How to get screen width without (minus) scrollbar?

.prop("clientWidth") and .prop("scrollWidth")

var actualInnerWidth = $("body").prop("clientWidth"); // El. width minus scrollbar width
var actualInnerWidth = $("body").prop("scrollWidth"); // El. width minus scrollbar width

in JavaScript:

var actualInnerWidth = document.body.clientWidth;     // El. width minus scrollbar width
var actualInnerWidth = document.body.scrollWidth;     // El. width minus scrollbar width

_{P.S: Note that to use scrollWidth reliably your element should not overflow horizontally}

jsBin demo

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You could also use .innerWidth() but this will work only on the body element

var innerWidth = $('body').innerWidth(); // Width PX minus scrollbar