font-size:

H1 = 2/sqrt1 = 2
H2 = 2/sqrt2 = 1.414
H3 = 2/sqrt3 = 1.155
H4 = 2/sqrt4 = 1
H5 = 2/sqrt5 = 0.894
H6 = 2/sqrt6 = 0.816

H1=32
H2=24
H3=19
H4=16
H5=14
H6=13

item    rem   px   pt
.giant  3.38  54.4  41
.huge   2.95  47.2  35
.big    2.58  41.3  31
 h1     2.25  36.0  27
 h2     1.97  31.5  24
 h3     1.72  27.5  21
 h4     1.50  24.0  18
 h5     1.31  21.0  16
 h6     1.15  18.4  14
 p      1.00  16.0  12
.menus  0.87  13.9  10
.legal  0.76  12.2   9
.micro  0.67  10.7   8
.zilch  0.58   9.3   7

/* Font-Sizes using pt */
.giant { font-size:41pt; }
 .huge { font-size:35pt; }
  .big { font-size:31pt; }
    h1 { font-size:27pt; margin-top:0; }
    h2 { font-size:24pt; }
    h3 { font-size:21pt; }
    h4 { font-size:18pt; }
    h5 { font-size:16pt; }
    h6 { font-size:14pt; }
     p { font-size:12pt; margin-bottom:15pt; }
.menus { font-size:10pt; }
.legal { font-size: 9pt; }
.micro { font-size: 8pt; }
.zilch { font-size: 7pt; }

h1 { font-size: 24px;}
h2 { font-size: 22px;}
h3 { font-size: 18px;}
h4 { font-size: 16px;}
h5 { font-size: 12px;}
h6 { font-size: 10px;}