Calculate CBM in Inches

The fastest way to calculate CBM in inches is with our free online CBM calculator. Enter length, width and height in inches, set quantity and weight, and we instantly convert the result to cubic meters (m³), cubic feet (ft³), volumetric weight and container fit — including 20ft, 40ft and 40HC.

Inches to CBM formula

CBM = (Length × Width × Height in inches) ÷ 61,023.74 × Quantity. Or convert each side to meters first by dividing by 39.37, then multiply L × W × H × Qty. Both methods give the same answer; the divisor 61,023.74 is simply 39.37³.

Example 1 — Standard US export carton

• Carton: 24 × 18 × 12 inches
• Volume per carton = 24 × 18 × 12 ÷ 61,023.74 ≈ 0.0849 CBM
• 50 cartons → 0.0849 × 50 ≈ 4.25 m³
• Equivalent CFT ≈ 150 ft³

Example 2 — Large furniture carton

• Box: 48 × 30 × 24 inches
• Volume per box = 48 × 30 × 24 ÷ 61,023.74 ≈ 0.5663 CBM
• 20 boxes → 11.33 m³ — comfortable LCL
• 40 boxes → 22.65 m³ — close to a 20ft FCL (see 20ft specs)

Why calculate CBM in inches?

Most US, UK and many Asian factories quote carton dimensions in inches. A reliable inches to CBM calculator avoids manual conversion errors that lead to wrong freight quotes, overbooked containers and invoice disputes with shipping lines and customs brokers.

Use cases for an inches-to-CBM calculation

• Ocean LCL and FCL bookings priced per CBM
• Air freight volumetric weight (divisor 6000 cm³/kg)
• Courier shipments via DHL, FedEx and UPS (divisor 139 in³/lb)
• Warehouse 3PL storage billed per cubic meter or pallet
• Amazon FBA inbound shipment size planning

Inches to CBM quick conversion table

• 12 × 12 × 12 in → 0.028 CBM (1 ft³)
• 18 × 12 × 12 in → 0.042 CBM
• 24 × 18 × 12 in → 0.085 CBM
• 30 × 20 × 18 in → 0.177 CBM
• 48 × 40 × 36 in → 1.133 CBM (one full pallet stack)

Open the free online CBM calculator to start measuring in inches, or read how to measure CBM, CBM in cm and CBM in feet.