We present to your attention a table with the theoretical weight of different paper densities depending on size.

Density Sheet format (cm) and weight (kg) 1000 sheets by format and density
g/m2 A4 A3 33×45 47×62 47×65 52×72 62×94 64×90 70×100
70 4.37 8.73 10.39 20.40 21.39 26.21 40.80 40.32 49.00
80 4.99 9.98 11.88 23.31 24.44 29.95 46.62 46.08 56.00
90 5.61 11.23 13.37 26.23 27.50 33.70 52.45 51.84 63.00
100 6.24 12.47 14.85 29.14 30.55 37.44 58.28 57.60 70.00
115 7.17 14.35 17.07 33.51 35.13 43.06 67.02 66.24 80.50
130 8.11 16.22 19.31 37.88 39.72 48.67 75.76 74.88 91.00
150 9.36 18.71 22.28 43.71 45.83 56.16 87.42 86.40 105.00
170 10.60 21.21 25.25 49.54 51.94 63.65 99.08 97.92 119.00
190 11.85 23.70 28.22 55.37 58.05 71.14 110.73 109.44 133.00
200 12.47 24.95 29.70 58.28 61.10 74.88 116.56 115.20 140.00
210 12.79 25.57 31.19 61.19 64.16 78.62 122.39 120.96 147.00
220 13.72 27.44 32.67 64.11 67.21 82.37 128.22 126.72 154.00
230 14.66 29.31 34.16 67.02 70.27 86.11 134.04 132.48 161.00
240 14.97 29.94 35.64 69.94 73.32 89.86 139.87 138.24 168.00
245 15.12 30.55 36.38 71.39 74.85 91.73 142.79 141.12 171.50
250 15.59 31.19 37.13 72.85 76.38 93.60 145.70 144.00 175.00
255 15.90 31,81 37.87 74.31 77.90 95.47 148.61 146.88 178.50
265   16,22   32,84 39.35 77.22 80.96 99.22 154.44 152.64 185.50
270   16,84   33,68 40.10 78.68 82.48 101.09 157.36 155.52 189.00
275   17,15   34,30 40.84 80.14 84.01 102.96 160.27 158.40 192.50
290   17,93   35,98 43.07 84.51 88.60 108.58 169.01 167.04 203.00
295   18,29   37,17 43.81 85.96 90.12 110.45 171.93 169.92 206.50
300   18,71   37,42 44.55 87.42 91.65 112.32 174.84 172.80 210.00
310   19,32   38,76 46.04 90.33 94.71 116.06 180.67 178.56 217.00
320   19,96   39,92 47.52 93.25 97.76 119.81 186.50 184.32 224.00
350   21,83   43,66 51.98 101.99 106.93 131.04 203.98 201.60 245.00