To estimate your Pag-IBIG calamity loan amount, you can use the official Pag-IBIG calculator available on their website. This calculator takes into account your contributions and other eligibility criteria. Generally, the loanable amount is based on your total accumulated value and can go up to a certain percentage of that. For the most accurate results and to understand your specific eligibility, it's best to check directly with Pag-IBIG or visit their official site for detailed guidance.