30-Year Mortgage Calculator (UK, 2026)
Work out the monthly repayment on a 30-year mortgage term and see what the lower monthly payment costs in extra lifetime interest. Defaults use Bank of England's recent quoted rate.
30 years vs other terms
Same £240,000 loan at 4.32% — what changing the term does to the monthly payment and lifetime interest:
| Term | Monthly | vs 30-year | Total interest | Interest vs 30-year |
|---|---|---|---|---|
| 10 years | £2,467 | +£1,276 | £55,986 | −£132,598 |
| 15 years | £1,814 | +£623 | £86,516 | −£102,067 |
| 20 years | £1,495 | +£305 | £118,834 | −£69,750 |
| 25 years | £1,310 | +£119 | £152,880 | −£35,704 |
| 30 years (this page) | £1,191 | — | £188,584 | — |
30-year monthly payments by loan size
At 4.32% over 30 years. Each row links to a full cost breakdown for that loan size:
| Loan | Monthly payment | |
|---|---|---|
| £100,000 | £496 | Full £100k cost guide → |
| £150,000 | £744 | Full £150k cost guide → |
| £200,000 | £992 | Full £200k cost guide → |
| £250,000 | £1,240 | Full £250k cost guide → |
| £300,000 | £1,488 | Full £300k cost guide → |
| £350,000 | £1,736 | Full £350k cost guide → |
| £500,000 | £2,480 | Full £500k cost guide → |
The 30-year reality
Terms of 30 years and longer are now the norm for UK first-time buyers — UK Finance data shows the average new first-time buyer term has drifted above 30 years as prices outpaced incomes. The appeal is simple: stretching from 25 to 30 years cuts the committed monthly payment meaningfully, which can be the difference between passing and failing a lender's affordability stress test.
The cost is the interest-heavy tail. Those five extra years sit at the start of the amortisation schedule where payments barely touch the principal, so the total interest bill on a typical loan rises by tens of thousands of pounds — the comparison table above puts an exact number on it for your loan.
The pragmatic play many borrowers use: take the 30-year term for the low committed payment, then overpay whenever income allows. Most lenders permit penalty-free overpayments of 10% of the balance per year even inside a fix, which lets you run an effective 22–25-year schedule with a 30-year safety net. The mortgage comparison calculator models exactly how much term and interest a given overpayment removes.
How it's calculated
The monthly payment uses the standard amortising-loan formula used by every UK lender:
M = P × (i × (1+i)n) / ((1+i)n − 1)
where P is the loan (price minus deposit), i is the monthly rate (annual ÷ 12) and n is 360 payments (30 years × 12). Interest accrues on the outstanding balance, which is why shortening the term saves so much — see the full explanation on the main mortgage calculator.
Frequently asked questions
How much cheaper per month is a 30-year mortgage than a 25-year?
On a £240,000 loan at 4.32%, a 30-year term costs about £1,191 a month versus £1,310 over 25 years — roughly £119 a month lower. The trade-off: total interest rises from about £152,880 to £188,584.
Is a 30-year mortgage normal in the UK now?
Yes — terms over 30 years are now the norm for UK first-time buyers (UK Finance reports the average new first-time buyer term is over 30 years). Longer terms became standard as house prices outpaced incomes and affordability stress tests tightened.
Can I overpay a 30-year mortgage to finish it faster?
Yes. Most UK lenders allow penalty-free overpayments of up to 10% of the outstanding balance per year, even during a fix. Taking a 30-year term for the lower committed payment and overpaying when you can gives you flexibility with much of the interest saving of a shorter term — model this on the mortgage comparison calculator.
Is there an age limit on a 30-year mortgage?
Most lenders cap the age at the end of the term at 70–75 (some go higher with proven retirement income). A 30-year term taken at 40 runs to age 70, which is around the limit for many mainstream lenders.
Related calculators & guides
- Mortgage calculator — any term, with a full rate × term payment matrix
- Mortgage comparison & overpayment calculator — products side-by-side, fees and overpayments modelled
- Affordability calculator — how much could you borrow?
- Stamp duty calculator — SDLT, LBTT and LTT with all surcharges
- The term-extension trap: 25 vs 35-year mortgages
- What extending your mortgage term really costs
This calculator is a general-information tool, not a mortgage offer or financial advice. Your actual rate depends on lender, LTV, credit profile, product fees and stress-test outcomes. Speak to a regulated mortgage adviser before committing. Source for default rate: Bank of England's monthly effective interest rates.