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Calcimator

Home Down Payment Calculator

Calculate how much you need for a down payment and how long it will take to save. See the impact of interest earned in a high-yield savings account.

About this calculator

This calculator turns a home-buying goal into a concrete savings plan. Down Payment Target is simply Home Price multiplied by Down Payment %, and Remaining to Save is that target minus whatever you've already set aside in Current Savings (floored at zero once you've hit the target). From there, Months to Goal projects forward month by month: your existing balance grows at the Savings Account Rate (compounded monthly) while your Monthly Contribution is added each period, and the calculator counts how many months it takes for that growing balance to reach the down payment target -- capped at 100 years as a safety limit for pathological inputs like a $0 contribution toward a large target.

Interest Earned reports the portion of the final balance that came from compounding rather than from your own contributions, which is the concrete payoff of parking down-payment savings in an interest-bearing account instead of cash. The 20% Down Payment % default reflects the common threshold for avoiding Private Mortgage Insurance (PMI) on a conventional loan, but several loan programs allow much less -- FHA loans permit as little as 3.5% down, and some conventional and VA programs go lower still, so adjust the percentage to match the specific loan program you're planning around rather than assuming 20% is required.

Inputs

$
%
$
$
%

Results

Down Payment Target

$80,000.00

Remaining to Save$65,000.00
Months to Goal39
Interest Earned While Saving$6,725.12
How to Use This Calculator
  1. Enter the home price you are targeting.
  2. Set the down payment percentage — 20% avoids PMI; FHA loans allow 3.5%.
  3. Enter your current savings already set aside toward the down payment.
  4. Set your monthly contribution to this goal.
  5. Enter the savings account interest rate (high-yield savings accounts currently offer 4-5% APY).
  6. Review the down payment target, remaining to save, months to goal, and interest earned while saving.

How the result changes with Home Price

Home PriceDown Payment Target
$200,000.00$40,000.00
$300,000.00$60,000.00
$600,000.00$120,000.00
$1,000,000.00$200,000.00

What each input means

Home Price
Target purchase price of the home you want to buy.
Down Payment %
Percentage of home price for down payment. 20% avoids PMI; some loans allow 3-5%.
Current Savings
Amount you have already saved toward the down payment.
Monthly Contribution
How much you can put toward your down payment fund each month.
Savings Account Rate
Annual interest rate on your savings account.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    5 parameters
    Home Price = 400000, Down Payment % = 20, Current Savings = 15000, Monthly Contribution = 1500, Savings Account Rate = 4.5 = 5 input(s) provided
  2. Calculate Down Payment Target
    Down Payment Target
    80000 = $80,000
  3. Calculate Remaining to Save
    Remaining to Save
    65000 = $65,000
  4. Calculate Months to Goal
    Months to Goal
    39 = 39

Engine last updated . Checked against 2 independently-derived tests — how we verify calculators. Built by Paul Gunder, a software engineer, not a licensed financial, medical, or legal professional.

Frequently Asked Questions

Why does the calculator default to a 20% down payment?

20% is the common threshold for avoiding Private Mortgage Insurance (PMI) on a conventional mortgage, which is why it's a widely used planning benchmark -- but it isn't a universal requirement. FHA loans permit down payments as low as 3.5%, and some conventional and VA loan programs allow even less, so if you're planning around a specific loan product, set Down Payment % to match that program's actual minimum rather than defaulting to 20%.

How does the Savings Account Rate affect Months to Goal?

A higher rate means your existing balance and each month's growing balance earn more interest, so a larger share of the down payment target gets covered by compounding rather than by your own contributions -- this shortens Months to Goal, though the effect is modest for typical savings-account rates and short timelines, since compounding needs both a meaningful rate and time to make a large difference. It matters most when Current Savings is large relative to Monthly Contribution.

Why does Remaining to Save floor at zero instead of going negative?

If Current Savings already meets or exceeds the Down Payment Target, there's nothing left to save toward the goal, so Remaining to Save reports zero rather than a negative number that would have no real meaning here. In that case Months to Goal is also zero, since the target is already met.

Does increasing Monthly Contribution always reduce Months to Goal?

Yes, holding the other inputs fixed -- a larger monthly contribution adds more to the balance every period, so the growing balance reaches the down payment target sooner regardless of the savings rate. The relationship isn't perfectly linear because compounding interest also plays a role, but the direction always holds: more saved each month never lengthens the timeline.

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