When someone asks "How big is an acre?" they usually think about it in terms of measurement. But what is it in real-world ...

The 'Palm Beach acre' is 40,000 square feet and used to measure density in town. Officials say it's time to switch to a conventional acre.

Coming in at 1.5 million acre-feet a year, that vast quantity of water is better understood in acre-feet, rather than more than 488 billion gallons. To calculate how many gallons are in an acre ...