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Good question. steemit doesn't show it anywhere that I am aware of. I always check it on steemd.com. Here's the link to your stats;

https://steemd.com/@valblomqvist

edit to add: most people think it's best to keep it above 90%. It recharges over time. The lower it goes the less you give people with an upvote. You can increase the number by adding more steem power to your wallet.
2nd edit: I don't want to confuse steem power with voting power. It is your voting power that decreases with each vote and recharges over time. That number relative to your steem power is what determines how much you give with a vote. For the maximum payout for a vote your voting power needs to be at 100%.

This site is another way to view your stats and has an upvote calculator in the top left corner that will show you how much your vote is worth.

https://steemnow.com/@valblomqvist

i see so nice
thx so much so i have to transfer all to steem power i get it
ok thx so much
i will check that link coooool xD

You're welcome.
I can see in your wallet you have right now 32 steem power. Of that 28 have been delegated to you for being a new user. When you get paid for your posts after 7 days then you will have more steem which can then be converted to steem power with the 'power up' option.
Also something good to know is that when you create a post you can choose to make the payout 100% steem power. I am doing this on all my posts for now because I am still new and want to be able to give people more with my upvotes.

thx yeah i understand
i also doing same 100% steem power
but when i publish from Dtube i cannot do it : (