cargo-mile demand

A shipping industry metric measuring volume multiplied by distance, reflecting the total demand for transport capacity.

Cargo-mile demand (often referred to as ton-mile demand in shipping) is a key metric used to measure the actual demand for global shipping capacity. It is calculated by multiplying the volume of cargo carried (in tons or units) by the distance it is transported (in miles or kilometers). This metric is highly important to maritime shipping investors because simple cargo volume does not tell the whole story. If global trade routes are disrupted—forcing ships to take longer routes (such as bypassing the Suez Canal to sail around Africa)—the cargo-mile demand increases sharply even if the physical volume of goods remains constant. An increase in cargo-mile demand effectively reduces the available supply of active vessels, which drives up shipping freight rates and boosts the profitability of shipping companies.

A tanker carrying 100,000 tons of crude oil over a traditional 3,000-mile route generates 300,000,000 ton-miles of demand. If geopolitical tensions force the tanker to reroute, traveling 9,000 miles instead, the demand is calculated as 100,000 tons 9,000 miles = 900,000,000 ton-miles, tripling the demand and tying up the vessel for three times as long.