Finance Calculators
Mortgage Calculator
Calculate your monthly mortgage payments including principal, interest, and the impact of your down payment. See how much home you can afford.
Formula Used
Monthly Payment = P × [r(1+r)^n] ÷ [(1+r)^n − 1], where P = loan amount (home price minus down payment), r = monthly interest rate, n = total months.
About This Calculator
What It Does
Calculate your monthly mortgage payment based on the home price, your down payment, the loan term, and the interest rate. See the loan amount, total interest, and total repayment over the life of the loan. This calculator covers principal and interest only — it does not include property taxes, homeowners insurance, HOA fees, or mortgage insurance (PMI). Use it to understand how your down payment size, loan term, and interest rate interact. A larger down payment means a smaller loan and less interest. A shorter term means higher payments but dramatically less total interest.
Worked Example
Example 1 — Standard: A £250,000 home with £50,000 down (20%) leaves a £200,000 loan. Over 25 years at 4.5%: monthly payment ≈ £1,112. Total interest ≈ £133,600. Example 2 — 15-year term: Same £200,000 at 4.5% over 15 years: monthly payment ≈ £1,530. Total interest ≈ £75,400. Saving over £58,000 in interest. Example 3 — Larger down payment: A £250,000 home with £75,000 down (30%) leaves a £175,000 loan at 4.5% over 25 years: monthly payment ≈ £973. Total interest ≈ £116,900.
Real-World Usage
Home buyers use this to determine their price range before starting their search. Compare fixed and variable rate scenarios. See how a 15-year vs 30-year term fits your budget. Real estate agents use it to illustrate affordability. Refinancing decisions: compare current loan terms against a new offer. Use it to plan — a larger down payment reduces not just your monthly payment but also the total interest by tens of thousands.
Local Context
UK mortgages typically use 2-5 year fixed rates, followed by the lender's standard variable rate (SVR). Most lenders require at least 5-10% deposit. Average rates range 4-6% for 2-year fixes. Stamp Duty Land Tax applies above £250,000 (first-time buyers). Valuation and solicitor fees add £1,000-3,000 upfront. The Bank of England base rate influences all mortgage pricing.
Sources and Methodology
Mortgage estimates use standard amortization formulas plus configured country-specific assumptions for taxes, fees, insurance, or purchase costs where available. Check final affordability, fees, and eligibility with lenders and official housing, tax, or central bank sources for your jurisdiction.
Last reviewed: May 2026.
This is an estimate only and does not constitute a loan offer or commitment. Actual rates, terms, and payments depend on lender policies, credit score, property location, and other factors.
Frequently Asked Questions
How much deposit do I need?
Most lenders require at least 5-10% of the property price. A larger deposit (15-20%) gets you better interest rates. First-time buyers can access 95% mortgage products with a 5% deposit.
What is Stamp Duty Land Tax?
SDLT is a tax paid when buying property in England and Northern Ireland. Rates start at 0% for properties under £250,000 (first-time buyers) or £125,000 (existing homeowners). Higher rates apply above these thresholds.
Are 2-year or 5-year fixed rates better?
2-year fixes offer lower initial rates but you must remortgage sooner. 5-year fixes provide payment certainty longer but may have slightly higher rates. Your choice depends on your plans and market expectations.