How to use it
- Enter loan amount.
- Enter annual interest rate.
- Enter term in years.
- View monthly payment, total interest and total payments.
What it does – The Mortgage Cost UK Calculator takes your loan amount, the annual interest rate and the term in years, then instantly shows three key figures: the monthly payment you’ll need to budget, the total interest you’ll pay over the life of the loan, and the overall sum of all payments.
Why it matters – Knowing the monthly payment helps you match the mortgage to your cash flow, while the total interest reveals the true cost of borrowing. The total of payments lets you compare different loan offers side‑by‑side.
How to read the results – The monthly payment is the amount debited each month. Total interest is the extra money above the original loan. Total of payments = loan amount + total interest. Use these numbers to negotiate rates, plan savings or decide on a shorter term.
Pro tips
- Round the loan amount to the nearest £1,000 for quicker budgeting.
- Include a small buffer for interest rate changes if you expect rates to move.
- Calculate with the exact term you plan to stay in the property, not the maximum term.
- Double‑check that the interest rate is expressed as an annual percentage rate (APR).
Real-life examples
- First‑time buyer comparing two 25‑year mortgages.
- Homeowner refinancing to see how a lower rate reduces monthly outflow.
- Investor evaluating cash flow for a buy‑to‑let property.
Case study
Sarah, a first‑time buyer, entered a £200,000 loan, 3.5% interest and a 30‑year term. The calculator showed a £898 monthly payment, £123,000 total interest and £323,000 total payments, helping her choose a shorter 20‑year option that saved £30,000 in interest.