Minato had a really big chakra reserve.

[Megatolium]

To use FTG continually, to contain the seal at Kushina's birth, to summon gamabunta, then to finish it off with Death God Sealing Jutsu.

Hell thats alot of chakra. How strong was he?

 

[Zlad]

Tobi still have more chakra, hehe

 

[Shouten]

You forgot using space time barrier jutsu to get the tailed beast bomb detonate outside of konoha and transporting the Kyuubi with FTG somewhere safe.

 

[sindi1997]

enough to be number 8 ninja i naruto univers

 

[WhistleBlower]

he was hell of a strong shinobi..konoha was lucky to have him

like you said he did alot with a alot of his chakra + he was able to to take on 4 raikage guy who even now seems pretty strong..well not now his with the other kage taking a quick nap aha

 

[neilson]

he is or was very powerful thats why i call him....wait for it.....wait for it....legen....DARY