UK Mortgage Calculator
UK Mortgage Calculator. Free, instant, no signup. Results update as you type.
You are viewing the archived 2025-26 rules. Switch to the current tax year.
Monthly payment
£2,311.12
- Principal & interest £1,896.20
- Property tax £312.50
- Insurance £102.42
- Loan amount £300,000.00
- Total interest paid £382,633.47
- Total cost of loan £682,633.47
View year-by-year schedule
| Year | Principal | Interest | Balance |
|---|---|---|---|
| 1.00 | 3,353.18 | 19,401.27 | 296,646.82 |
| 2.00 | 3,577.74 | 19,176.70 | 293,069.08 |
| 3.00 | 3,817.35 | 18,937.10 | 289,251.73 |
| 4.00 | 4,073.01 | 18,681.44 | 285,178.72 |
| 5.00 | 4,345.79 | 18,408.66 | 280,832.93 |
| 6.00 | 4,636.83 | 18,117.62 | 276,196.10 |
| 7.00 | 4,947.37 | 17,807.08 | 271,248.73 |
| 8.00 | 5,278.70 | 17,475.75 | 265,970.03 |
| 9.00 | 5,632.23 | 17,122.22 | 260,337.81 |
| 10.00 | 6,009.43 | 16,745.02 | 254,328.38 |
| 11.00 | 6,411.89 | 16,342.56 | 247,916.49 |
| 12.00 | 6,841.31 | 15,913.14 | 241,075.18 |
| 13.00 | 7,299.48 | 15,454.97 | 233,775.70 |
| 14.00 | 7,788.34 | 14,966.11 | 225,987.36 |
| 15.00 | 8,309.94 | 14,444.51 | 217,677.42 |
| 16.00 | 8,866.47 | 13,887.98 | 208,810.95 |
| 17.00 | 9,460.28 | 13,294.17 | 199,350.68 |
| 18.00 | 10,093.85 | 12,660.60 | 189,256.83 |
| 19.00 | 10,769.85 | 11,984.60 | 178,486.98 |
| 20.00 | 11,491.13 | 11,263.32 | 166,995.85 |
| 21.00 | 12,260.71 | 10,493.74 | 154,735.14 |
| 22.00 | 13,081.83 | 9,672.62 | 141,653.30 |
| 23.00 | 13,957.95 | 8,796.50 | 127,695.36 |
| 24.00 | 14,892.74 | 7,861.71 | 112,802.62 |
| 25.00 | 15,890.13 | 6,864.32 | 96,912.49 |
| 26.00 | 16,954.32 | 5,800.13 | 79,958.16 |
| 27.00 | 18,089.79 | 4,664.66 | 61,868.38 |
| 28.00 | 19,301.29 | 3,453.16 | 42,567.08 |
| 29.00 | 20,593.94 | 2,160.51 | 21,973.15 |
| 30.00 | 21,973.15 | 781.30 | 0.00 |
Repayment mortgage at a fixed rate for the whole term. Excludes mortgage insurance, HOA fees and closing costs.
How to use this calculator
- Enter home price — The calculator loads with a worked example already filled in, so you can see what a realistic set of figures looks like before replacing them with your own.
- Fill in the remaining fields — Every field has a sensible default. Change the ones that apply to you and leave the rest.
- Read the result — The answer updates as you type — there is nothing to submit. The rows beneath the headline show how it breaks down.
- Expand the schedule — Where a year-by-year table is offered, open it. The breakdown over time usually shows something the single headline figure does not.
- Share or print — Use the share button to copy a link with your figures already filled in, or print the result — the print stylesheet strips the navigation and adverts.
What this calculator works out
To use the UK Mortgage Calculator, enter your home price, down payment and interest rate. The result — monthly payment — updates as you type, with no button to press and nothing to submit. The calculation runs entirely in your browser, so the figures you enter are never sent anywhere.
How this is calculated
The monthly payment comes from the standard amortisation formula, M = P × i ÷ (1 − (1 + i)−n), where P is the amount borrowed, i is the monthly interest rate and n is the total number of monthly payments. A thirty-year loan has 360 of them. Property tax and insurance are divided across twelve months and added to the payment, but excluded from the interest total — they are a cost of owning the property, not of borrowing.
A worked example
Take the values this page loads with:
- Home price: £350,000.00
- Down payment: £50,000.00
- Interest rate: 6.5%
- Loan term: 30
- Property tax (per year): £3,750.00
On those figures the monthly payment is 2,311.12. Broken down:
- Principal & interest: 1,896.20
- Property tax: 312.50
- Insurance: 102.42
- Loan amount: 300,000.00
- Total interest paid: 382,633.47
Change any field above and every figure here recalculates — these numbers are produced by the same formula the calculator runs, so they cannot drift apart from it.
What the figures mean
The headline figure answers the immediate question. These are the ones worth paying attention to:
- Total interest paid — the figure worth watching when you change your inputs.
- Total cost of loan — the figure worth watching when you change your inputs.
Where a schedule is shown, expand it: the year-by-year breakdown usually reveals something the single headline number hides.
What this calculator assumes
Repayment mortgage at a fixed rate for the whole term. Excludes mortgage insurance, HOA fees and closing costs.
Why it runs in your browser
Every calculation on this page is arithmetic, and arithmetic does not need a server. Running it locally means the result is instant, it keeps working if your connection drops, and — the part that matters — your salary, your debts and your medical measurements are never transmitted to us. There is no figure on our side to store, log or lose.
Where this calculator stops
A calculator applies the rules it is given to the figures you enter. It cannot see the rest of your circumstances, and real financial decisions are rarely decided by a single number.
Treat the result as a starting point for a conversation — with a lender, an accountant or an adviser — rather than as an answer. Where an institution will quote you a real figure, that figure is the one that counts: it will include fees, your credit profile and terms this page knows nothing about.
Keeping the figures current
The formula behind this page does not change, but the assumptions you should bring to it do — interest rates, inflation and market returns all move. Revisit the inputs rather than trusting a figure you calculated a year ago.