What this BAH calculator does
Type the ZIP code of your duty station, pick your grade, and you'll see the monthly rate for your Military Housing Area — the same figure your LES shows. Because rates are published per MHA rather than per city, the ZIP of the installation itself is the most reliable input; a ZIP twenty minutes away can sit in a different housing area.
BAH versus per diem on TDY
BAH keeps paying at your home station while you're TDY. Lodging away from home is reimbursed separately through per diem, up to the locality lodging rate. Run those numbers in the per diem calculator, then compare against a furnished crashpad near your base.
Using BAH to buy a house
Many of our long-course guests house-hunt from a crashpad and buy with a VA loan before graduation. Lenders count BAH as qualifying income; check what your allowance supports with the home affordability calculator and price a specific house in the VA loan calculator.