UK Mortgage Calculators
Compare mortgage repayments, overpayments and property costs with simple UK mortgage calculators. All calculations run in your browser — no sign-up, no data stored.
Mortgage tools
Mortgage Calculator
Work out your monthly repayment, total interest and loan-to-value. Includes yearly breakdown.
Open →How Much Can I Borrow?
Estimate your mortgage borrowing capacity based on income, deposit and existing debts. Educational estimate only.
Open →Mortgage Overpayment Calculator
See how much interest you could save and how many years you could cut off your mortgage term.
Open →Property & buying costs
Stamp Duty Calculator (England & NI)
SDLT for England and Northern Ireland, including first-time buyer relief and additional property rates. 2026/27.
Open →Stamp Duty Scotland (LBTT)
Land and Buildings Transaction Tax for Scotland, including first-time buyer relief. 2026/27.
Open →Stamp Duty Wales (LTT)
Land Transaction Tax for Wales, including higher residential property rates. 2026/27.
Open →Mortgage guides
How much will my mortgage cost?
Understand repayment vs interest-only, how interest is calculated and what affects your monthly payment.
Read →How much do mortgage overpayments save?
See how overpaying reduces interest and shortens your term — and when it might not be the best choice.
Read →Fixed or variable rate mortgage?
Compare fixed, tracker and SVR mortgages — the trade-offs between certainty and flexibility.
Read →Important: Casvia mortgage calculators are educational tools. Actual mortgage affordability depends on lender criteria, income verification, expenditure, credit history and other circumstances. Always speak to a mortgage adviser or lender before making decisions.