Board Thread:Naruto Discussions/@comment-24312338-20180222140450/@comment-734582-20180225191551

LordWhis wrote: So, is there any actual proof of this or is it some Tsunade fanboy's wet dream ! Edo Madara implies that in order to use healing without seals, you need chakra comparable to Hashirama. Considering that Hashirama's chakra rivalled a biju... well 100x seems reasonable. Other characters with massive chakra (e.g. Jinchuriki) also healed quickly and easily. Considering many other people known to have large amounts of chakra (e.g. various Kage) don't, then we can estimate that Tsunade is biju-level with the Hundred Healings. We don't know her base level chakra, but if it's comparable to Jiraiya then indeed the difference would be around 2 orders of magnitude.

Keep in mind that Hundred Healings works by using chakra to force cells to regenerate, yet such brute force healing is rare.

Another argument you could put forth is that it's called "Hundred healings" and "Strength of a hundred" for a reason.

A final argument you could make is by looking at order-of-magnitude effects. Base tsunade certainly isn't healing by brute force. She also isn't tanking massively or breaking Susanoo in base (or at least, nothing to that end is ever shown). If she got 10x base chakra and strength, then people like Nagato should be healing without seals, but they aren't. If she got 100x that, then we're probably in low biju level. 100x the chakra would allow Sakura to create the seal in 3 years while operating at 90% chakra levels. So yea, 100x base seems fine.

Eight gates overcomes one's natural limit and judging by people's strength, could easily thousandfold or ten thousand fold one's strength. Hundred Healings and Strength of a Hundred operates on similar principles. So 100x base isn't that crazy in the realm of Naruto either.