Find out when you can drop private mortgage insurance (PMI). This calculator walks your amortization schedule to find the month your balance reaches 80% of the original price — when you can request cancellation — and 78%, when the lender must automatically end PMI under the federal Homeowners Protection Act. See also the CFPB.
On a conventional loan you can request PMI cancellation once your scheduled balance reaches 80% of the home's original value, and the lender must automatically terminate it at 78%. The federal Homeowners Protection Act sets these rights; the CFPB summarizes them for borrowers.
At 80% loan-to-value you have the right to request cancellation (usually if you are current and have a good payment history). At 78% LTV the servicer must end PMI automatically, based on the original amortization schedule, with no request needed.
Yes — extra principal payments reach the 80% threshold sooner, and a new appraisal showing appreciation may let you cancel earlier under your servicer's rules. This estimate assumes no extra payments and ignores appreciation, so treat it as a baseline.