(Corrects number in para 3 to ... 830 billion yen, ... not ... 830 yen)

The Group of Seven (G7) countries may have sold a total of around 530 billion yen ($6.5 billion) on Friday as they intervened in forex markets to weaken the currency, data from the Bank of Japan showed on Tuesday.

Any yen the BOJ and other central banks sold for dollars would be paid into banks on Wednesday as currency trades are settled two business days after transactions and the country's markets were closed for a holiday on Monday.

The BOJ's projection for Wednesday's money markets showed there would be 830 billion yen in payments to banks from the public sector. That is 530 billion yen more than the about 300 billion yen of payments from the government that money brokers had been expecting ahead of intervention.

Market players say the difference between their expectations and the projection is likely to indicate how much yen G7 central banks sold on Friday, although money broker estimates are ballpark figures with a margin for error.

The Group of Seven (G7) countries intervened jointly to stem the yen's strength on Friday -- their first coordinated currency intervention in more than a decade -- after the yen soared to a record high of 76.25 yen per dollar.

The U.S. Federal Reserve, Bank of England, Bank of Canada and European Central Bank, which represents all 17 countries that use the euro, each separately confirmed they intervened to keep the yen's value from climbing.

Still, the BOJ's intervention was thought to be by far the largest.

It Also marked the first time Japan had intervened since September 15, when it sold 2.12 trillion yen, a record daily amount.

The Ministry of Finance will announce on March 31 how much it spent on currency market intervention in March. ($1 = 81.045 Japanese Yen)

(Reporting by Hideyuki Sano; Editing by Joseph Radford)