David Chen is a Certified Financial Analyst with over 10 years of experience in UK buy-to-let and residential mortgage analytics.
Use this free UK property mortgage calculator to estimate monthly interest-only or capital-and-interest payments, total interest and stamp-duty land-tax (SDLT) for English & Welsh properties.
UK Property Mortgage Calculator
UK Mortgage Formula
Interest-Only: Monthly = Loan × annual rate ÷ 12
Capital & Interest: M = P × [ r(1+r)^n ] / [ (1+r)^n – 1 ]
SDLT: Tiered % on slices of purchase price
Formula Sources: MoneyHelper | GOV.UK
Variables
- Loan Amount: Price minus deposit.
- Rate: Annual interest rate (e.g. BoE + margin).
- Term: Usually 25–40 years for repayment; interest-only shorter.
- Repayment Type: Interest-only or capital & interest.
Related Calculators
- Buy-to-Let Yield Calculator UK
- UK Stamp Duty Calculator
- Interest-Only vs Repayment Calculator
- UK Mortgage Overpayment Calculator
What Is the UK Property Mortgage Calculator?
It estimates monthly payments for English & Welsh properties under UK lending rules, including optional SDLT so landlords and home-buyers see complete upfront costs.
How to Calculate UK Property Mortgage (Example)
- Enter purchase price (e.g., £400,000).
- Select deposit % (min 5% residential, 25% buy-to-let).
- Input actual rate quote (e.g., 4.5%).
- Choose repayment type and term, then click “Calculate”.
Frequently Asked Questions (FAQ)
Does this include UK stamp duty? Yes—auto-calculated for England & Wales; Scotland LBTT differs.
Can I use this for buy-to-let? Absolutely—select interest-only and 25% deposit to mirror BTL criteria.
Are rates the same across all UK lenders? No; always compare APRs and arrangement fees.
Is interest-only cheaper per month? Yes, but you must repay the full balance at term-end.