Chances are that you won't measure your wine when you pour yourself a casual glass at home. But if you're entertaining guests, knowing how to measure a standard 5-ounce pour will give you an idea of how much your guests are drinking and how many bottles you'll need to last to the end of the party.
Use a measuring cup and fill the cup until the wine reaches the 5-ounce mark. If your measuring cup doesn't have ounces marked and you don't need an exact measurement, pour the wine just shy of 2/3 of a cup. If you do need an exact measurement, pour one 1/2 cup and then add 2 tablespoons. If you do not have a measuring cup, 10 tablespoons equals 5 ounces.
Think Outside the Wine Box
Since pouring 10 tablespoons into multiple wine glasses could take a while, grab one of those large, red plastic cups with the horizontal lines. Fill the wine to the line second from the bottom. If you are not after perfect measurement but can use an approximation, use a shot glass -- these are typically 1 1/2 ounces. Pour three shots of wine into one glass and then add a quick dollop. Use the finger method with a highball glass or tumbler. Wrap your hand around the glass with your ring finger level with the bottom of the glass. Each finger represents 1 ounce.