how to calculate chequered plate weight

{"cid":"91222377","title":"347 ASTM Standard S235 Chequered Plate Weight Calculator 4.5mm Anti-slip MS Mild Steel Checkered Floor Plate","imgUrl":"https:\/\/img.chinax.com\/nimg\/63\/39\/a660db8e3b590f134b3b97f2f3ab-200x200-1.jpg","attrs":{"Price":"$680.00\/tons 5-199 tons","Brand Name":"Jinhongtong","Minimum Order Quantity":"5 tons","Delivery Time":"Within 15-45 days","Grade":"201, 304, 316 Series, etc.","Standard":"ASTM","Length":"2 - 6 m","Thickness":"1.5-15mm, 1.5-15mm 0.3-3.0mm","Width":"1000 1220 1500 1800 2000mm","Place of Origin":"Shandong, China","Type":"Plate","Application":"Plate\/Coil","Tolerance":"\u00b11%","Processing Service":"Bending, Welding, Decoiling, Punching, Cutting","Steel Grade":"301L, 301, 304N, 310S, S32305, 410, 204C3, 316Ti, 316L, 441, 316, L4, 420J1, 321, 410S, 410L, 443, LH, L1, S32304, 314, 347, 430, 309S, 304, 439, 204C2, 425M, 409L, 420J2, 436, 445, 304L, 405, 370, S32101, 904L, 444, 301LN, 305, 429, 304J1, 317L","Surface Finish":"2B","Product name":"304 Stainless Steel Plate","Keyword":"Staninless Steel Sheet","Technique":"Hot Rolled Cold Rolled","Material":"201\/202\/304\/309\/309S\/310\/310S\/304\/304L\/316\/316L\/316Ti","MOQ":"5 Tons","Surface":"NO.1\/2B\/BA\/NO.4\/8K\/SB\/HL\/Embosses\/Etched\/Decorate Stainless Steel","Shape":"Flat.sheet.coil.plate","Color":"Natural Color","Packing":"Standard Sea-worthy Packing","Payment Terms":"T\/T, 100% L\/C at sight, Cash, Western Union"}}