Ceramic Numbering Code

Generally, they use an alphanumeric marking system. The number part is the same as for SMT resistors, except that the value represented is in pF. They may also be written out directly, for instance, 2n2 = 2.2 nF. For capacitors the tolerance code is:

Tolerance Code	Tolerance
A	± 0.05 pF
B	± 0.1 pF
C	± 0.25 pF
D	± 0.5 pF
E	± 0.5%
F	± 1%
G	± 2%
H	± 3%
J	± 5%
K	± 10%
L*	± 15%
M	± 20%
N*	± 30%
P*	−0% +100%
S*	−20% +50%
W*	−0% +200%
X*	−20% +40%
Z	−20% +80%

letters with * are not used consistently.

how similar is this to resistors?

For example, .047K = .047 µF 10%.

The dielectric material is sometimes designated by another code: (note: the materials in the table below are not ceramic capacitors as implied, but plastic and paper)

Marking	Material
KT	Polyester Film / Foil
MKT	Metallized Polyester (PETP)
KC	Polycarbonate Film / Foil
MKC	Metallized Polycarbonate
KS	Polystyrene Film / Foil
KPS	foil/pps?
MPS	Metallized pps
KP	Polypropylene Film / Foil
MKP	Metallized Polypropylene
MP	Metallized paper

Please note that the table above is valid most of the time but not always because it is not a real standard. To be real sure you may check the data sheet from the manufacturer in mind.

The cap color can also indicate the dielectric:

more info at http://my.execpc.com/~endlr/markings.html