US equity futures were little changed pre-bell Tuesday as traders looked ahead to economic data and comments from Federal Reserve Chair Jerome Powell.

Dow Jones Industrial Average futures were down 0.08%, S&P 500 futures were 0.2% lower, and Nasdaq futures were down 0.3%.

Oil prices were higher, with front-month global benchmark North Sea Brent crude up 0.8% at $67.26 per barrel and US West Texas Intermediate crude up 0.9% at $65.67 per barrel.

Powell is scheduled to speak at the European Central Bank's annual forum at 9:30 am ET.

The Purchasing Managers' Manufacturing Index, scheduled for release at 9:45 am ET, is seen coming in unchanged from the preliminary estimate of 52.0 for June, according to estimates compiled by Bloomberg.

The Institute for Supply Management's Manufacturing Index, slated for 10 am ET, is expected to increase to 48.8 for June from 48.5 previously. Forecasters see a 0.2% decrease in construction spending for May following a 0.4% decrease in April. Job openings based on the US Department of Labor's Job Openings and Labor Turnover Survey is seen coming at a 7.32 million rate for May versus 7.391 million in April.