Precision Utility
UK Mortgage
Calculator
Avg UK Rate
4.62%
Avg UK Price
£268k
Work out your monthly mortgage repayments in seconds. Enter your property price, deposit, interest rate and term — the calculator does the rest. You'll see your monthly payment, total interest paid, loan-to-value ratio and a full year-by-year amortization schedule. Built for UK homebuyers and remortgagers.
Loan Parameters
Estimated Monthly Payment
£1,375.86
Loan Amount
£247,500
Total Interest
£165,258
Loan Amount
£247,500
Total Interest
£165,258
Total Repayable
£412,758
Loan-to-Value
90.0%
How the mortgage calculator works
Start by entering the property price and your deposit. The calculator works out your loan amount automatically — that's the amount you'll actually borrow from the lender.
Next, set the interest rate and mortgage term. Most UK mortgages run for 25 years, though terms from 5 to 40 years are common. The rate you enter should be the annual interest rate offered by your lender.
Hit calculate and you'll see your estimated monthly repayment, the total amount you'll repay over the full term, and how much of that is pure interest. The payment structure bar shows the split between principal and interest at a glance.
Open the amortization schedule to see exactly how your balance reduces year by year. In the early years most of your payment covers interest — over time, more goes toward paying down the actual debt.
What you need to know about UK mortgages
The UK mortgage market offers several product types. Fixed-rate deals lock your interest rate for a set period (typically 2 or 5 years), giving you predictable monthly payments. Variable rate mortgages track the Bank of England base rate and can go up or down.
Key facts for 2025:
- The Bank of England base rate influences mortgage pricing across all lenders
- Most lenders require a minimum 5% deposit, with better rates available at 10%, 15% and 20%+
- Stamp duty (SDLT) is a separate cost — use our stamp duty calculator to check
- Mortgage affordability checks typically use a stressed rate 3% above the product rate
- First-time buyers may access government schemes like the Lifetime ISA bonus
This calculator uses a standard repayment (capital and interest) formula. Interest-only mortgages would have lower monthly payments but you'd still owe the full loan at the end of the term.
Frequently asked questions
How do I calculate my monthly mortgage repayment?
Enter your property price, deposit, interest rate and mortgage term into the calculator above. It uses a standard amortization formula to work out your fixed monthly repayment, total interest and loan-to-value ratio instantly.
What deposit do I need for a UK mortgage?
Most UK lenders require a minimum 5% deposit, though 10–20% will unlock better interest rates. A larger deposit lowers your loan-to-value ratio, which typically means cheaper monthly repayments.
What is loan-to-value (LTV) and why does it matter?
LTV is the percentage of the property price you're borrowing. A £200,000 mortgage on a £250,000 home is 80% LTV. Lower LTV means less risk for the lender, so you'll usually get a lower interest rate.
How does the mortgage term affect my repayments?
A longer term (e.g. 30 years) gives you lower monthly payments but you pay more interest overall. A shorter term (e.g. 15 years) means higher monthly payments but significantly less total interest paid.
What is the average UK mortgage interest rate in 2025?
As of early 2025, average UK mortgage rates sit around 4.5–5% for a 2-year fixed deal and 4–4.5% for a 5-year fix. Rates vary by lender, LTV and your credit profile. Check current rates on the Bank of England website.
What is an amortization schedule?
An amortization schedule shows how each mortgage payment splits between interest and principal over the full term. Early payments are mostly interest. Over time, more goes toward paying off the actual loan balance.
Should I overpay my mortgage?
Overpaying reduces your outstanding balance faster, saving you interest and shortening the term. Most UK lenders allow 10% overpayment per year without penalties. Check your mortgage terms before overpaying.