Mass Effect 3 sales for its launch month of March were 1.3 million units across Xbox 360, PS3 and PC, the NPD informed Joystiq. The number covers purely new physical retail sales, so no digitally distributed product on PC or PS3 is tallied.
Although the NPD doesn't publicly share sales breakdowns by platform, Microsoft executive Aaron Greenberg did share that Xbox 360 sales for the space opera were 943K units for the month.
Mass Effect 2 had over a half-million sales on Xbox 360 during its debut month, with another quarter million the following month. We've contacted Electronic Arts for further clarification on Mass Effect 3 sales data.
Update: "We think the monthly NPD reports are a very poor indicator of the industry's performance given the proportion of digital sales – including digital downloads via Origin, DLC, mobile and social games and much more – that are not captured in their reports," John Reseburg of EA's corporate communications told Joystiq. "Taking these reports as an accurate snapshot of the industry today is a dangerous assumption."