Mortgage calculator

Estimate fixed-rate repayments with extra payments and a CSV schedule.

Runs on your deviceWorks offline after setupAll Business tools

Related tools

Enter your values, then choose Calculate. Results stay on this device.

Limits
  • 1–600 monthly periods, fixed nominal annual rate (4 decimal places) and end-of-month payments. Interest rounds to cents monthly; the last payment settles any rounding remainder. Taxes, insurance, fees, penalties and variable rates are excluded.
  • Money inputs support 2 decimal places unless stated otherwise. Use one currency consistently. These estimates are not financial, tax or legal advice.
  • Physical phones and real Safari remain unverified.

What happens to your data

Mortgage calculator runs inside this browser tab, and the page's code comes from this site. There is no application server to receive your data, and the site's security policy limits connections to this site.

How local processing works

Good to know

  • 1–600 monthly periods, fixed nominal annual rate (4 decimal places) and end-of-month payments. Interest rounds to cents monthly; the last payment settles any rounding remainder. Taxes, insurance, fees, penalties and variable rates are excluded.
  • Money inputs support 2 decimal places unless stated otherwise. Use one currency consistently. These estimates are not financial, tax or legal advice.
  • Physical phones and real Safari remain unverified.