See the amortization schedule, not just the payment headline.
Track how each mortgage payment splits between principal and interest, and see what extra payments do to the payoff timeline.
See where every payment actually goes
Monthly payment calculators are useful, but amortization is where the shape of the loan becomes real. This page shows how much each month goes to interest, how slowly the balance moves at first, and what extra payments actually buy you.
Even small recurring extra payments usually matter more than people expect because they attack principal early, which reduces future interest compounding.
Most people underestimate how front-loaded interest is
Early in a long mortgage, a surprisingly large share of the payment goes to interest. That is why even modest extra payments can have an outsized effect on the total interest bill.
Use the monthly payment page first, then switch here for the time dimension.
Turn income and debt into a realistic budget band for house shopping.
Focus specifically on early payoff strategies and extra-payment scenarios.