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Base Rate Calculator

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Written by  Beth Leslie
Updated: 10 Sep 2025

Use our calculator find out how your mortgage repayments will be affected by changes to the Bank of England Bank Rate.

How to use the base rate calculator

  1. Enter your mortgage type, whether it is a repayment mortgage, or interest only

  2. Enter your current mortgage balance and the number of years you have left

  3. Input your current mortgage interest rate, along with a a new interest rate

  4. See how the new interest rate will affect your repayments, as well as how changes to the base rate could affect it too.

How does the base rate affect my mortgage?

If you have a mortgage, any increases to the Bank Rate could affect your monthly mortgage repayments – if you’re on a variable rate, discounted rate or tracker rate mortgage.

Borrowers in fixed rate mortgage deals won’t be affected by changes to the Bank Rate.

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Beth Leslie

Senior Insurance Content Editor

Beth is an experienced writer and editor who specialises in financial and economic content. She is currently the Senior Insurance Content Editor for MoneySuperMarket. Beth is passionate about making...

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