Estimate your monthly mortgage payment from the loan amount, interest rate and term. See the total interest over the life of the loan and compare a capital-repayment mortgage with interest-only.
Mortgage details
£
£
%
yrs
Monthly payment
£1,167
Loan amount £210,000
Loan amount£210,000
Monthly payment£1,167
Total interest£140,175
Total repaid over term£350,175
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How mortgage repayments are calculated
A repayment (capital and interest) mortgage uses a standard amortisation formula: each month you pay the interest due on the outstanding balance plus a slice of the capital, sized so the loan clears exactly at the end of the term. Early on, most of the payment is interest; later, most is capital. A longer term lowers the monthly payment but increases the total interest you pay.
Worked example
250,000 over 25 years at 4.5% gives about 1,390/month.
Total paid about 417,000, of which roughly 167,000 is interest.
Shorten to 20 years and the payment rises to about 1,582 but total interest falls sharply.
Interest-only payments cover just the interest, so they are lower - but the full balance is still owed at the end and must be repaid from savings, sale or another arrangement. Interest-only is now common mainly for buy-to-let.
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Frequently asked questions
Does this include other homebuying costs?
No - it shows the mortgage payment only. Budget separately for buildings insurance, any service charge or ground rent, and ongoing maintenance, plus Stamp Duty when you buy.
How does overpaying help?
Overpayments come straight off the capital, so they cut both the balance and all the future interest on it. Even small regular overpayments can shave years off the term - see the Mortgage Overpayment calculator.
Report a bug or ask a question about this calculator
Important: BrickCrunch provides general information and estimates only — this is not financial, tax, mortgage or legal advice. Calculations are simplified and your circumstances may differ. UK tax and rate figures are checked against gov.uk (21 June 2026 (2026/27 tax year)) but rates change and errors are possible. Always confirm figures with gov.uk or a qualified professional before making decisions.
