IQ score guide

Find a score's meaning, percentile and position on the scale.

Reference scale: mean 100, standard deviation 15. A test's own norms determine its reported percentile.

Normal reference · mean 100 · SD 15

Browse scores 70–160

70–84

70Percentile 2.28 71Percentile 2.66 72Percentile 3.1 73Percentile 3.59 74Percentile 4.15 75Percentile 4.78 76Percentile 5.48 77Percentile 6.26 78Percentile 7.12 79Percentile 8.08 80Percentile 9.12 81Percentile 10.26 82Percentile 11.51 83Percentile 12.85 84Percentile 14.31

85–99

85Percentile 15.87 86Percentile 17.53 87Percentile 19.31 88Percentile 21.19 89Percentile 23.17 90Percentile 25.25 91Percentile 27.43 92Percentile 29.69 93Percentile 32.04 94Percentile 34.46 95Percentile 36.94 96Percentile 39.49 97Percentile 42.07 98Percentile 44.7 99Percentile 47.34

100–114

100Percentile 50 101Percentile 52.66 102Percentile 55.3 103Percentile 57.93 104Percentile 60.51 105Percentile 63.06 106Percentile 65.54 107Percentile 67.96 108Percentile 70.31 109Percentile 72.57 110Percentile 74.75 111Percentile 76.83 112Percentile 78.81 113Percentile 80.69 114Percentile 82.47

115–129

115Percentile 84.13 116Percentile 85.69 117Percentile 87.15 118Percentile 88.49 119Percentile 89.74 120Percentile 90.88 121Percentile 91.92 122Percentile 92.88 123Percentile 93.74 124Percentile 94.52 125Percentile 95.22 126Percentile 95.85 127Percentile 96.41 128Percentile 96.9 129Percentile 97.34

130–144

130Percentile 97.72 131Percentile 98.06 132Percentile 98.36 133Percentile 98.61 134Percentile 98.83 135Percentile 99.02 136Percentile 99.18 137Percentile 99.32 138Percentile 99.44 139Percentile 99.53 140Percentile 99.62 141Percentile 99.69 142Percentile 99.74 143Percentile 99.79 144Percentile 99.83

145–160

145Percentile 99.87 146Percentile 99.89 147Percentile 99.9136 148Percentile 99.9313 149Percentile 99.9456 150Percentile 99.9571 151Percentile 99.9663 152Percentile 99.9737 153Percentile 99.9795 154Percentile 99.9841 155Percentile 99.9877 156Percentile 99.9906 157Percentile 99.9928 158Percentile 99.9945 159Percentile 99.9958 160Percentile 99.9968

What the numbers mean

100 sits at the center of this normal reference distribution. The interval from 85 to 115 covers approximately 68.27% of the model; from 70 to 130 covers about 95.45%. These are scale relationships, not a count of starp visitors.

Each guide includes the calculation, comparisons with nearby values, and how the number relates to starp's scoring. A score describes performance on a particular assessment; it does not define someone's potential.

Calculate a percentile or compare two scores.

Method: NIST's normal-distribution formula. Percentiles here are calculated reference values, not observed starp population ranks. About starp scoring.