Example result based on the prefilled values.
Target Deposit
$30,000.00
Time to Save
1.00 years 11.00 months (23.00 months total)
Continue your plan
Useful next calculations
When to use this calculator
- Before comparing lenders, brokers, or repayment options.
- When you want to test how a different deposit, rate, or term changes affordability.
- When you need a quick estimate before using a formal quote or agreement in principle.
- When you are stress-testing your budget against a potential rate rise to see the impact on monthly payments.
- When you want to understand the full cost of borrowing — not just the monthly figure — before you commit.
A realistic US planning example
Use these sample inputs as a quick scenario test, then change one variable at a time to compare outcomes.
Target House Price ($)
$0.30
Deposit Required (%)
$70,000
Current Savings ($)
$15,000
Monthly Savings ($)
$15,000
After entering these figures, review target deposit and time to save together rather than in isolation — each metric tells a different part of the story. Then rerun the tool with one input adjusted to see which variable has the biggest effect on all three outputs before you settle on a plan.
How to read your results
Target Deposit
Use this metric to compare scenarios side by side and understand how changes in the key inputs drive the final outcome. If the figure surprises you, isolate one variable at a time and rerun the calculation to identify which assumption is responsible.
Time to Save
Use this metric to compare scenarios side by side and understand how changes in the key inputs drive the final outcome. If the figure surprises you, isolate one variable at a time and rerun the calculation to identify which assumption is responsible.
Method & assumptionsAuthoritative sources
This calculator shows how a regular monthly contribution, combined with an initial lump sum and assumed interest rate, will grow toward a savings target over time. It applies compound interest, assuming interest is calculated and added monthly, which reflects how most UK savings accounts operate. The Lifetime ISA bonus — where applicable — is not automatically included in the base calculation; you should factor it in separately if you are using a LISA as part of your savings strategy. Inflation is not deducted from the projected total, so the real purchasing power of your savings may be lower than the nominal figure shown if inflation is significant over the period. This tool provides an illustrative projection and should be used alongside advice from a qualified financial adviser for major purchase planning.
Common mistakes
- !Using an assumption that is not supported by a current local quote, bill, statement or official source.
- !Treating a generic estimate as a lender, provider, payroll or tax authority decision.
- !Mixing monthly and annual inputs without converting them consistently.
- !Forgetting location-specific taxes, fees, eligibility rules or payroll deductions where they apply.
- !Testing only one scenario instead of checking how a cautious assumption changes the result.
What to do next
- Run a second scenario with a cautious assumption so you can see the downside clearly.
- Compare the result with the related calculators below before making a decision.
- Check current local rules, eligibility and provider terms before applying or committing money.
- Keep a record of the assumptions so you can update the estimate when a quote, bill or pay figure changes.
- Use the result to prepare better questions for a lender, provider, adviser or employer rather than treating it as a final answer.
Frequently asked
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