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Mortgage

Monthly Repayments on a £300,000 Mortgage

An estimate of the monthly repayments on a £300,000 mortgage, using an illustrative interest rate and a 25 year term. These are adjustable example assumptions, not a quote from a lender.

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Adjust the deposit, interest rate and term to get a repayment estimate for your own situation.

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Estimated monthly repayments on a £300,000 mortgage

FigureValue
Mortgage amount£300,000.00
Illustrative interest rate4.5%
Term25 years
Repayment typeRepayment mortgage
Estimated monthly repayment£1,667.50
Total interest over the term£200,249.23
Total repaid over the term£500,249.23

This assumes no deposit

This figure assumes the full £300,000 is borrowed with no deposit, so the mortgage amount equals the property value. A 100% mortgage like this is not typical or recommended for most buyers; it is shown here only because £300,000 is the amount being modelled. Use the full Mortgage Calculator to add your own deposit and see how it changes the monthly repayment.

Interest-only comparison

For reference, an interest-only mortgage at the same amount, rate and term would have a lower monthly payment, but the capital borrowed is not reduced during the term.

FigureValue
Estimated monthly payment (interest only)£1,125.00
Total interest over the term£337,500.00
Capital still owed at the end of the term£300,000.00

How this is calculated

A repayment mortgage is estimated using the standard capital-and-interest amortisation formula, which spreads a fixed monthly payment across the term so the mortgage is fully repaid by the end, assuming the rate stays the same throughout.

The interest rate and term shown here are illustrative assumptions, not a live or guaranteed lender rate. Actual mortgage rates depend on the lender, product, loan-to-value and your own circumstances.

Current Bank of England Bank Rate

Bank of England Bank Rate
Current rate
3.75%
Effective from
18 December 2025

This is shown for context only. It is not a mortgage rate and is not used in the calculation above; mortgage rates are set by individual lenders.

Official source

Frequently asked questions

How much are the monthly repayments on a £300,000 mortgage?
An estimated £1,667.50 a month on a repayment mortgage, assuming a 4.5% illustrative interest rate, a 25 year term, and no deposit. Your actual repayment depends on your own rate, term and deposit.
How much interest would I pay on a £300,000 mortgage?
An estimated £200,249.23 in total interest over 25 years at the assumptions above, meaning a total of £500,249.23 repaid over the full term.
Does this assume I have a deposit?
No. This page assumes the full £300,000 is borrowed with no deposit. Use the full Mortgage Calculator to add your own deposit; a larger deposit reduces the mortgage amount and lowers the monthly repayment.
What would an interest-only £300,000 mortgage cost per month?
An estimated £1,125.00 a month at the same rate and term, but the full £300,000 capital remains owed at the end of the term and must be repaid separately.
Is 4.5% and 25 years a guaranteed rate and term?
No. These are illustrative example assumptions, not a quote or offer from a lender. Actual rates and available terms vary by lender, product and your circumstances.
Does this figure include fees or Stamp Duty?
No. It does not include arrangement, valuation, legal or broker fees, Stamp Duty, insurance or early repayment charges.

Last reviewed

Reviewed

This is an illustrative estimate for general guidance only, using an example interest rate and term. It is not a mortgage offer, an affordability assessment, financial advice or a lending decision. Adjust the figures on the full Mortgage Calculator to model your own circumstances.