Just got married, both of us work, no kids...what witholding?

I just got married this year. I always have file as single and claimed 1 on federal and 0 on state. My spouse claims 1 on both and filed single until now of course. He makes about 44k a year and I make about 30k. Will we owe at the end of the year if he stays at his current withholding and I claim 0 on all? We would rather be safe then sorry even if it means giving the IRS an interest free loan all year. They don't give interest free loans if we mess this up so we want be certain we wont owe. Are we good with these withholding's?