1 mm = 0.03937 inch
Multiply your numbers by that to convert them.
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Divide by 1000.
1 cubic meter of grave contains 50 square meters at 20mm depth (1000mm / 20mm = 50). 2860 / 50 = 57.2 So you need 57.2 cubic meters of gravel.
10mm = 1cm so to convert mm to cm just divide by 10 example; 20mm /10 = 2cm
weight of ms hollow bar 20mm*20mm
great website for this: http://www.simetric.co.uk/metres_to_feet.php Direct Conversion Formula20 mm* 1 in 25.4 mm = 0.7874015748 in