What vessel to use for baking cheesecake
A 9" pan has a surface area* of 81&pi;/4 square inches. A 6" pan is 36&pi;/4, or just under half, so the depth will be similar (~10% deeper). 6" springform pans are easy to get.  If your existing pan is dead-on 9", you might like a 6 that comes up a little big, as many pans do.  Or you could make a 2/3 quantity in a 7" pan, something I often do with 3-egg recipes.


*The factor of &pi;/4 cancels, so you only need to consider the ratio of the square of the diameters.  In fact, because &pi;/4=0.79&approx;1, you can often ignore it when converting between rectangular and round pans, given that the limited range of sizes available.