Tons (register) to gallons (US dry) conversion calculator above calculates how many gallons (US dry) are in 'X' tons (register) (where 'X' is the number of tons (register) to convert to gallons (US dry)). In order to convert a value from tons (register) to gallons (US dry) (from RT to gal) type the number of RT to be converted to gal and then click on the 'convert' button.