About 6 inches
148 millimeters is 5.83 inches.
105 × 148mm or 4.1 × 5.8 inches
148mm = 14.8cm
Oh, dude, math time! So, to convert 210 x 148mm into inches, you just divide each measurement by 25.4 (since there are 25.4 millimeters in an inch). That gives you roughly 8.27 x 5.83 inches. Easy peasy, right? Like, who even uses inches anymore?
10mm = 1cm => 1mm = 1/10 cm => 148mm = 148 / 10 cm = 14.8cm
14.8cm
14.8 cm
148mm
105mm × 148mm
148mm × 210mm
Every A-size paper halves the size of last, so A6 paper is 1/4 the size of A4 paper. An A6 page is 105mm (4.134") × 148mm (5.827") or 24 square inches.