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Down Payment Target & Saving Duration

Connect purchase price, loan amount and down-payment target, then estimate how long constant monthly savings take to fill the remaining gap.

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Calculator inputs

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How to use this calculator

  1. Enter the known values in the units shown. Results update as you type.
  2. Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
  3. Use the worked example to check the method. Reset restores the starting fields.

Use the result with context

Results are estimates for planning and education. Confirm rates, taxes, fees, and legal requirements with the relevant institution or a qualified professional before making a financial decision.

Formula and method

For a 100,000 purchase and 20 percent down payment, the target is 20,000 and the loan is 80,000. With 8,000 already saved and 1,000 saved monthly, the gap takes twelve months.

Loan = purchase price − down payment; saving time = (down payment − current savings)/monthly savings

Worked example

Enter these known values and leave the other values blank.

Purchase price
100000 USD
Target share of purchase price
20 %
Savings assigned to this target
8000 USD
Amount saved each month
1000 USD
Loan amount after down payment
80000 USD
Down-payment target
20000 USD
Continuous saving duration
1:0 yrs / mos

Assumptions and limitations

  • Purchase price is positive; down payment ranges from zero to the full purchase price. This does not determine lender eligibility or a required down payment.
  • Current savings assigned to the target range from zero to the target. If you have surplus savings, enter only the portion assigned to this target.
  • Monthly savings are positive and constant, with no savings interest, withdrawals, inflation or changing purchase price. A reached target takes zero further time.
  • A fractional duration is a continuous estimate. If deposits occur only once per month, round up to the next whole deposit count. Duration units use fixed conversion factors.

Common questions

What if I already have the full down payment?

Enter current savings equal to the target. The remaining saving duration is zero.

Does this include closing costs?

No. This target covers only the down payment; add other purchase costs to a separate savings plan.

References

Bookify permits zero down payment, a fully funded target and an all-cash purchase, while keeping savings within the chosen target and percentages within zero to 100 percent.

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