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Hoe reken je vierkante meter naar vierkante voet om?

Vermenigvuldig met 10,76, het kwadraat van de lengtefactor (3,28 voet per meter, en 3,28² ≈ 10,76). Uit het hoofd vermenigvuldigt u met 10 en telt u er 8% bij: 70 m² → 700 + 56 = 756 sq ft, tegenover 753 exact.

vierkante voet = vierkante meter × 10,76vierkante meter = vierkante voet ÷ 10,76

Waar deze twee eenheden dienen

De vierkante meter draagt de woonoppervlakte in bijna elk land en ligt onder de vastgoedprijzen overal waar het metrieke stelsel regeert. De vierkante voet is de eenheid van vastgoedadvertenties in de Verenigde Staten en het Verenigd Koninkrijk, en van kantoorhuur op verscheidene Aziatische markten.

Gangbare woningoppervlakten

1 m²10,76 ft²
9 m² (minimale slaapkamer)97 ft²
12,5 m² (parkeerplaats)135 ft²
20 m² (studio)215 ft²
45 m² (tweekamerappartement)484 ft²
70 m² (driekamerappartement)753 ft²
100 m² (woonhuis)1.076 ft²
150 m²1.615 ft²
200 m²2.153 ft²
261 m² (tennisbaan)2.809 ft²
10.000 m² (1 ha)107.639 ft²
Alle waarden tonen
  • 1 m² = 10,76 ft²
  • 2 m² = 21,53 ft²
  • 3 m² = 32,29 ft²
  • 4 m² = 43,06 ft²
  • 5 m² = 53,82 ft²
  • 6 m² = 64,58 ft²
  • 7 m² = 75,35 ft²
  • 8 m² = 86,11 ft²
  • 9 m² = 96,88 ft²
  • 10 m² = 107,64 ft²
  • 11 m² = 118,4 ft²
  • 12 m² = 129,17 ft²
  • 13 m² = 139,93 ft²
  • 14 m² = 150,69 ft²
  • 15 m² = 161,46 ft²
  • 16 m² = 172,22 ft²
  • 17 m² = 182,99 ft²
  • 18 m² = 193,75 ft²
  • 19 m² = 204,51 ft²
  • 20 m² = 215,28 ft²
  • 21 m² = 226,04 ft²
  • 22 m² = 236,81 ft²
  • 23 m² = 247,57 ft²
  • 24 m² = 258,33 ft²
  • 25 m² = 269,1 ft²
  • 26 m² = 279,86 ft²
  • 27 m² = 290,63 ft²
  • 28 m² = 301,39 ft²
  • 29 m² = 312,15 ft²
  • 30 m² = 322,92 ft²
  • 31 m² = 333,68 ft²
  • 32 m² = 344,45 ft²
  • 33 m² = 355,21 ft²
  • 34 m² = 365,97 ft²
  • 35 m² = 376,74 ft²
  • 36 m² = 387,5 ft²
  • 37 m² = 398,26 ft²
  • 38 m² = 409,03 ft²
  • 39 m² = 419,79 ft²
  • 40 m² = 430,56 ft²
  • 41 m² = 441,32 ft²
  • 42 m² = 452,08 ft²
  • 43 m² = 462,85 ft²
  • 44 m² = 473,61 ft²
  • 45 m² = 484,38 ft²
  • 46 m² = 495,14 ft²
  • 47 m² = 505,9 ft²
  • 48 m² = 516,67 ft²
  • 49 m² = 527,43 ft²
  • 50 m² = 538,2 ft²
  • 51 m² = 548,96 ft²
  • 52 m² = 559,72 ft²
  • 53 m² = 570,49 ft²
  • 54 m² = 581,25 ft²
  • 55 m² = 592,02 ft²
  • 56 m² = 602,78 ft²
  • 57 m² = 613,54 ft²
  • 58 m² = 624,31 ft²
  • 59 m² = 635,07 ft²
  • 60 m² = 645,83 ft²
  • 61 m² = 656,6 ft²
  • 62 m² = 667,36 ft²
  • 63 m² = 678,13 ft²
  • 64 m² = 688,89 ft²
  • 65 m² = 699,65 ft²
  • 66 m² = 710,42 ft²
  • 67 m² = 721,18 ft²
  • 68 m² = 731,95 ft²
  • 69 m² = 742,71 ft²
  • 70 m² = 753,47 ft²
  • 71 m² = 764,24 ft²
  • 72 m² = 775 ft²
  • 73 m² = 785,77 ft²
  • 74 m² = 796,53 ft²
  • 75 m² = 807,29 ft²
  • 76 m² = 818,06 ft²
  • 77 m² = 828,82 ft²
  • 78 m² = 839,59 ft²
  • 79 m² = 850,35 ft²
  • 80 m² = 861,11 ft²
  • 81 m² = 871,88 ft²
  • 82 m² = 882,64 ft²
  • 83 m² = 893,4 ft²
  • 84 m² = 904,17 ft²
  • 85 m² = 914,93 ft²
  • 86 m² = 925,7 ft²
  • 87 m² = 936,46 ft²
  • 88 m² = 947,22 ft²
  • 89 m² = 957,99 ft²
  • 90 m² = 968,75 ft²
  • 91 m² = 979,52 ft²
  • 92 m² = 990,28 ft²
  • 93 m² = 1.001,04 ft²
  • 94 m² = 1.011,81 ft²
  • 95 m² = 1.022,57 ft²
  • 96 m² = 1.033,34 ft²
  • 97 m² = 1.044,1 ft²
  • 98 m² = 1.054,86 ft²
  • 99 m² = 1.065,63 ft²
  • 100 m² = 1.076,39 ft²
  • 101 m² = 1.087,15 ft²
  • 102 m² = 1.097,92 ft²
  • 103 m² = 1.108,68 ft²
  • 104 m² = 1.119,45 ft²
  • 105 m² = 1.130,21 ft²
  • 106 m² = 1.140,97 ft²
  • 107 m² = 1.151,74 ft²
  • 108 m² = 1.162,5 ft²
  • 109 m² = 1.173,27 ft²
  • 110 m² = 1.184,03 ft²
  • 111 m² = 1.194,79 ft²
  • 112 m² = 1.205,56 ft²
  • 113 m² = 1.216,32 ft²
  • 114 m² = 1.227,09 ft²
  • 115 m² = 1.237,85 ft²
  • 116 m² = 1.248,61 ft²
  • 117 m² = 1.259,38 ft²
  • 118 m² = 1.270,14 ft²
  • 119 m² = 1.280,91 ft²
  • 120 m² = 1.291,67 ft²
  • 121 m² = 1.302,43 ft²
  • 122 m² = 1.313,2 ft²
  • 123 m² = 1.323,96 ft²
  • 124 m² = 1.334,72 ft²
  • 125 m² = 1.345,49 ft²
  • 126 m² = 1.356,25 ft²
  • 127 m² = 1.367,02 ft²
  • 128 m² = 1.377,78 ft²
  • 129 m² = 1.388,54 ft²
  • 130 m² = 1.399,31 ft²
  • 131 m² = 1.410,07 ft²
  • 132 m² = 1.420,84 ft²
  • 133 m² = 1.431,6 ft²
  • 134 m² = 1.442,36 ft²
  • 135 m² = 1.453,13 ft²
  • 136 m² = 1.463,89 ft²
  • 137 m² = 1.474,66 ft²
  • 138 m² = 1.485,42 ft²
  • 139 m² = 1.496,18 ft²
  • 140 m² = 1.506,95 ft²
  • 141 m² = 1.517,71 ft²
  • 142 m² = 1.528,48 ft²
  • 143 m² = 1.539,24 ft²
  • 144 m² = 1.550 ft²
  • 145 m² = 1.560,77 ft²
  • 146 m² = 1.571,53 ft²
  • 147 m² = 1.582,29 ft²
  • 148 m² = 1.593,06 ft²
  • 149 m² = 1.603,82 ft²
  • 150 m² = 1.614,59 ft²
  • 151 m² = 1.625,35 ft²
  • 152 m² = 1.636,11 ft²
  • 153 m² = 1.646,88 ft²
  • 154 m² = 1.657,64 ft²
  • 155 m² = 1.668,41 ft²
  • 156 m² = 1.679,17 ft²
  • 157 m² = 1.689,93 ft²
  • 158 m² = 1.700,7 ft²
  • 159 m² = 1.711,46 ft²
  • 160 m² = 1.722,23 ft²
  • 161 m² = 1.732,99 ft²
  • 162 m² = 1.743,75 ft²
  • 163 m² = 1.754,52 ft²
  • 164 m² = 1.765,28 ft²
  • 165 m² = 1.776,05 ft²
  • 166 m² = 1.786,81 ft²
  • 167 m² = 1.797,57 ft²
  • 168 m² = 1.808,34 ft²
  • 169 m² = 1.819,1 ft²
  • 170 m² = 1.829,86 ft²
  • 171 m² = 1.840,63 ft²
  • 172 m² = 1.851,39 ft²
  • 173 m² = 1.862,16 ft²
  • 174 m² = 1.872,92 ft²
  • 175 m² = 1.883,68 ft²
  • 176 m² = 1.894,45 ft²
  • 177 m² = 1.905,21 ft²
  • 178 m² = 1.915,98 ft²
  • 179 m² = 1.926,74 ft²
  • 180 m² = 1.937,5 ft²
  • 181 m² = 1.948,27 ft²
  • 182 m² = 1.959,03 ft²
  • 183 m² = 1.969,8 ft²
  • 184 m² = 1.980,56 ft²
  • 185 m² = 1.991,32 ft²
  • 186 m² = 2.002,09 ft²
  • 187 m² = 2.012,85 ft²
  • 188 m² = 2.023,62 ft²
  • 189 m² = 2.034,38 ft²
  • 190 m² = 2.045,14 ft²
  • 191 m² = 2.055,91 ft²
  • 192 m² = 2.066,67 ft²
  • 193 m² = 2.077,43 ft²
  • 194 m² = 2.088,2 ft²
  • 195 m² = 2.098,96 ft²
  • 196 m² = 2.109,73 ft²
  • 197 m² = 2.120,49 ft²
  • 198 m² = 2.131,25 ft²
  • 199 m² = 2.142,02 ft²
  • 200 m² = 2.152,78 ft²
  • 205 m² = 2.206,6 ft²
  • 210 m² = 2.260,42 ft²
  • 215 m² = 2.314,24 ft²
  • 220 m² = 2.368,06 ft²
  • 225 m² = 2.421,88 ft²
  • 230 m² = 2.475,7 ft²
  • 235 m² = 2.529,52 ft²
  • 240 m² = 2.583,34 ft²
  • 245 m² = 2.637,16 ft²
  • 250 m² = 2.690,98 ft²
  • 255 m² = 2.744,8 ft²
  • 260 m² = 2.798,62 ft²
  • 265 m² = 2.852,44 ft²
  • 270 m² = 2.906,26 ft²
  • 275 m² = 2.960,08 ft²
  • 280 m² = 3.013,89 ft²
  • 285 m² = 3.067,71 ft²
  • 290 m² = 3.121,53 ft²
  • 295 m² = 3.175,35 ft²
  • 300 m² = 3.229,17 ft²
  • 305 m² = 3.282,99 ft²
  • 310 m² = 3.336,81 ft²
  • 315 m² = 3.390,63 ft²
  • 320 m² = 3.444,45 ft²
  • 325 m² = 3.498,27 ft²
  • 330 m² = 3.552,09 ft²
  • 335 m² = 3.605,91 ft²
  • 340 m² = 3.659,73 ft²
  • 345 m² = 3.713,55 ft²
  • 350 m² = 3.767,37 ft²
  • 355 m² = 3.821,19 ft²
  • 360 m² = 3.875,01 ft²
  • 365 m² = 3.928,83 ft²
  • 370 m² = 3.982,65 ft²
  • 375 m² = 4.036,47 ft²
  • 380 m² = 4.090,29 ft²
  • 385 m² = 4.144,11 ft²
  • 390 m² = 4.197,93 ft²
  • 395 m² = 4.251,74 ft²
  • 400 m² = 4.305,56 ft²
  • 405 m² = 4.359,38 ft²
  • 410 m² = 4.413,2 ft²
  • 415 m² = 4.467,02 ft²
  • 420 m² = 4.520,84 ft²
  • 425 m² = 4.574,66 ft²
  • 430 m² = 4.628,48 ft²
  • 435 m² = 4.682,3 ft²
  • 440 m² = 4.736,12 ft²
  • 445 m² = 4.789,94 ft²
  • 450 m² = 4.843,76 ft²
  • 455 m² = 4.897,58 ft²
  • 460 m² = 4.951,4 ft²
  • 465 m² = 5.005,22 ft²
  • 470 m² = 5.059,04 ft²
  • 475 m² = 5.112,86 ft²
  • 480 m² = 5.166,68 ft²
  • 485 m² = 5.220,5 ft²
  • 490 m² = 5.274,32 ft²
  • 495 m² = 5.328,14 ft²
  • 500 m² = 5.381,96 ft²
  • 510 m² = 5.489,59 ft²
  • 520 m² = 5.597,23 ft²
  • 530 m² = 5.704,87 ft²
  • 540 m² = 5.812,51 ft²
  • 550 m² = 5.920,15 ft²
  • 560 m² = 6.027,79 ft²
  • 570 m² = 6.135,43 ft²
  • 580 m² = 6.243,07 ft²
  • 590 m² = 6.350,71 ft²
  • 600 m² = 6.458,35 ft²
  • 610 m² = 6.565,99 ft²
  • 620 m² = 6.673,62 ft²
  • 630 m² = 6.781,26 ft²
  • 640 m² = 6.888,9 ft²
  • 650 m² = 6.996,54 ft²
  • 660 m² = 7.104,18 ft²
  • 670 m² = 7.211,82 ft²
  • 680 m² = 7.319,46 ft²
  • 690 m² = 7.427,1 ft²
  • 700 m² = 7.534,74 ft²
  • 710 m² = 7.642,38 ft²
  • 720 m² = 7.750,02 ft²
  • 730 m² = 7.857,65 ft²
  • 740 m² = 7.965,29 ft²
  • 750 m² = 8.072,93 ft²
  • 760 m² = 8.180,57 ft²
  • 770 m² = 8.288,21 ft²
  • 780 m² = 8.395,85 ft²
  • 790 m² = 8.503,49 ft²
  • 800 m² = 8.611,13 ft²
  • 810 m² = 8.718,77 ft²
  • 820 m² = 8.826,41 ft²
  • 830 m² = 8.934,05 ft²
  • 840 m² = 9.041,68 ft²
  • 850 m² = 9.149,32 ft²
  • 860 m² = 9.256,96 ft²
  • 870 m² = 9.364,6 ft²
  • 880 m² = 9.472,24 ft²
  • 890 m² = 9.579,88 ft²
  • 900 m² = 9.687,52 ft²
  • 910 m² = 9.795,16 ft²
  • 920 m² = 9.902,8 ft²
  • 930 m² = 10.010,44 ft²
  • 940 m² = 10.118,08 ft²
  • 950 m² = 10.225,71 ft²
  • 960 m² = 10.333,35 ft²
  • 970 m² = 10.440,99 ft²
  • 980 m² = 10.548,63 ft²
  • 990 m² = 10.656,27 ft²
  • 1.000 m² = 10.763,91 ft²
  • 1.025 m² = 11.033,01 ft²
  • 1.050 m² = 11.302,11 ft²
  • 1.075 m² = 11.571,2 ft²
  • 1.100 m² = 11.840,3 ft²
  • 1.125 m² = 12.109,4 ft²
  • 1.150 m² = 12.378,5 ft²
  • 1.175 m² = 12.647,59 ft²
  • 1.200 m² = 12.916,69 ft²
  • 1.225 m² = 13.185,79 ft²
  • 1.250 m² = 13.454,89 ft²
  • 1.275 m² = 13.723,99 ft²
  • 1.300 m² = 13.993,08 ft²
  • 1.325 m² = 14.262,18 ft²
  • 1.350 m² = 14.531,28 ft²
  • 1.375 m² = 14.800,38 ft²
  • 1.400 m² = 15.069,47 ft²
  • 1.425 m² = 15.338,57 ft²
  • 1.450 m² = 15.607,67 ft²
  • 1.475 m² = 15.876,77 ft²
  • 1.500 m² = 16.145,87 ft²
  • 1.525 m² = 16.414,96 ft²
  • 1.550 m² = 16.684,06 ft²
  • 1.575 m² = 16.953,16 ft²
  • 1.600 m² = 17.222,26 ft²
  • 1.625 m² = 17.491,35 ft²
  • 1.650 m² = 17.760,45 ft²
  • 1.675 m² = 18.029,55 ft²
  • 1.700 m² = 18.298,65 ft²
  • 1.725 m² = 18.567,75 ft²
  • 1.750 m² = 18.836,84 ft²
  • 1.775 m² = 19.105,94 ft²
  • 1.800 m² = 19.375,04 ft²
  • 1.825 m² = 19.644,14 ft²
  • 1.850 m² = 19.913,23 ft²
  • 1.875 m² = 20.182,33 ft²
  • 1.900 m² = 20.451,43 ft²
  • 1.925 m² = 20.720,53 ft²
  • 1.950 m² = 20.989,63 ft²
  • 1.975 m² = 21.258,72 ft²
  • 2.000 m² = 21.527,82 ft²
  • 2.050 m² = 22.066,02 ft²
  • 2.100 m² = 22.604,21 ft²
  • 2.150 m² = 23.142,41 ft²
  • 2.200 m² = 23.680,6 ft²
  • 2.250 m² = 24.218,8 ft²
  • 2.300 m² = 24.756,99 ft²
  • 2.350 m² = 25.295,19 ft²
  • 2.400 m² = 25.833,39 ft²
  • 2.450 m² = 26.371,58 ft²
  • 2.500 m² = 26.909,78 ft²
  • 2.550 m² = 27.447,97 ft²
  • 2.600 m² = 27.986,17 ft²
  • 2.650 m² = 28.524,36 ft²
  • 2.700 m² = 29.062,56 ft²
  • 2.750 m² = 29.600,75 ft²
  • 2.800 m² = 30.138,95 ft²
  • 2.850 m² = 30.677,14 ft²
  • 2.900 m² = 31.215,34 ft²
  • 2.950 m² = 31.753,54 ft²
  • 3.000 m² = 32.291,73 ft²
  • 3.050 m² = 32.829,93 ft²
  • 3.100 m² = 33.368,12 ft²
  • 3.150 m² = 33.906,32 ft²
  • 3.200 m² = 34.444,51 ft²
  • 3.250 m² = 34.982,71 ft²
  • 3.300 m² = 35.520,9 ft²
  • 3.350 m² = 36.059,1 ft²
  • 3.400 m² = 36.597,3 ft²
  • 3.450 m² = 37.135,49 ft²
  • 3.500 m² = 37.673,69 ft²
  • 3.550 m² = 38.211,88 ft²
  • 3.600 m² = 38.750,08 ft²
  • 3.650 m² = 39.288,27 ft²
  • 3.700 m² = 39.826,47 ft²
  • 3.750 m² = 40.364,66 ft²
  • 3.800 m² = 40.902,86 ft²
  • 3.850 m² = 41.441,06 ft²
  • 3.900 m² = 41.979,25 ft²
  • 3.950 m² = 42.517,45 ft²
  • 4.000 m² = 43.055,64 ft²
  • 4.050 m² = 43.593,84 ft²
  • 4.100 m² = 44.132,03 ft²
  • 4.150 m² = 44.670,23 ft²
  • 4.200 m² = 45.208,42 ft²
  • 4.250 m² = 45.746,62 ft²
  • 4.300 m² = 46.284,81 ft²
  • 4.350 m² = 46.823,01 ft²
  • 4.400 m² = 47.361,21 ft²
  • 4.450 m² = 47.899,4 ft²
  • 4.500 m² = 48.437,6 ft²
  • 4.550 m² = 48.975,79 ft²
  • 4.600 m² = 49.513,99 ft²
  • 4.650 m² = 50.052,18 ft²
  • 4.700 m² = 50.590,38 ft²
  • 4.750 m² = 51.128,57 ft²
  • 4.800 m² = 51.666,77 ft²
  • 4.850 m² = 52.204,97 ft²
  • 4.900 m² = 52.743,16 ft²
  • 4.950 m² = 53.281,36 ft²
  • 5.000 m² = 53.819,55 ft²
  • 5.100 m² = 54.895,94 ft²
  • 5.200 m² = 55.972,33 ft²
  • 5.300 m² = 57.048,73 ft²
  • 5.400 m² = 58.125,12 ft²
  • 5.500 m² = 59.201,51 ft²
  • 5.600 m² = 60.277,9 ft²
  • 5.700 m² = 61.354,29 ft²
  • 5.800 m² = 62.430,68 ft²
  • 5.900 m² = 63.507,07 ft²
  • 6.000 m² = 64.583,46 ft²
  • 6.100 m² = 65.659,85 ft²
  • 6.200 m² = 66.736,24 ft²
  • 6.300 m² = 67.812,64 ft²
  • 6.400 m² = 68.889,03 ft²
  • 6.500 m² = 69.965,42 ft²
  • 6.600 m² = 71.041,81 ft²
  • 6.700 m² = 72.118,2 ft²
  • 6.800 m² = 73.194,59 ft²
  • 6.900 m² = 74.270,98 ft²
  • 7.000 m² = 75.347,37 ft²
  • 7.100 m² = 76.423,76 ft²
  • 7.200 m² = 77.500,16 ft²
  • 7.300 m² = 78.576,55 ft²
  • 7.400 m² = 79.652,94 ft²
  • 7.500 m² = 80.729,33 ft²
  • 7.600 m² = 81.805,72 ft²
  • 7.700 m² = 82.882,11 ft²
  • 7.800 m² = 83.958,5 ft²
  • 7.900 m² = 85.034,89 ft²
  • 8.000 m² = 86.111,28 ft²
  • 8.100 m² = 87.187,67 ft²
  • 8.200 m² = 88.264,07 ft²
  • 8.300 m² = 89.340,46 ft²
  • 8.400 m² = 90.416,85 ft²
  • 8.500 m² = 91.493,24 ft²
  • 8.600 m² = 92.569,63 ft²
  • 8.700 m² = 93.646,02 ft²
  • 8.800 m² = 94.722,41 ft²
  • 8.900 m² = 95.798,8 ft²
  • 9.000 m² = 96.875,19 ft²
  • 9.100 m² = 97.951,58 ft²
  • 9.200 m² = 99.027,98 ft²
  • 9.300 m² = 100.104,37 ft²
  • 9.400 m² = 101.180,76 ft²
  • 9.500 m² = 102.257,15 ft²
  • 9.600 m² = 103.333,54 ft²
  • 9.700 m² = 104.409,93 ft²
  • 9.800 m² = 105.486,32 ft²
  • 9.900 m² = 106.562,71 ft²
  • 10.000 m² = 107.639,1 ft²

De factor volgt uit de internationale voet (precies 0,3048 m): 1 m² = (1/0,3048)² = 10,7639 sq ft. Methode en bronnen.

Veelgestelde vragen

Hoeveel vierkante voet is 1 m²?

Eén vierkante meter is 10,76 vierkante voet. De factor is het kwadraat van de lengtefactor: een meter is 3,28 voet, dus een vierkant van één meter meet 3,28 × 3,28 ≈ 10,76 vierkante voet.

Hoe groot is een Amerikaanse woning van 1000 sq ft?

1000 vierkante voet is 93 m², naar Europese maatstaven een comfortabel appartement met twee of drie kamers. Amerikaanse en Canadese advertenties tonen alleen sq ft: deel door 10,76 om te vergelijken.

Waarom rekenen oppervlakten met het kwadraat van de factor om?

Omdat een oppervlakte twee dimensies heeft: elke meter lengte ÉN elke meter breedte wordt 3,28 voet. De klassieke fout is met 3,28 vermenigvuldigen in plaats van met 10,76, wat de oppervlakte drie keer te klein maakt.

Hoe groot is een kamer van zes tatami?

Tussen 9,29 en 10,94 m², afhankelijk van de streek, voor dezelfde advertentie. De tatami van Kyoto, kyoma genoemd, is 1,824 m²; die van Nagoya, chukyoma, 1,656; die van Tokio, edoma, 1,548. Zes tatami beslaan dus 10,94 m² in Kansai en 9,29 in Kanto, bijna 18% uiteen. De tsubo daarentegen ligt vast op 3,306 m², twee standaardtatami.

Zit de muur in een opgegeven woonoppervlakte?

Dat hangt van het land af, en daar zit de echte valkuil bij het vergelijken. De Franse wet-Carrez meet de privéoppervlakte zonder muren, scheidingswanden en trappen, en laat alles onder 1,80 m hoogte weg. Andere markten geven de bruto-oppervlakte op, muren inbegrepen. Hetzelfde appartement kan 10% winnen door alleen van definitie te veranderen, zonder dat er enige omrekening aan te pas komt.

Verwante omrekeningen