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You can't convert font size to logMAR. The size of font would depend on what size screen the chart is to be shown or which printer it would be printed on and what dpi the screen or printer is.
A logMAR eye test chart should be in the standard SLOAN font, you can download it from the internet. The letters in the top line of the chart should measure 44mm in height and have a letter spacing of 200% for a chart to be read at a distance of 3 meters. This line will correspond to the 20/200 or 6/60 line of the eye test chart. You can then work out all the other lines as follows:
Foot
Metre
Decimal
LogMAR
Size@3m
20/200
6/60
0.10
1.00
44.00mm
20/160
6/48
0.125
0.90
35.20mm
20/125
6/38
0.16
0.80
27.50mm
20/100
6/30
0.20
0.70
22.00mm
20/80
6/24
0.25
0.60
17.60mm
20/63
6/19
0.32
0.50
13.90mm
20/50
6/15
0.40
0.40
11.00mm
20/40
6/12
0.50
0.30
8.80mm
20/32
6/9.5
0.63
0.20
7.00mm
20/25
6/7.5
0.80
0.10
5.50mm
20/20
6/6.0
1.00
0.00
4.40mm
20/16
6/4.8
1.25
−0.10
3.52mm
20/12.5
6/3.8
1.60
−0.20
2.75mm
20/10
6/3.0
2.00
−0.30
2.20mm
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Mar Muro goes by Mar Muro.
How is jak mar?
Jak is mar
