The Cost
  While supplies that moved over the road were lend-lease (to be paid for or returned) the cost of building the road itself was borne mostly by the United States. The exact cost could not be determined for various reasons, including the fact that some of the costs attributed to building the road were actually incurred on other smaller projects carried out by the road engineers.

The final estimated cost:
U.S. Troop labor.................. $ 31,766,000
Materials and Supplies............   33,912,000
Equipment, fuel, repairs..........   51,956,000
Overhead..........................   19,424,000

Sub-Total.........................  137,058,000

Chinese Troop labor...............    2,410,000
Indian military, civilian labor...    9,442,000

Sub-Total.........................   11,852,000

Grand Total....................... $148,910,000

Present Day (2017) Dollars...... $2,019,755,006