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.
To find out how many 20mm x 20mm squares fit in a square meter, first convert square meters to square millimeters. One square meter equals 1,000,000 square millimeters. Each 20mm x 20mm square has an area of 400 square millimeters. Dividing 1,000,000 by 400 gives you 2,500, so there are 2,500 of these squares in a square meter.
10mm = 1cm so to convert mm to cm just divide by 10 example; 20mm /10 = 2cm
weight of ms hollow bar 20mm*20mm