KokoroFlow calculator
Estimate a monthly principal and interest payment for a home loan.
Estimate monthly principal and interest, total interest, and the effect of extra payments.
This calculator estimates principal and interest only. It does not include property tax, homeowners insurance, HOA fees, mortgage insurance, or closing costs.
Use this as a quick planning estimate, not as financial advice.
It estimates a monthly principal-and-interest payment from a home price, down payment, interest rate, and loan term, and shows how an extra monthly payment toward principal could shorten the payoff timeline and reduce total interest. It gives a quick planning figure before you talk to a lender.
A $400,000 home with an $80,000 down payment (a $320,000 loan) at 6.75% APR over 30 years comes to a scheduled principal-and-interest payment of about $2,075.51 a month, with roughly $427,000 in total interest paid over the full term. Adding even $200 extra toward principal each month can meaningfully shorten the payoff timeline and reduce total interest paid — the calculator's extra-payment field shows this effect directly.
No. This calculator estimates principal and interest only. Property tax, homeowners insurance, HOA fees, and mortgage insurance (PMI) are separate costs that typically get added to a full monthly housing payment.
Extra principal payments reduce the loan balance faster, which reduces the interest that accrues on it going forward. Even a modest consistent extra payment can shave years off a 30-year term and save a meaningful amount in total interest.
Not necessarily — many loan programs allow smaller down payments, though a down payment below 20% often triggers private mortgage insurance (PMI), which is not included in this estimate.
Yes — try 15 years versus 30 years at the same rate to compare the monthly payment against total interest paid, which is a common trade-off when choosing a mortgage term.