10. Great Ape
This is the staple form for all Saiyans. To achieve it, a Saiyan that possesses a tail must look at a moon, and they will transform immediately. In the event of there not being a moon, a Saiyan may make their own via a special ki blast. The reason Saiyans transform by the moon is due to the moon emitting Blutz Waves. A pack of Great Apes have the power to raze a planet.
9. Super Saiyan
This is the iconic Super Saiyan form. First used by Goku on Planet Namek, it can be achieved after a Saiyan experiences extreme emotions. With it, Goku was able to best Frieza, who as at the time the strongest being in the universe. The user's hair becomes golden and spiky, and they acquire 50x more power than they possess.
8. Super Saiyan 2
Super Saiyan 2 is the next transformation after Super Saiyan. First used by Gohan, it can also be achieved by extreme emotions. It allowed Gohan to overpower Cell and his Solar Kamehameha. The user's hair becomes even spikier than a normal Super Saiyan, and electricity appears in their aura. It gives a Saiyan 100x more power than they possess.
7. Legendary Super Saiyan
Legendary Super Saiyan is a form only seen by Broly. It is achieved by extreme blood lusted rage. The user gets more bulk in their muscles, and their hair turns light green and spiky. With it, Broly was able to take on the combined might of a Super Saiyan Goku, Gohan, Trunks, and Vegeta and still push them back. It is unknown how much power it gives its user, but I am sure it is pretty big.
6. Super Saiyan 3
Super Saiyan 3 is the form after Super Saiyan 2. It was first achieved by Goku after harsh training in Other World. It can be achieved by training, extreme emotions, or a Zenkai Boost. The user's hair grows into a golden, spiky mullet that reaches their lower back. The form gives Saiyans a whooping 400x more power than their base forms. However, this form causes a drain on energy if used too long.
5. Golden Great Ape
If a Saiyan possess a tail, and can turn Super Saiyan, they are able to become a Golden Great Ape. The Saiyan must look at a moon and they will become one. A Golden Great Ape is leagues stronger than a normal Great Ape, even surpassing Super Saiyan 3. However, it is hard to control, as the user regains their latent feral nature. It is 500x stronger than base form.
4. Super Saiyan 4
Super Saiyan 4 is the next form after Super Saiyan 3. It is achieved by regaining your humanity after turning into a feral Golden Great ape. After controlling the Golden Great Ape, the Saiyan grows red fur on their bodies and their tails. This form can also be gained by absorbing rays from a Blutz Wave Generator. Super Saiyan 4 is the uppermost limits of Saiyan.
3. Super Saiyan Rage
Super Saiyan Rage is a form of mystery. It was achieved by Future Trunks while fighting Zamasu and Goku Black. It is gained by a Saiyan feeling absolute rage. The user's body gets heavier, their eyes turn white, and a yellow and blue aura surounds them. With it Future Trunks was able to hold back a Super Saiyan Rose Goku Black and immortal Zamasu.
2. Super Saiyan Blue
Super Saiyan Blue is a form used by Goku and Vegeta. It gives a Saiyan access to god ki. It can be attained by training with a god. This form is the combination of Super Saiyan ki and some god ki. It can be improved by adding the Kaioken technique to it, greatly improving pwer. Goku Black used a variation of this form known as Super Saiyan Rose.
1. Super Saiyan god
Super Saiyan god is by far the strongest Saiyan transformation we have seen. This form is achieved by five pure hearted Saiyans pouring their ki into one pure hearted Saiyan. The user's body gets slightly skinnier, their hair and eyes turn red, and a fiery aura radiates from them. With this form, Goku was able to go toe to toe with the god of destruction Beerus, even matching 70% his power. Their battle sent ripples across the universe, almost destroying it. However, the form has a time limit and will run out after a while. This transformation allows its user to heal from wounds and breathe in space.