Is 81× 88 big enough for a King?
 

I'm trying to figure out if this quilt will be big enough for a king sized bed, or if I should figure out a way to enlarge it.

A standard king mattress is 76x80", so you would have 2.5" overhang on each side, and 8" overhang at the foot (assuming no pillow tuck). I would definitely try to enlarge it, unless it's going to be used over top of a more generously sized quilt or bedspread.

It will fit a king size bed (with no drape included). My king size mattress is 79x 81. A California King mattress is roughly 72 x 84 inches.
With a drape, it will be more like 110" x 108" give or take.

Google says a king size mattress is about 76 x 80

Missouri Star Quilt Co put out a chart with quilt sizes here:
https://forum.missouriquiltco.com/sh...ad.php?t=64224

Edit: oops...looks like we posted at the same time, Jennifer. :)

I would make it bigger, unless you want it to just lie on top of the bed. I like at least 12" overhang on sides.

I make a lot of kings. I like them about 114"minimum to 120" square.

120 x120 makes a generous king.

I"m using an old king 96x112 on my full size bed. of course the bed is on risers and has a 3 inch foam topper on the mattress. 16 inch blocks.

I just finished a King for our bed and it measured 100 x 115. I was very happy with it. I like overhang on the sides.

For what my two cents' is worth, I have made several king size and I make them about 110 x 110.

Big enough if you want it as a quilt as it covers the top of the bed.
Not big enough, for the humps of people under that quilt ... without fighting!

Not big enough for a "bedspread" quilt ... as already mentioned by others.

What fits for others king beds, may or may not work for you.

A lot of variation on sizes according to .....
* mattress depth
* height of bed from floor
* do you want pillow tuck allowance?
* drape desired on sides
* is there a footboard to tuck into? or drape required there

There's probably some other factors, but this is a start.