You may find my iPhone app, Gauge Trainer, useful as a practical tool to train one's skills in estimating and gauging the size of card piles.

https://itunes.apple.com/de/app/gauge-tr......929?mt=8

The app is straightforward and serves as a virtual spectator who cuts a deck into piles, and your challenge is to estimate their sizes. Knowing the total number of cards, the app aims at increasing your aguility in gauging the relative sizes and estimating the number of cards in eath pile. Gauge Trainer is another first-of-its-kind in the yeahgic series that dedicates to technical learning tools for close-up magicians.

Does it really improve your estimation skills when facing a real deck? It certainly increases your aguility in estimating relative pile sizes, processing the numbers, and it gets you into the habit. You will find yourself much better prepared for the real challenge when having to gauge the size of a true pile.

... what otherwise would take you at least 52 seconds comes at the swipe of the screen: the resolution of the piles’ sizes. There are two categories of apps popular in card magic: Apps that integrate with the performance and enable effects which otherwise, eventually, were not doable, and those, like Gauge Trainer, that serve to grow your skillsets and inherent capabilities to make you faster and complete.