UK Mortgage Calculator – Estimate Your Monthly Payments Quickly
Just enter your details below and the tool will calculate your monthly payment, total interest and overall cost of the loan. This is an estimate only, but it’s a helpful first step when planning your budget or comparing mortgage options.
Designed For UK Users
This mortgage calculator is designed for UK property buyers and homeowners. It reflects common UK lending structures, including repayment mortgages with fixed or variable interest rates.
Calculations are based on standard amortisation methods commonly used by UK lenders.
Example Scenario
– Over 25 years, your estimated monthly repayment would be around £1,389 per month.
– Over 35 years, your estimated monthly repayment would be around £1,208 per month.
Over the full term:
– On a 25‑year term, you would repay a lower total amount in interest than on a 35‑year term.
– On a 35‑year term, you would pay more interest overall, but each monthly payment would be smaller.
These figures show how extending the term can reduce the monthly payment while increasing the total amount repaid over time. You can use the calculator to test different terms and see how they affect both your monthly cost and the estimated total repayment, based on the numbers you enter.
Related Guides
Read: How Mortgage Repayments Are Calculated in the UK
Read: How the Bank of England Base Rate Impacts Mortgages and Savings
How the Mortgage Calculator Works
What Affects Your Mortgage Payments?
1. Interest Rate
Even a small rise in interest rates can increase payments noticeably. UK mortgage rates change over time depending on the Bank of England base rate and lender policies.
2. Mortgage Term
A longer mortgage term usually means lower monthly payments, but higher total interest. A shorter term increases the monthly cost but reduces the overall interest paid.
3. Deposit and Loan Size
The amount you borrow directly affects your repayments. Saving a larger deposit can reduce both the loan size and the interest rate available to you.
Repayment vs Interest-Only Mortgages
Repayment mortgage: You repay both the interest and the loan balance every month.
Interest-only mortgage: You repay only the interest each month and pay the loan back separately at the end of the term.
Interest-only mortgages require a repayment plan and are less common for residential buyers.
Why Use a Mortgage Calculator?
Frequently Asked Questions
The results are estimates based on standard UK mortgage formulas. Actual payments may differ depending on lender fees, product type, credit history and personal circumstances. Also, interest rates increase and decrease over time, whilst this calculator works using the interest rate you enter for reference.
No. It calculates repayments only. Arrangement fees, valuation fees or other charges are not included as different UK mortgage lenders may charge in different ways. Always seek professional help before committing to anything.
If you don’t have an exact rate yet, try checking current mortgage rates from UK lenders, comparison sites or compare a few different scenarios to see how payments change. Understanding the differences in monthly repayments and overall interest charged can be really helpful.
The most common UK terms are 25–30 years, but shorter or longer terms are possible. A mortgage adviser or lender can help you choose what suits your situation. Use the calculator to see how longer or shorter terms effects the monthly repayment and interest charged amounts.
Yes, simply enter your remaining mortgage balance instead of a purchase price, and it will estimate your repayments based on a new rate and term. Always seek professional guidance before making any decisions.
Yes. Mortgage structures vary by country, so this calculator is designed specifically for UK repayment mortgages.
About This Calculator
Disclaimer
Last checked/updated February 2026.