Hi. I am looking to buy new lug nuts for my car but I am uncertain of the size. I drive a Honda Civic 2010 Sport with 16 inch oem rims. I assume it's 12mm/1.5 but I want to be sure. Thanks.

Try the Honda Dealer... I've found their parts department to offer fair prices on parts.

Under hubcaps or exposed chrome? 12mm is pretty small. My CRV uses a 19mm for an exposed lug, my Ridgeline uses a 22mm.

Forget what I paid for the last set I got... (replaced because they were beat up).. but they were cheaper for the pretty OEM ones at the dealer than aftermarket ones cost.

Whoever you buy the lug nuts from can verify the size needed but I think you have it correct.