Band edge — Class 400
24 × 24 × 24 in · 4 lb
Expected: 0.50 pcf → Class 400
Calculator Test Cases
The cases we hold this calculator to, published so you can check the math yourself. Every case below links straight into the calculator with the numbers filled in.
Tested Nov 7, 2026Against the scale in effect since Jul 19, 2025Table: NMFC Docket 2025-1
The case old density calculators fail
40 × 48 × 48 in, 20 lb — one very light pallet. Volume 53.33 ft³, density 0.38 pcf.
Expected: Class 400
Density calculators still using the pre-2025 density table answer 500 for this pallet. Class 500 no longer comes out of the density scale — if a density tool gives you 500, its density table is out of date (a specific NMFC item can still carry Class 500). Run it here.
Exactly on the line
24 × 24 × 24 in, 80 lb — density exactly 10.00 pcf.
Expected: Class 92.5. Band edges belong to the denser band: 10.00 pcf is the first density of the 92.5 band, not the last of the 100 band. Run it here.
One boundary case for every class
Each case is a 24 × 24 × 24 in cube (8.00 ft³) weighted to land exactly on the lower edge of one band — the first density that earns that class.
Band edge — Class 300
24 × 24 × 24 in · 8 lb
Expected: 1.00 pcf → Class 300
Band edge — Class 250
24 × 24 × 24 in · 16 lb
Expected: 2.00 pcf → Class 250
Band edge — Class 175
24 × 24 × 24 in · 32 lb
Expected: 4.00 pcf → Class 175
Band edge — Class 125
24 × 24 × 24 in · 48 lb
Expected: 6.00 pcf → Class 125
Band edge — Class 100
24 × 24 × 24 in · 64 lb
Expected: 8.00 pcf → Class 100
Band edge — Class 92.5
24 × 24 × 24 in · 80 lb
Expected: 10.00 pcf → Class 92.5
Band edge — Class 85
24 × 24 × 24 in · 96 lb
Expected: 12.00 pcf → Class 85
Band edge — Class 70
24 × 24 × 24 in · 120 lb
Expected: 15.00 pcf → Class 70
Band edge — Class 65
24 × 24 × 24 in · 180 lb
Expected: 22.50 pcf → Class 65
Band edge — Class 60
24 × 24 × 24 in · 240 lb
Expected: 30.00 pcf → Class 60
Band edge — Class 55
24 × 24 × 24 in · 280 lb
Expected: 35.00 pcf → Class 55
Band edge — Class 50
24 × 24 × 24 in · 400 lb
Expected: 50.00 pcf → Class 50
Different pieces, different classes
Piece 1: 48 × 40 × 48 in, 500 lb → 9.38 pcf → Class 100
Piece 2: 24 × 24 × 24 in, 100 lb → 12.50 pcf → Class 85
Blended across the shipment: 600 lb ÷ 61.33 ft³ = 9.78 pcf → Class 100 — shown as a reference only. Carriers rate the two pieces at their own classes, 100 and 85, not at the blend. Run both pieces.
What "last checked" means
Every page on this site carries a "last checked" date. On that date we went through the 13-band density table this site uses line by line — every boundary — re-ran every case on this page through the calculator's own code, and re-computed the numbers printed here a second, independent way. Everything matched. If the table or the code ever changes, the date moves.
All expected results are computed from the same 13-band table the calculator uses, and the build that produced this page re-checks every case automatically. Spotted a case we should add? The full method is in how to calculate freight class.