Are they directly comparable, or is one easier than the other?
iv never done zerchers but im almost positive its harder to hold the weight with your arms than your back and stabalize.
reg squats are much easier. I just started doing zerchers they are very humbling.
I have a 265 max on regular squats and I've done 155 for 8 reps on zerchers. I'd simply they are harder because a) they hit your quads more and b) they beat the **** out of your arms.
You're going to do a lot less. Take your front squat and cut off about say 20%. That'd be a decent starting point IMO.
I train at home and have been doing zerchers since I don't have a squat rack. I finally got past 700 on the big 3 but I was afraid you guys were going to tell me 100 lbs. on zercher squats is only equal to 50 lbs on regular squat, and buck me down to 600 or so. Good to hear I'm a little ahead of the game for once!
RedSpikeyThing - yep, I come away with a couple nice bruises on my forearms afterwards. They'll toughen up eventually.