This is the lowest level of Wholesale Price Index (WPI) inflation since December 2009 when it was 4.95 per cent.
Inflation based on the WPI stood at 6.84 per cent in February. In March 2012, it was 7.69 per cent.
Food inflation, which has 14.34 per cent share in the WPI basket, declined to 8.73 per cent in March from 11.38 per cent in February.
Commenting on the inflation numbers, Planning Commission Deputy Chairman Montek Singh Ahluwalia said inflationary pressure is coming down gradually.
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"Inflation behaviour is consistent with what government has been saying that it is slowly coming under control," he said.
Experts said WPI has come down mainly on easing of fruits and vegetable prices, but retail inflation continues to be in double digit as food inflation remains structurally high.
"The easing has happened on account of a significant decline in global commodity prices in March and growing deflationary trends in manufacturing sector. I expect RBI to reduce both the repo rate and CRR by 0.25 per cent," Bank of Baroda Chief Economist Rupa Rege Nitsure said.
The decline in March inflation and a slowdown in industrial output growth to 0.6 per cent in February has raised expectations of rate cut by RBI to boost growth. RBI will announce its annual policy on May 3.