Free Mortgage Calculator UK Online
Use this free mortgage calculator UK to estimate your monthly repayment, total interest, and stamp duty in pounds sterling. Enter the property price, deposit, interest rate, term, and mortgage type to see a full breakdown for repayment or interest-only mortgages.
Monthly Payment
Enter your details to calculate
How This Mortgage Calculator UK Works
The mortgage calculator UK subtracts your deposit from the property price to find the loan amount, then amortizes it over your chosen term at the given interest rate. For repayment mortgages, each monthly payment covers both capital and interest. For interest-only, you pay just the interest each month and owe the full capital at the end.
For a typical UK property priced at £300,000 with a£60,000 deposit (20%) at 4.5% over 25 years, the mortgage calculator UK shows a monthly repayment of about£1,334. Total interest over the full term comes to roughly £160,000. An interest-only mortgage on the same deal would cost just £900/month but you would still owe£240,000 at the end.
The mortgage calculator UK also computes stamp duty land tax (SDLT) for England and Northern Ireland, showing this as an upfront cost you need to budget for alongside your deposit. This gives you a realistic picture of the total cash needed to complete your purchase.
UK Stamp Duty Bands (England & NI)
The mortgage calculator UK computes stamp duty automatically based on the property price you enter.
3 Tips for UK Mortgage Borrowers
Bigger Deposit
Increasing your deposit from 10% to 20% typically unlocks rates 0.5-1% lower and eliminates higher lending charges. On a£250,000 property, that rate drop saves roughly£15,000 in interest over 25 years. Run scenarios in the mortgage calculator UK.
Shorter Term
A 20-year term instead of 30 increases monthly payments by about 15-20% but can save £30,000-£50,000 in total interest. The mortgage calculator UK lets you compare terms side by side to find the right balance.
Overpayments
Most UK mortgages allow up to 10% overpayment per year without penalty. Even £100 extra per month can shave 4-5 years off a 25-year term and save thousands in interest. Check your lender's terms and use the mortgage calculator UK to model the impact.
Frequently Asked Questions
Disclaimer: This mortgage calculator UK is for educational purposes only. Stamp duty rates shown are for England and Northern Ireland — Scotland and Wales have different systems. Consult a qualified mortgage advisor before making borrowing decisions.
More Finance Calculators
Mortgage Calculator
Calculate your monthly mortgage payment, total interest, and amortization schedule.
Amortization Calculator
See your full loan amortization schedule with principal and interest breakdown by month.
Loan Calculator
Estimate monthly payments and total cost for any personal or auto loan.
Car Payment Calculator
Calculate your monthly car payment and total loan cost based on price, rate, and term.