Estimate a complete housing payment
Break out principal and interest, taxes, insurance, mortgage insurance, HOA dues, and modeled lifetime interest.
Mortgage Rate Impact Lab
Understand the mortgage decision behind the number.
Private, transparent calculators turn your assumptions into payment, rate-impact, and payoff comparisons. No account or loan application is required.
Choose the decision you are making
Translate the weekly benchmark into a payment
See the dated national 30-year and 15-year benchmarks, source assumptions, change history, and a local payment estimate.
Compare the impact of two rates
Hold the balance and term constant to see how a note-rate change affects monthly principal and interest.
Model recurring extra principal
Compare modeled payoff timing and interest with and without a recurring extra principal payment.
How the lab works
Useful first. Explainable all the way down.
- Local calculations
- Calculator entries are processed in your browser and are not placed in the page address.
- Visible assumptions
- Each result names what is included, what is excluded, and why a real lender or servicer may differ.
- Auditable methods
- Formulas, primary sources, engineering status, and pending professional review are published plainly.
Trust before traffic
Know exactly what an estimate can and cannot tell you.
Read the calculation methodology, corrections policy, and privacy boundary before relying on any result.