The ministers and central bankers were meeting in Horsham, 30 miles southwest of London, ahead of the G20 meeting in London, due to take place April 2.
"We are committed to deliver the scale of sustained effort necessary to restore growth," the statement said.
"Our key priority now is to restore lending by tackling, where needed, problems in the financial system," it said, adding that the G20 countries are ready to "take whatever action is necessary until growth is restored."
The statement also voiced a commitment "to fight all forms of protectionism and maintain open trade and investment."
The countries also agreed to substantially increase the resources of the International Monetary Fund, Britain's Chancellor of the Exchequer Alistair Darling told journalists.