Columnar ledger paper, Legal size
Four money columns on Legal-size paper, three extra inches of height, which is roughly nine more entry rows before you have to carry a total forward.
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Why accounting settled on the long sheet
Legal paper persists in accounting and law for a practical reason: a schedule that fits on one page needs no carry-forward line, and every carry-forward is a place where a transcription error can enter and then propagate silently down the rest of the schedule. Three extra inches is about nine more rows at this line spacing. That is often the difference between a one-page trial balance and a two-page one.
Four columns, and what they usually hold
The conventional four-column layout runs description, then debit, credit, and balance, enough for a running account without the sheet becoming unreadably narrow. If you need more analysis columns, the six-column sheet trades description width for them, and the generator will go further if you need it. Below about 25 mm per money column the cents divider stops being usable, which is the practical floor.
Feeding Legal through a home printer
Most home printers accept Legal but do not select it automatically, and the failure mode is the driver silently scaling a 14-inch page onto a 11-inch sheet, which crushes the ruling and makes the columns narrower than the figures you want to write in them. Set the paper size explicitly in the print dialog, load the tray, and check the first sheet against a ruler. Manual feed is more reliable than the main tray on many machines for the longer stock.
Printing it accurately
This only measures correctly if your printer doesn't rescale the page. In the print dialog set Scale: 100%, not "Fit to page" or "Shrink oversized pages". If you're not sure it worked, print the calibration page, measure the ruler on it with a real ruler, and it will tell you exactly what your printer is doing to the page.