IQ percentile calculator

Your IQ percentile is the share of people who score below you on a standard IQ scale where 100 is average. An IQ of 100 is the 50th percentile, 115 is about the 84th, and 130 is about the 98th. Enter your score below for its exact percentile and rarity.

Enter a score, pick the scale it was measured on, and the answer updates as you type. Everything runs in your own browser: your score is never sent anywhere.

Why the scale matters: tests set their spread differently, so the same ability earns a different number on each scale. A top-2% performance is about 131 on an SD 15 test, about 133 on an SD 16 test and about 149 on a Cattell (SD 24) test. Scores are only comparable within the same scale, which is why Mensa's requirement is quoted per scale rather than as one magic number.

A note on our own test: Free IQ Test Lab's test reports scores from 55 to 145, so it will never hand you a number above 145. The higher scores in this calculator are simply the maths of the standard scale. Short online tests, ours included, cannot measure that high reliably. Read very high figures as approximations, not measurements.

IQ score to percentile chart

The full table for the standard scale (average 100, SD 15), the same scale behind the average IQ of 100 and the bands in our IQ score chart. Every score from 70 to 160 has its own row, plus a few lower ones, and you can link straight to one: add a score to the address, like /iq-percentile-calculator/#115.

IQ score	Percentile	Scored higher than (of 100 people)	Rarity: about 1 in N (this high or higher at 100 and above; this low or lower below 100)
55	0.1	0.1	741
60	0.4	0.4	261
65	1st	1	102
70	2nd	2	44
71	3rd	3	38
72	3rd	3	32
73	4th	4	28
74	4th	4	24
75	5th	5	21
76	5th	5	18
77	6th	6	16
78	7th	7	14
79	8th	8	12
80	9th	9	11
81	10th	10	10
82	12th	12	9
83	13th	13	8
84	14th	14	7
85	16th	16	6
86	18th	18	6
87	19th	19	5
88	21st	21	5
89	23rd	23	4
90	25th	25	4
91	27th	27	4
92	30th	30	3
93	32nd	32	3
94	34th	34	3
95	37th	37	3
96	39th	39	3
97	42nd	42	2
98	45th	45	2
99	47th	47	2
100	50th	50	2
101	53rd	53	2
102	55th	55	2
103	58th	58	2
104	61st	61	3
105	63rd	63	3
106	66th	66	3
107	68th	68	3
108	70th	70	3
109	73rd	73	4
110	75th	75	4
111	77th	77	4
112	79th	79	5
113	81st	81	5
114	82nd	82	6
115	84th	84	6
116	86th	86	7
117	87th	87	8
118	88th	88	9
119	90th	90	10
120	91st	91	11
121	92nd	92	12
122	93rd	93	14
123	94th	94	16
124	95th	95	18
125	95th	95	21
126	96th	96	24
127	96th	96	28
128	97th	97	32
129	97th	97	38
130	98th	98	44
131	98th	98	52
132	98th	98	61
133	99th	99	72
134	99th	99	85
135	99th	99	102
136	99th	99	122
137	99th	99	147
138	99th	99	177
139	99.5	99.5	215
140	99.6th	99.6	261
141	99.7	99.7	319
142	99.7	99.7	391
143	99.8	99.8	482
144	99.8	99.8	596
145	99.9th	99.9	741
146	99.9	99.9	924
147	99.91	99.91	1,157
148	99.93	99.93	1,455
149	99.95	99.95	1,838
150	99.96	99.96	2,330
151	99.97	99.97	2,968
152	99.97	99.97	3,795
153	99.98	99.98	4,873
154	99.98	99.98	6,284
155	99.99	99.99	8,137
156	99.99	99.99	10,581
157	99.99	99.99	13,817
158	99.99	99.99	18,120
159	99.996	99.996	23,863
160	99.997	99.997	31,560

Rarity is how many people the mathematics of the bell curve expects at that level: for a score of 100 or above, that high or higher; for a score below 100, that low or lower. Treat the extreme rows as approximations: real tests are standardised on samples of a few thousand people, so percentiles out there rest on the curve itself, not on headcounts.

How the calculator works

IQ scores on standard tests follow a bell curve, the normal distribution. Half of all scores fall within about 10 points of the average, and scores grow rarer the further they sit from 100 in either direction. The calculator first converts your score to a z-score: how many standard deviations it lies from the average. It then reads off the share of the curve below that point. That share, expressed as a percentage, is your percentile.

The conversion assumes the standard scale (average 100, standard deviation 15) unless you pick another scale above. A test with a larger standard deviation stretches the same bell curve wider, which is why its numbers run higher for identical performance, and a test with a smaller one squeezes them lower.

Even two tests on the same scale can place you a few points apart. Each is standardised on a different sample of people, the questions differ, and every score carries a few points of measurement error in either direction. Our methodology page shows how we handle that here. Treat any percentile as a close estimate of where you stand, not an exact rank in a queue.

One more limit, stated plainly: percentiles describe standard IQ scales. Our own test reports an estimate between 55 and 145, read off this same curve so it can be compared with standard scores, but it is a short test taken at home, not a clinical assessment.

Common questions

What percentile is a 130 IQ?

An IQ of 130 is about the 98th percentile (97.7 before rounding): you scored higher than about 98 of every 100 people, and only about 1 person in 44 scores 130 or higher. That is the top 2%, the band the Mensa entry level sits in.

What percentile is 115 IQ?

An IQ of 115 is about the 84th percentile. You scored higher than about 84% of people, and about 1 person in 6 scores 115 or higher. On the usual bands, 115 sits in the above-average range (110–119).

Is percentile the same as percent correct?

No. Percent correct is the share of questions you answered right. Percentile is the share of people who scored below you. On a hard test you might answer 60% of the questions correctly and still land at the 90th percentile, if most people found it harder than you did.

What IQ is the 98th percentile?

About 131 on the standard scale (SD 15). A score of 130 lands just below it, at the 97.7 percentile, which is why the top-2% cut-off is quoted as about 131 on this scale, and as a higher number on scales with a larger standard deviation.

What is the average IQ percentile?

The 50th percentile. The average IQ is 100 by definition, and it sits in the middle of the scale: half of people score below 100 and half above. The whole average band, 90 to 109, spans roughly the 25th to the 73rd percentile.

Don't know your score yet?

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