UK repayment or interest-only mortgage with stamp duty.
How to use this calculator
Every field updates the result as you type — there is no submit step. The inputs below are pre-filled with a realistic example so you can see how the tool behaves before entering your own figures.
| Field | Unit | What it means |
|---|---|---|
| Property price | £ | Enter a numeric value. |
| Deposit | £ | Enter a numeric value. |
| Interest rate | % | Enter a numeric value. |
| Term | yrs | Enter a numeric value. |
| Mortgage type | — | Select the mode that matches your situation. |
| First-time buyer | yes / no | Toggle this on to include it in the calculation. |
| Additional property (5% surcharge) | yes / no | Toggle this on to include it in the calculation. |
Worked example
Using the default values loaded into the calculator above, the result is:
| Input | Value |
|---|---|
| Property price (£) | 350000 |
| Deposit (£) | 52500 |
| Interest rate (%) | 4.75 |
| Term (yrs) | 25 |
| Mortgage type | Repayment |
| First-time buyer | no |
| Additional property (5% surcharge) | no |
| Output | Value |
|---|---|
| Monthly payment | £1,696.10 |
| Loan amount | £297,500.00 |
| Loan to value | 85% |
| Total interest | £211,329.75 |
| Total repaid | £508,829.75 |
| Stamp duty (England & NI) | £7,500.00 |
| Cash needed upfront | £60,000.00 |
Reading the result
Financial projections compound small assumption changes into large differences over time. Rates, fees and tax treatment vary by lender and jurisdiction, so treat the output as a well-structured estimate for comparing options rather than a quotation.
Figures that change annually — tax bands, contribution limits, statutory rates — are exposed as editable inputs. Check them against current published values before relying on the result.
Sharing and saving a calculation
The "Copy link" button encodes every value you have entered into the page URL. Opening that link restores the calculation exactly, which makes it easy to bookmark a scenario, send it to someone else, or keep several variations side by side in separate tabs.
Frequently asked questions
What does the Mortgage Calculator UK do?
UK repayment or interest-only mortgage with stamp duty.
What result do the default values produce?
With the values pre-loaded in the calculator, monthly payment comes to £1,696.10.
Is this calculator free to use?
Yes. It is free, requires no account, and runs entirely in your browser — nothing you enter is transmitted or stored on a server.
Can I save or share a calculation?
Yes. The "Copy link" button builds a URL containing all your entered values. Anyone opening that link sees the same calculation.
How accurate is the result?
The calculation itself is exact for the inputs given. Real-world accuracy depends on how well those inputs reflect your actual situation, so review the assumptions before relying on the figure.