FedRate
US interest rates and mortgage calculator
US interest rates
3.63%Fed funds · September 11, 2026
Source: Federal Reserve Bank of St. Louis (FRED) — DFF, MORTGAGE30US, MORTGAGE15US.
Mortgage and loan calculator
$2,337.35Estimated monthly payment
Lifetime cost$841,445
Principal$360,000Interest$481,445
57% of everything you pay is interest.
- Loan amount
- $360,000
- Down payment
- 20.0%
- Total interest
- $481,445
- Total of 360 payments
- $841,445
- Paid off
- Sep 2056
An estimate: escrow amounts vary by county and insurer, and PMI is shown at the current balance until 20% equity is reached.
Where each payment goes
The payment stays flat at $2,337.35; the split between interest and principal is what moves.
- Interest
- Principal
Common questions
- How is a monthly mortgage payment calculated?
- The principal and interest come from the standard amortising formula, M = P × r / (1 − (1 + r)^−n), where P is the amount financed, r is the annual rate divided by twelve, and n is the number of monthly payments. The mortgage calculator then adds property tax, home insurance, HOA dues and any mortgage insurance to reach the figure you would actually pay each month.
- Can I use it as a loan calculator for something other than a house?
- Yes. The amortisation maths is the same for any fixed-rate loan, so entering the amount borrowed, the rate and the term gives a correct monthly payment and payoff schedule. The extra fields — down payment, property tax, insurance, HOA and mortgage insurance — are specific to a mortgage, so leave them at zero when using it as a general loan calculator.
- Does it work as a refinance calculator?
- Switching the calculator to Refinance mode compares your existing loan against a new one. It works out how much of the current term is left from the original loan amount and today's balance, then sets the new payment beside the old one so a lower monthly payment over a longer term does not read as a saving when it is not.
- Where do the mortgage rates come from?
- The 30- and 15-year fixed mortgage rates are Freddie Mac's Primary Mortgage Market Survey averages, published weekly, and the federal funds effective rate is published daily by the Federal Reserve. Both are retrieved from FRED at the Federal Reserve Bank of St. Louis. They are national averages, not a quote for your situation.