How to calculate vests to Steem Power?
I don't know if there's a calculator out there you can use, but the calculation is simple enough to do yourself.
First you go to http://Steemd.com and scroll down until you see "Vesting Funds" on the right hand side. It should look something like this-
Vesting fund
192,931,254 STEEM
391,214,682,664 VESTS
0.000493160 SPV
You take the amount of VESTS, currently 391,214,682,664, and divide that by the STEEM, currently 192,931,254.
391,214,682,664
--------------- = 2027.74136 VESTS/Steem Power.
192,931,254
If you needed for instance 20 Steem Power, you can do
2027.74136 * 20 = 40554.8272 VESTS.
If you wanted to find the Vests/Steem Power for a delegation, you could instead just use a Steem Power link like this -
The Delegator can be left blank, and the Delegatee= would have your name afterwards. To change how much Steem Power you want to delegate, you can change the second to last number, the 20% in 20%20SP to whatever amount of SP you like.