Scientists have speculated anywhere to 10-14%, although the amount will vary depending on the individual.
It should be emphasised this is merely speculation and not based on any numerical evidence. It is a guesstimate based on the observations that some people seem to think more efficiently than others.
We, as humans, only use about 4-6% of our total brain capacity. Some people, though, might use a little more than average, but the more powerful one part becomes, the weaker it makes another part. A good example of this is Alber Einstein. He was probably one of the smartes men of the 19th century. It is beleived that he used just over 9% of his brain, but the thing that most people don't know about him is that he was autistic.
About 10% of your brain ---------------------------------- Actually you use just about all of your brain
You use your brain for 100% of your life. When your brain stops functioning, so do you.
20%
Isaac Newton use his brain to its maximum level he use his brain to 110 %
You use 7,000,000 brain cells.
10%
Your brain uses as much power as a ten watt battery. -Helen Brosnan
The myth of "You Only Use 10% of Your Brain" is not true and comes from a miss heard quote from Albert Einstein. In actual fact we use 100% of our brain
25%
1/4
appox 20 %
There is no such thing as "brain capacity"