What is the US customs limit on the amount of cash I can carry from India to USA?

Import of Currency Regulations in the US

Foreign Currency and Local Currency (USD)- There is no limit to bring USD or any other currency in the US. You may bring upto USD 10,000 in form of currency notes, coins, travelers check etc. But, if you bring more than USD 10,000 into the country, you must declare it to the customs.

Export of Currency Regulations in the US

Foreign Currency and Local Currency (USD)- There is no limit to carry foreign exchange from US to India. If the amount exceeds USD 10,000 in monetary instruments, including travelers checks and U.S. or foreign money, you are required to declare the amount to the customs.