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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BlueVeins · 22-25

Online IQ tests are trash. If you want an IQ, I'd say just pay for one like you did, and try to arrive in a better condition. Personally though, I don't think it's a great idea anyway. Assigning a number to your innate intelligence is unproductive outside of some very specific medical circumstances, and it's bad for your self image. Value your efforts, value your skills, and value your personal characteristics.

SW-User

@BlueVeins there's also different types of intelligence that just can't be determined by an IQ test