That should be: 1'500'000'000 / (1920 * 1080) ≈ 723.38 Anyway, as you wouldn't want to crop the image you're showing, a more suitable formula would be: N = c

That should be: 1'500'000'000 / (1920 * 1080) ≈ 723.38 Anyway, as you wouldn't want to crop the image you're showing, a more suitable formula would be: N = ceil(image width / 1920) * ceil(image height / 1080) Edit: width = 69536, height = 22230 so N = 37*21 = 777