Quick guide
How to use this calculator
- Enter amounts from the same property scenario and use consistent periods and units.
- Use visitor-entered rates and allowances from your own documents rather than assuming a local rule.
- Review the component results and the calculator-specific decision boundary before acting.
Calculation method
Calculation method
Each month compounds current savings, adds the end-of-month contribution, and changes the target by the entered target-cost rate until savings reach the target.
Entered fixed decimals remain exact through rational arithmetic. Planar distance outputs that require square roots use bounded numerical evaluation. Values round only for display, and unsupported or undefined states return an explicit message.
Worked example
Worked example
Starting with 20,000 and adding 1,500 monthly reaches a fixed 50,000 target in 20 months; optional rates can stress the timeline.
Each month compounds current savings, adds the end-of-month contribution, and changes the target by the entered target-cost rate until savings reach the target.
Supported inputs
Precision and limits
International scope
No currency, market price, interest rate, tax, tenancy rule, planning code, lender policy, or measurement definition is supplied automatically.
Scenario, not a decision
Results are arithmetic scenarios from visitor-entered values—not an appraisal, loan approval, legal interpretation, planning determination, forecast, or professional recommendation.
Precision and privacy
Inputs accept bounded plain decimals and remain in this browser. The engine prevents invalid denominators and misleading non-finite results.
Calculator-specific boundary
Optional rates are scenarios, not forecasts. Contributions are added at month end; tax, fees, changing contributions, and abrupt price changes are excluded.
Continue calculating