I always see threads of people asking if they have a pullet or a cockerel, so I thought I would start an article on the subject. Here is a very helpful pic.
Pullet on left with smaller comb and darker color. Cockerel on the right, with more white than pullet, and larger comb and wattles.
Mostly what you would look at are the comb and wattles. The comb on a cockerel are always much larger and more pinkish red than a pullets. A pullet has a small comb mostly, Unless the breed has a super large comb, like leghorns for example. Also a pullets comb is a orange color unlike cockerels. Mostly pullets and cockerels are the same color, so you can't really go off that. Sexlinks are different colors though.
Red stars links you can sex at hatch.
Females are red, males are white.
The yellowish white chicks are males, the red chicks are females.
Buff Orpington Pullet. Small comb, no sign of red in comb.
Buff Orpington cockerel. Large comb, Pinkish red comb.
Wing sexing one day old chicks. This is really the only way to sex one day old chicks.
This is a RIR cockerel.
This is a RIR pullet.
Also, her is a very helpful video I found on YouTube.