This UK mortgage payment calculator helps you estimate your monthly mortgage repayments, total interest paid, and overall cost of your mortgage — using a few simple inputs.
It’s designed to give you clarity before speaking to a lender or broker, so you can plan with confidence.
What This Mortgage Calculator Does
This tool estimates your monthly mortgage payment based on standard UK repayment mortgage calculations.
By entering your property price, deposit, interest rate, and mortgage term, you can see:
- Your estimated monthly mortgage repayment
- Your loan-to-value (LTV) percentage
- The total amount repaid over the mortgage term
- The total interest paid if the mortgage runs for the full term
It’s a practical way to sense-check affordability and understand how different rates, deposits, and terms affect your payments.
How the Mortgage Payment Is Calculated
The calculator uses a standard repayment mortgage amortisation formula, which assumes:
- Monthly repayments
- A fixed interest rate for the full term
- Capital and interest repayments included
This mirrors how most UK repayment mortgages work and gives a realistic estimate for planning purposes.
What Inputs You’ll Need
To use the calculator, you’ll enter:
- Property price – the purchase price of the home
- Deposit – your upfront contribution
- Interest rate – your expected annual mortgage rate
- Mortgage term – the length of the mortgage in years
From this, the calculator automatically works out:
- Mortgage amount
- Loan-to-Value (LTV)
These figures are important because LTV often affects the interest rates lenders offer.
Why Monthly Payments Matter More Than You Think
Many people focus on the house price but underestimate how much interest and time impact the real cost of a mortgage.
Even small changes in:
- Interest rate
- Mortgage term
- Deposit size
can significantly change your monthly payment and total interest paid.
Using a mortgage calculator early helps you:
- Avoid overstretching your budget
- Compare different scenarios
- Plan for future rate changes
- Feel more confident before applying
Is This Mortgage Calculator Accurate?
This calculator provides estimates, not personalised mortgage offers.
Actual mortgage payments may differ depending on:
- Lender criteria
- Fees and incentives
- Rate changes
- Remortgaging or overpayments
It’s best used as a planning tool, alongside advice from a qualified mortgage adviser or lender.
Use the Mortgage Calculator Below
Enter your details below to estimate your monthly mortgage payment and see the long-term cost of your mortgage.
Adjust the numbers to explore different scenarios and understand what works best for your finances.