The annual LQA rate is divided by the number of days in the calendar year to obtain a daily rate and then multiplied by 14 to obtain a biweekly rate. Yes - but family size is only one factor. LQA rates are established based on 'quarters groups'. A DoD civilian employee who is a GS-12 falls into LQA group 3. LQA rates are set by DoS for Government civilians assigned to foreign locations.
DoS uses actual reported cost data to set quarters allowances.
For specific locality rates information please see the DoS 'Section 920' web page. Before you go to the website, read the rest of this for the directions as to how to use it. SR number is NOT underlined it hasn't been published. Select the country for which you would like LQA rate information. Each page contains multiple country listings.