House Deposit Calculator
Work out exactly how much deposit you need, your loan-to-value (LTV) ratio, and how much to save each month to hit your target — instantly and for free.
Work Out Your Deposit Requirement
A mortgage deposit is the upfront lump sum you put towards a property purchase, with the rest covered by a mortgage loan. Use the calculator to see your deposit amount, your loan-to-value ratio, and how much you still need to save.
How the Calculation Works
Understanding deposit, loan amount and LTV
Set Your Target House Price
Enter the property price you’re budgeting for, based on the type of home and area you’re looking at.
Choose a Deposit Percentage
Most lenders require a minimum of 5%, but a larger deposit of 15% to 25%+ usually unlocks lower mortgage interest rates.
Calculate Your Loan-to-Value (LTV)
LTV is the percentage of the property value you’re borrowing. A lower LTV generally means cheaper mortgage deals and more lender choice.
Check Your Monthly Savings Target
Enter what you’ve already saved and your savings timeframe to see the monthly amount needed to hit your deposit goal.
Deposit & LTV Calculator
Adjust the figures below — results update instantly
Most lenders require a minimum of 5%.
Deposit Size vs. LTV Ratio
A quick guide to how common deposit sizes translate into loan-to-value ratios on a typical UK mortgage.
| Deposit Size | Lender Tier | Resulting LTV | Rate Outlook |
|---|---|---|---|
| 5% | Minimum-deposit / first-time buyer schemes | 95% | Highest rates |
| 10% | Standard high-street lenders | 90% | Above-average rates |
| 15% | Standard high-street lenders | 85% | Improved rates |
| 20% | Wider lender panel | 80% | Competitive rates |
| 25% | Wider lender panel | 75% | Strong rates |
| 40%+ | Full lender panel | 60% or lower | Best available rates |
House Deposit FAQ
Answers to the most frequently asked questions about house deposits in the UK.
Most UK mortgage lenders require a minimum deposit of 5% of the property’s purchase price. However, a 10% to 15% deposit typically unlocks better interest rates, and a 25% deposit or more usually secures the most competitive deals, since it lowers your loan-to-value ratio.
Loan-to-value (LTV) is the percentage of the property’s value that you are borrowing as a mortgage, calculated as the loan amount divided by the property value. A lower LTV, achieved with a larger deposit, generally means access to lower mortgage interest rates and a wider choice of lenders.
Yes. A Lifetime ISA (LISA) adds a 25% government bonus on savings up to £4,000 per year, which can be put towards a first home worth up to £450,000. The Help to Buy ISA scheme closed to new applicants but existing account holders can still claim their bonus when they complete their purchase.
Yes. Beyond the deposit itself, buyers should budget for additional costs such as Stamp Duty Land Tax (where applicable), solicitor and conveyancing fees, mortgage arrangement fees, surveys, and removal costs, which together commonly add up to several thousand pounds.