Sherlock's Heart: (Size of Heart = bigger than he thinks)
John (55%)
Mrs. Hudson (8%)
Lestrade (8%)
Mary (8%)
Rosie (8%)
Molly (4%)
The Woman (4%)
Mom (2%)
Dad (2%)
Mycroft (1%)
John's Heart: (Size of Heart = enormous)
Rosie (26%)
Mary (25%)
Sherlock (24%)
Mrs. Hudson (8%)
Lestrade (6%)
Molly (6%)
Major Sholto (2%)
Mike Stamford (2%)
Harry (1%)
Mycroft's Heart: (Size of Heart = very small)
Sherlock (98%)
Mom (1%)
Dad (1%)
Mary's Heart: (Size of Heart = unknown)
Rosie (60%)
John (30%)
Sherlock (10%)
Rosie's Heart: (Size of Heart = too soon to say)
Mommy (40%)
Daddy (30%)
Uncle Sherlock (15%)
Grandma Hudson (10%)
Molly (2%)
Lestrade (2%)
Aunt Harry (1%)
I am aware that this is not entirely accurate anymore (mostly because one of these characters, I won't say which because of spoilers, is now dead), but I will probably post another one of these after the end of Season 4, after the dust has had a chance to settle (namely, after the whole Sherrinford thing has been cleared up).
Why no Redbeard? He may occupy a significant portion of Sherlock's heart, but I only include characters who are still alive (just for the sake of ease, not because dead characters mean any less than they did when they were alive), which is why I will need to post another one of these later now that another character in Sherlock's heart is dead.

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Random Sherlock Headcanons
FanfictionThese are just some random headcanons about BBC's Sherlock.