Guide · Mortgage

How to use a mortgage calculator

Educational guide · Updated · About 6 min read

John Rey Balais, developer of Nestfigure Written & maintained by John Rey Balais Developer · Nestfigure
  1. Enter home price and down payment (dollars or percent).
  2. Enter an interest rate you want to model (not a live quote).
  3. Choose term years (or use 15/20/30 presets).
  4. Optional: add monthly tax, insurance, or HOA amounts.
  5. Read P&I, total housing, interest, term compare, and schedule.

Example: $400,000 · 20% down · 6.5% · 30 years

What it is not

  • Not a pre-approval or rate lock
  • Not automatic PMI
  • Not closing-cost software

How we calculate · Questions

Frequently asked questions

What inputs do I need?

Home price, down payment, interest rate, term in years, and optional monthly tax, insurance, or HOA amounts.

Can I share a prefilled link?

Yes—use price, down, rate, years, tax, insurance, and hoa query parameters.

Related tool

Open the free mortgage calculator

P&I, total interest, term compare, schedule.

Open mortgage calculator

Sources linked above include U.S. government materials (for example CFPB, FDIC, NCUA, BLS, IRS) where noted. Sample math uses only labeled Nestfigure assumptions—not bank quotes, job offers, or personalized advice. Last reviewed: August 9, 2026.

YMYL notice: This site is for education only. It is not financial, tax, or investment advice. Nestfigure is not a bank, credit union, broker, investment adviser, or fiduciary. Product terms, rates, and penalties vary—always read your institution’s disclosures before acting. Calculator results are mathematical estimates, not bank quotes.