 13.5 lb/ft³ 92.510.5 to 12 lb/ft³ 1009 to 10.5 lb/ft³ 1108 to 9 lb/ft³ 1257 to 8 lb/ft³ 1506 to 7 lb/ft³ 1755 to 6 lb/ft³ 2004 to 5 lb/ft³ 2503 to 4 lb/ft³ 3002 to 3 lb/ft³ 4001 to 2 lb/ft³ 500under 1 lb/ft³