Mortgage Repayment Calculator UK
This mortgage repayment calculator helps you estimate your mortgage payments in the UK based on your mortgage balance or planned borrowing, interest rate, remaining term and fees. It is useful if you are buying a home, remortgaging, comparing deals, or checking how much an existing mortgage may cost over the rest of the term.
The calculator gives you a quick estimate of monthly repayments, total interest and total paid, while also letting you compare repayment and interest-only options. If you enter a property price, you can also see your loan-to-value (LTV), which is often important when comparing mortgage deals.
What this calculator includes
- Current mortgage balance or planned borrowing amount
- Interest rate and remaining term in years and months
- Repayment and interest-only mortgage options
- Monthly, weekly, fortnightly and four-weekly payment views
- Mortgage fees paid upfront or added to the loan
- Optional property price to estimate loan-to-value (LTV)
- Total interest and total paid over the remaining term
- Amortisation schedule for repayment mortgages
How the mortgage repayment calculation works
For a repayment mortgage, each payment usually includes both interest and capital, so the balance gradually falls over time until the mortgage is paid off. For an interest-only mortgage, payments usually cover just the interest during the term, which means the original loan balance is still outstanding at the end.
This calculator uses the figures you enter to estimate your payment amount, total interest and overall cost. If you add a product fee to the loan, the borrowing amount increases, which usually raises both your repayments and the total interest paid.
Why your mortgage result may be different
Mortgage calculators are useful for planning, but real mortgage costs can vary depending on lender rules and product details. Your actual result may differ because of:
- The exact way your lender calculates daily or monthly interest
- Introductory fixed, tracker or discount rates changing later in the mortgage term
- Fees, cashback, incentives or early repayment charges
- Overpayments, payment holidays or changes to your term
- Different assumptions around payment dates and compounding
Who this calculator is for
- Home buyers estimating mortgage affordability and monthly costs
- Existing borrowers reviewing repayments on their current mortgage
- People comparing repayment and interest-only options
- Anyone checking whether fees should be paid upfront or added to the mortgage
- Borrowers wanting a quick view of their LTV before remortgaging
Mortgage repayment examples
- £150,000 mortgage over 25 years at 4.5% → useful for estimating a lower-balance home loan
- £250,000 mortgage over 30 years at 5% → useful for checking a mid-range family home mortgage
- £400,000 mortgage over 35 years at 4.75% → useful for seeing how a larger loan changes monthly costs and total interest
These examples are only illustrations. Use the calculator above with your own borrowing amount, term and rate for a more relevant estimate.
Important note
This tool provides estimates only and does not constitute financial, tax or legal advice. Actual mortgage products may use different assumptions, and lender-specific rates, fees and repayment methods can change the final cost.
Use the calculator above to estimate your mortgage repayments and compare how changes to rate, term, fees and repayment type affect the overall cost.