Skip to main content

UK Mortgage Calculator (2025)

Calculate monthly mortgage payments including taxes, insurance and PMI. See full amortization schedule.

Monthly payment
$2,628.97
PITI + PMI + HOA

20.0% of home price

PMI not required

Total monthly payment
$2,628.97
Principal, interest, taxes, insurance, PMI & HOA
Principal & interest
$2,128.97
Loan amount
$320,000.00
Total interest paid
$446,428.47
Total cost of home
$846,428.47

Monthly payment breakdown

Amortization schedule

  • 100% private

    All math runs in your browser. Nothing leaves your device.

  • Formula-verified

    Each calculator is unit-tested against authoritative sources.

  • Instant results

    Static-rendered pages. Sub-second loads on any device.

  • Works offline

    Visit once and it keeps working without an internet connection.

How to use the UK Mortgage Calculator (2025)

  1. 1

    Enter the property price

    Type the agreed purchase price in pounds. For new builds use the asking price; for resale homes use the offer figure accepted by the vendor (not the listing price).

  2. 2

    Set your deposit

    Enter the cash you are putting down. Aim for at least 10% to unlock most mainstream lenders, and 15% to access the competitive 85% LTV rate tier from high-street banks.

  3. 3

    Choose the term and interest rate

    Pick the mortgage term in years (25 is the UK norm) and enter the headline rate from your lender or comparison site. Use a 2-year or 5-year fixed quote for accurate near-term planning.

  4. 4

    Review monthly payment and total interest

    The result card shows your level monthly repayment plus the lifetime interest cost. The amortisation schedule reveals how slowly capital is repaid in the early years of a UK mortgage.

  5. 5

    Test an overpayment scenario

    Bump up the monthly figure by £100-£500 to see how many years come off the term. Most UK fixed deals permit 10% annual overpayments penalty-free — a powerful interest-saving lever.

What this calculator does

A mortgage is a long-term secured loan used to buy property. In the UK, the most common product is a 25-30 year repayment mortgage where each monthly payment covers both interest and a small slice of capital, gradually reducing the balance to zero by the end of the term. A repayment calculator answers the most important question first-time buyers and re-mortgagors have: "what will my monthly payment actually be at this rate?" — without needing a broker call. It also reveals two figures lenders rarely highlight: the total interest you will pay over the term, and how slowly the principal is repaid in the early years. On a typical 25-year mortgage at 5.5%, more than 65% of your first year's payments go on interest alone.

Formula

M = P × [ r(1+r)ⁿ ? ((1+r)ⁿ − 1) ]
M
Monthly repayment (£)
P
Loan amount = property price — deposit (£)
r
Monthly interest rate = annual rate ÷ 12
n
Total number of monthly payments = term in years × 12

This is the standard amortising-loan formula. The numerator r(1+r)ⁿ pushes future payments to present value; the denominator (1+r)ⁿ − 1 normalises across the full term so each instalment is identical. UK lenders quote APR (Annual Percentage Rate of Charge) but use the nominal monthly rate for actual repayment maths — there is a small ~0.1-0.2% gap between the two on a typical 25-year deal because APR includes arrangement fees amortised across the term.

Worked examples

Example: £350,000 home, 10% deposit, 5.25% over 30 years

You buy a £350,000 first home with a £35,000 deposit, leaving a £315,000 mortgage at 5.25% over 30 years.

Monthly rate r = 5.25 ÷ 12 ÷ 100 = 0.004375 Number of payments n = 30 × 12 = 360 (1+r)ⁿ ? 4.819 M = 315,000 × (0.004375 × 4.819) ÷ (4.819 − 1) M ? £1,738.95 per month

Over the full 30 years you would pay £626,022 — meaning £311,022 of interest on top of the £315,000 borrowed. Increasing your payment by just £100/month would shrink the term to ~26.5 years and save roughly £52,000 in interest.

Example: re-mortgaging £180,000 onto a 5-year fix at 4.49%

You have £180,000 outstanding with 22 years to run and your fixed rate has expired. Halifax offers 4.49% fixed for 5 years.

M ? £1,107/month for the next 5 years.

After the fix expires you revert to your lender's SVR (typically 7-8%) unless you re-mortgage again. Plan to remortgage 6 months before your fix ends — the FCA permits porting offers up to 6 months ahead, locking in today's rate.

Common use cases

  • Working out affordability before you make an offer on a UK property
  • Comparing two-year vs five-year fixed deals net of arrangement fees
  • Deciding between a 25-year and 30-year term to balance monthly cost vs lifetime interest
  • Estimating savings from overpaying by £100, £200 or £500 per month
  • Re-mortgaging at the end of a fixed period to a new product
  • Modelling the move from interest-only to repayment
  • Sanity-checking a broker's quote before signing the mortgage offer
  • Buy-to-let cash-flow planning when rental income must cover ICR (Interest Coverage Ratio) of 145% at 5.5% stress test

What affects the result

  • Loan-to-Value (LTV) — UK lenders price tiers at 60%, 75%, 80%, 85%, 90% and 95% LTV. Dropping from 85% to 80% can save 0.3-0.5% on rate.
  • Mortgage term — longer term means lower monthly cost but dramatically more total interest. 25 years is the UK norm; 30-35 year terms have grown post-2022.
  • Fixed vs variable — most UK borrowers fix for 2 or 5 years. Trackers follow Bank of England base rate plus a margin.
  • Credit score — Experian/Equifax/TransUnion scores below 880 typically lose access to top rates from prime lenders.
  • Income multiple — most lenders cap at 4.5x sole / 4.5x joint income; some go to 5.5x for professionals or high earners.
  • Stress test — under FCA rules lenders must affordability-test you at SVR + 1% (typically 8-9%), not the headline rate.
  • Product fees — arrangement fees of £999-£1,999 are common on lowest-rate products. Calculate the true cost over the fixed period.
  • Stamp Duty Land Tax (SDLT) — adds materially to upfront costs above £250,000 (£425,000 for first-time buyers as of April 2025).

Tips

  • Aim for a 15% deposit minimum — the 85% LTV tier opens the most competitive mainstream rates
  • If you are 1-2% above an LTV band (e.g., 86%), find another £3,000-£5,000 to drop to 85% — the rate saving usually pays it back within 18 months
  • Use a fee-free whole-of-market broker (London & Country, Habito) — they are paid by the lender, not you
  • Make overpayments of up to 10% per year — this is allowed penalty-free on most fixed deals
  • Set up a "remortgage diary" 6 months before any fixed period ends
  • Lock in a new product as soon as your current fix has 6 months left — you are protected if rates drop further
  • For first-time buyers, check Lifetime ISA eligibility — £4,000/year contribution earns a 25% government top-up (£1,000) towards your deposit
  • Compare on TrueCost (rate + fee + cashback over the deal period), not just headline rate

Mistakes to avoid

  • Forgetting that fixed-rate deals revert to a much higher SVR after the fix ends — budget for the reversion
  • Comparing rates without including arrangement fees — a 4.5% fee-free deal often beats a 4.3% deal with a £1,999 fee on a small loan
  • Underestimating buying costs — solicitor (£1,200-£2,000), survey (£400-£1,500), SDLT, removals and broker fees easily total £5,000-£15,000
  • Stretching the term to 35 years to "afford" the house — you may pay double the interest over the life of the loan
  • Choosing interest-only without a credible repayment vehicle — this triggers FCA scrutiny and is rare outside BTL
  • Ignoring early repayment charges (typically 1-5% of balance) when planning to overpay or remortgage early
  • Not checking porting rules if you might move home during the fixed period

Frequently asked questions

Is the calculator accurate for UK mortgages?

Yes — it uses the same standard amortisation formula (PMT) that every UK lender, mortgage advisor and FCA-regulated comparison site uses. Your final figure from a lender may differ by a few pounds because lenders round and apply daily-interest accrual, but the result here is correct to within ~£2/month for any UK product.

Does this include UK Stamp Duty (SDLT)?

No — this calculator focuses on monthly repayments. SDLT is a one-off purchase cost, not part of your mortgage. For 2025 transactions: 0% up to £125,000, 2% £125,001-£250,000, 5% £250,001-£925,000, 10% £925,001-£1.5m, 12% above. First-time buyers pay 0% up to £300,000 and 5% on £300,001-£500,000 (relief only available on properties up to £500,000).

How is the monthly payment calculated?

Using the standard amortising formula M = P × r(1+r)ⁿ ÷ ((1+r)ⁿ − 1) where P is the loan, r is the monthly rate (annual ÷ 12) and n is the total number of monthly payments. This produces a level monthly payment where the interest portion shrinks and the capital portion grows over the term.

What's the difference between a fixed and variable rate?

A fixed rate is locked for a set period (typically 2 or 5 years) — your payment cannot change. A variable rate (tracker, discount or SVR) moves with the Bank of England base rate or your lender's discretion. ~85% of new UK mortgages are fixed because borrowers value payment certainty.

Can I overpay my mortgage?

Most UK fixed-rate mortgages allow overpayments of up to 10% of the outstanding balance per calendar year without penalty. Overpaying just £100/month on a £200,000 mortgage at 5% can knock 4-5 years off the term and save £30,000+ in interest. Always confirm your lender's specific overpayment terms in the mortgage offer.

What is LTV and why does it matter?

Loan-to-Value is the loan amount as a percentage of the property value. £180,000 borrowed against a £200,000 home = 90% LTV. Lenders price in tiers: 60%, 75%, 80%, 85%, 90% and 95%. Each tier down typically saves 0.2-0.5% on the rate, so larger deposits dramatically reduce lifetime cost.

How much can I borrow on a UK mortgage?

Most lenders cap the total mortgage at 4.5x your gross annual income (sole or joint). Higher earners and certain professionals (doctors, teachers, lawyers) can sometimes borrow 5-5.5x. Affordability is also stress-tested at your lender's SVR + 1% to ensure you could still pay if rates rise.

Do I need mortgage protection insurance?

It is not legally required in the UK, but most lenders require buildings insurance from completion day. Income protection and life insurance are strongly recommended for mortgaged owners with dependants average level-term cover for a 30-year-old non-smoker is £15-£25 per month.

Last reviewed:

Sources & references

This calculator provides illustrative figures only. It is not a mortgage offer and does not constitute regulated financial advice. For a binding quote, speak to an FCA-authorised mortgage adviser. Your home may be repossessed if you do not keep up repayments on your mortgage.

Related Calculators

UK Take-Home Pay Calculator

Calculate your UK 2025/26 take-home pay after income tax, National Insurance, student loan and pension.

Calculate

India Salary Calculator

Convert CTC to monthly in-hand salary. Computes income tax under new and old regime, EPF, professional tax.

Calculate

Australia Tax Calculator

Calculate Australian take-home pay for FY 2025-26 with ATO rates, Medicare Levy and Superannuation.

Calculate

US Income Tax Calculator

Federal + state + FICA take-home pay calculator for 2025. All 50 states + DC, filing status, 401(k) and HSA pre-tax support.

Calculate

Canada Income Tax Calculator

Federal + provincial + CPP + EI take-home pay calculator for 2025. All 13 provinces and territories with verified CRA brackets.

Calculate

Germany Income Tax Calculator

Brutto-Netto-Rechner 2025 with Einkommensteuer, Solidaritätszuschlag, Kirchensteuer and Sozialversicherung. Implements § 32a EStG formula.

Calculate