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Mr Puggsly said:
Captain_Tom said:

900p is 1600x900 pixels.  It is roughly half the resolution of 1080p.  When someone says "p" they mean that number multiplied by another number that is 16/9 times bigger.  16:9 is the aspect ratio.

That's very rough. Isn't the disaprity closer to 30%?

1080p minus 30%(ish) = 900p, yeah. (900p: 1,440,000px - 1080p: 2073600px). It's usually easier to work upwards though, so 900p + 44% = 1080p.

He might be thinking of 720p. 720p + 125% = 1080p.