Space requirements on iPhone 5?

How can I tell how much space I need on my iPhone to download and install something? I'm trying to download an 1.31 GB and I can't download it even though I have 2.9 GB free, so if you don't know how to tell how much any app can have, at least tell me how much I need for that one app.

Settings-General-Usage and it gives you the total used and total available at the top. You will need at minimum 25MB of additional storage for the download to go through. And iTunes downloads of that size MUST go through with Wi-Fi. The cellular data can't handle a file of that size.

If it will not download, sync it over using a computer. If this doesn't work either it is a possibility that your queue is blocked (it happens usually with multiple downloads going at the same time or very large apps) and you would have to call Apple to have them clear it.

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