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It's big very big. I feel that this is akin to 'counting how many angles can dance on the head of a pin'. The universe is expanding all the time, so it cannot have a finite dimension. If the expansion theory is held, conversely if it is expanding then it contracts back to a singularity, still we can't measure it's size. Because any measurement that we obtain will not be viable when we finish the measurement, the universe will have contracted further. In that case we could get a measurement but it would have to be at the Nano second the expansion changes to contraction. Not likely to happen. So let us suffice to say it's big very big.
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