Mortgage repayment calculator
Last checked UK · illustrative onlyNot a lender or brokerAboutDisclaimer
RLPublished by Rodway Labs — not a mortgage adviser
Work out a standard UK capital-and-interest monthly payment, total interest and amount repayable — with explicit assumptions.
Methodology & assumptions · Last checked
Your inputs
Starter figures are UK examples you can edit — replace them with your balance, rate, term and fees. Results update as you type.
Results
Monthly payment
£1,111.66
Total repayable
£333,499
Total interest
£133,499
First-year interest (approx.)
£8,909
Final-year interest (approx.)
£320
Illustrative only — not personalised financial advice and not an FCA-regulated mortgage recommendation. Check your offer, Key Facts Illustration, and lender terms. Rates, fees and tax rules change. Focus is England & Northern Ireland where tax/SDLT rules apply; Scotland and Wales have different property tax regimes. Full calculator disclaimer.
What to do next
Methodology, equations & assumptions
Last checked . Figures are illustrative; tax and product rules can change. England & NI focus for SDLT-related tools — Scotland (LBTT) and Wales (LTT) differ.
M = P × r(1+r)ⁿ / ((1+r)ⁿ − 1), where P is the loan, r is the monthly interest rate (annual ÷ 12 ÷ 100), and n is the number of months.
- Capital and interest repayment; fixed rate for the whole term.
- Monthly payments; fees not included in the payment.
Notes & FAQs
- Is this the same as my lender’s schedule?
- It should be close for a fixed capital-and-interest loan, but lenders may use different day-count or rounding conventions.