What is the equation/rule for making sones into decibels?

i have a chart that says one sone equals 28 decibels but when you increase the sone value, I cant seem to find a pattern/rule (and dont know how to) o

i have a chart that says one sone equals 28 decibels but when you increase the sone value, I can't seem to find a pattern/rule (and don't know how to)

or:i have a chart that says one sone equals 28 decibels but when you increase the sone value, I can't seem to find a pattern/rule (and don't know how to)

Tags:sound,pattern,equations,rules,