Home & Mortgage
Mortgage Prepayment Calculator
See how extra monthly payments or a lump sum could reduce modeled interest and shorten your mortgage payoff timeline.
Quick mode
Start with the few inputs that usually move the answer most. MFA keeps transparent defaults for the rest until you open them.
Mortgage-rate context · Latest source refresh
Freddie Mac national mortgage benchmarks
PMMS national averages are market context, not a personalized lender quote or intraday rate. Use an actual Loan Estimate when you have one.
Observation: 2026-10-22
Observation: 2026-10-22
Prepayment math continues to use your entered loan rate. These benchmarks are shown only so you can see whether a separate refinance comparison may be worth testing.
Use the actual remaining term when known—for example, 27 years rather than rounding to a preset.
Time Saved
0 mo
Interest Saved
$0
New Payoff Date
October 2056
Total Interest
$446,406
Balance path
See how extra principal changes the payoff curve
No-extra baseline vs. your entered prepayment plan
- No Extra Payment
- With Extra Payment
3 · Save only what matters
Keep the result or send the scenario.
Run the math first without an account. If this result is useful, save it to My MFA so you can reopen it instead of rebuilding the scenario.
Turn this result into a decision.
Compare it with another snapshot, keep your reasoning and set your next step.
Inputs, estimates & source dates
Keep this result
Save it to My MFA and come back later.
This keeps the scenario in your private My MFA workspace so you can reopen, compare and organize it. It does not publish the scenario.
Share or export
Send the scenario, copy a rerunnable link, or export a branded file.
Sharing is separate from saving to My MFA. Public links carry only the scenario inputs needed to reproduce this view.
PNG and PDF use the same high-resolution MFA export layout with result context and assumptions. On iPhone, Save PNG can open the iOS share sheet. MyFriendAlex.org is the full experience · MFA.Money is the short address.
Go deeper in Excel
Home Buying Decision Model
Mortgage, closing costs, property tax, maintenance, opportunity cost and rent-vs-buy scenarios. The workbook is being built as a reusable companion to MFA's free web tools.
Planned workbook: Mortgage model · true cost · rent vs buy · scenario table.
Understand the result
Extra Mortgage Payments vs Investing
Read the plain-English guide, common mistakes and context behind this calculation.
Keep going
Related next steps
Home & Mortgage
Mortgage Payment Calculator
Model a mortgage payment, add principal prepayments, and compare two lender quotes side by side including discount points, seller credits, cash to close, break-even timing, and financing cost over your expected holding period.
OpenHome & Mortgage
Refinance Calculator
Compare your current mortgage with a refinance scenario, including monthly payment, break-even timing, and modeled lifetime interest.
OpenHome & Mortgage
Rent vs Buy Calculator
Compare renting vs buying through decision-linked wealth, including equity, appreciation, maintenance, transaction costs, and invested cash.
OpenRelated MFA experience
Compare a home decision
Educational estimates only. Not financial, tax, investment, legal, payroll, mortgage, or insurance advice. Results may vary based on rates, tax rules, lender terms, state laws, and personal circumstances. Financial values entered into supported calculators may be stored privately with technical data such as IP address for MFA analytics, security, debugging and product improvement. Do not enter account numbers, passwords, Social Security numbers or login credentials. Privacy details.