What will the mortgage actually cost?
Put in what you owe, the rate and the term to see the monthly payment, the total interest over the life of the loan, how interest-only compares — and exactly what overpaying, monthly or as a one-off lump sum, would knock off. Free, no sign-up.
A guide, not financial advice. It assumes the rate stays the same for the whole term — in reality most UK deals are fixed for 2–5 years and then revert, so re-check when your deal ends. It doesn't include arrangement or product fees. Talk to a mortgage broker or adviser before you commit. Nothing you type here leaves your browser.
The monthly payment is only half the story.
The monthly payment on a repayment mortgage covers both the interest and a slice of the capital, so the balance shrinks every month and clears at the end of the term. On interest-only you pay just the interest — the payment is lower, but you still owe the full amount when the term ends and need a separate plan to repay it.
Total interest is what the borrowing actually costs you across the whole term. Over 25 years it's often a large fraction of the loan itself — which is why the rate and the term matter so much, and why even a small overpayment pays off.
Overpaying goes straight at the capital, so it cuts both the time left and the interest you'll ever pay. A modest regular overpayment can take years off the term, and a one-off lump sum — a bonus, savings or an inheritance — does the same in a single hit; this tool shows you exactly how much each (or both together) would save. Most UK lenders let you overpay up to 10% of the balance a year without a penalty; check your deal's terms first.
One thing it deliberately keeps simple: it holds the rate steady for the whole term. Real deals are usually fixed for a few years then move to the lender's higher standard variable rate, so treat the long-run figures as a like-for-like comparison rather than a forecast.
Your mortgage is one part of the picture.
Stead keeps your whole home in one place — the mortgage and bills, the certificates and renewals, the jobs that need doing. For landlords it builds a tax-year P&L per property and tracks the compliance that protects your investment.