One gallon of Gentoo covers approximately 665 ft2 (61.8 m2) if there is no waste. At this rate, a complete quart set covers 316 ft2 (29.4 m2), a complete 5-gal set covers 6,330 ft2 (588 m2), and a complete 50-gal set covers 63,300 ft2 (5,880 m2).
There are different ways to apply Gentoo. Depending on which method is chosen, your coverage and waste may vary. Collecting, re-using (and re-filtering) will help achieve maximum coverage and reduce waste.