How accurate are free online IQ tests?

I took one online for free and said I had an IQ of 139, which is considered very superior
I took a different IQ test that I had to pay for, and it said I had an IQ of 110, which is in the high average range, but I was also really tired when I took it

I consider myself pretty smart but I wouldn't consider myself gifted

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quitwhendone · M

120 is gifted. 140 is genius. You're pretty smart.

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quitwhendone · M

@Aardvark97

[b]IQ Scores & Ratings[/b]
Over 140 - Genius or near genius
120 - 140 - Very superior intelligence
110 - 119 - Superior intelligence
90 - 109 - Normal or average intelligence
80 - 89 - Dullness
70 - 79 - Borderline deficiency
Under 70 - Definite feeble-mindedness

[b]Low IQ & Mental Retardation[/b]
5% of people have an IQ under 70 and this is generally considered as the benchmark for "mental retardation", a condition of limited mental ability in that it produces difficulty in adapting to the demands of life.

Severity of mental retardation can be broken into 4 levels:

50-70 - Mild mental retardation (85%)
35-50 - Moderate mental retardation (10%)
20-35 - Severe mental retardation (4%)
IQ < 20 - Profound mental retardation (1%)

[b]High IQ & Genius IQ[/b]
Genius IQ is generally considered to begin around 140 to 145, representing ~.25% of the population (1 in 400). Here's a rough guide:

115-124 - Above average (e.g., university students)
125-134 - Gifted (e.g., post-graduate students)
135-144 - Highly gifted (e.g., intellectuals)
145-154 - Genius (e.g., professors)
155-164 - Genius (e.g., Nobel Prize winners)
165-179 - High genius
180-200 - Highest genius
>200 - "Unmeasurable genius"