House Down Payment Cost Calculator and Guide

This house down payment calculator estimates the cash down payment from a home price and the percentage you plan to put down. Enter those two figures to see the down payment amount and the mortgage principal left before other costs are considered.

Formula

Down payment = home price × down payment percentage ÷ 100. The amount remaining before other costs = home price − down payment.

• Home price (price): the agreed or assumed property price, in dollars.
• Down payment percentage (pct): the portion of the price paid upfront, as a percentage from 0 to 100.
• House down payment (down): the calculated upfront portion, in dollars.
• Price remaining (remain): the price not covered by the down payment, in dollars. It is not necessarily the final loan amount.

This is a simple percentage calculation, not a loan approval or mortgage-payment calculation. The percentage is an input: the calculator does not select a required or suitable amount for you.

Worked Example

Using the calculator’s default home price of $350,000 and down payment percentage of 10%:

1. Convert the percentage to a decimal: 10 ÷ 100 = 0.10.
2. Multiply the price by that decimal: $350,000 × 0.10 = $35,000.00 down.
3. Subtract the down payment from the price: $350,000 − $35,000 = $315,000.00 remaining before other costs.

The calculator’s headline result is $35,000.00.

Assumptions

• The entered home price is the basis for the percentage calculation.
• The down payment is treated as a single upfront amount; no payment timing or interest compounding is modelled.
• The price remaining is a simple subtraction, not an estimate of a final mortgage balance.
• Closing costs, taxes, insurance, mortgage insurance, escrow, fees, grants, and other credits are not included.

What a Down Payment Covers

A down payment is the part of a home’s purchase price paid upfront rather than financed through a mortgage. For example, at a $350,000 price and a 10% down payment, the calculation gives $35,000 upfront and $315,000 of price not covered by that amount. If a mortgage finances all of the remainder, its starting principal could be $315,000, but actual transaction details can make the loan amount different.

A down payment is only one part of the cash needed to buy a home. Buyers may also need to account for closing costs and other expenses, and the timing and amount of those costs depend on the transaction. The calculator deliberately excludes them so its result remains a clear percentage of the entered price.

How to Choose a Percentage to Calculate

There is no single percentage that applies to every purchase. A useful way to explore the arithmetic is to enter several possible percentages and compare the resulting upfront amounts and remaining price. A larger percentage means more cash paid against the price and a smaller remainder; it does not, by itself, establish what a lender will require or what a household should pay.

• Start with the price you want to test. Use the purchase price assumption relevant to your calculation. A change in price changes the dollar amount even if the percentage stays the same.
• Enter a percentage from 0 to 100. For instance, 5 means five percent, not 0.05. The calculator divides the entered number by 100.
• Compare scenarios consistently. Keep the price fixed while changing the percentage, or keep the percentage fixed while comparing prices, so you can see what drives the difference.
• Set aside other purchase cash separately. The down payment result should not be mistaken for a complete estimate of cash to close or total housing costs.

Common Misunderstandings and Limits

A common mistake is to treat the amount remaining after the down payment as the exact mortgage balance. It is only the portion of the stated price not covered by the down payment. The actual mortgage principal may differ because of transaction arrangements, financed costs, credits, or other items. The calculator has no inputs for those details.

Another misconception is that one percentage automatically determines mortgage insurance, a fee, an interest rate, or eligibility. This calculator models none of those outcomes. Requirements and costs can depend on the particular loan and transaction; obtain relevant figures from the lender and other parties to the purchase. It does not calculate monthly payments, interest over time, cash-to-close, or whether a particular purchase is financially suitable.

Check that the price and percentage are entered in the intended fields. The price is in dollars, and the percentage is entered as a whole percentage number. The result is rounded to cents for display; calculations involving real contracts may use their own rounding and settlement conventions.

Frequently Asked Questions

How much is a 20% down payment on a $300,000 house?
Multiply $300,000 by 0.20: the down payment is $60,000. The price remaining before other costs is $240,000.

How do I calculate a house down payment?
Multiply the home price by the down payment percentage and divide by 100. For example, 10% of $350,000 is $350,000 × 10 ÷ 100 = $35,000.

Does the down payment include closing costs?
No. A down payment is the portion applied to the purchase price. Closing costs and other transaction expenses are separate and are not calculated here.

Is the amount left after the down payment my mortgage amount?
It is the home price minus the down payment, before other costs or transaction details. It may be a useful starting estimate, but it is not necessarily the final loan principal.

Can I enter 0% or 100%?
Yes. The calculator accepts percentages from 0 through 100. At 0%, the calculated down payment is $0; at 100%, it equals the entered home price.

The result is an estimate for education; the lender’s disclosure gives the exact figures.

Related

• Estimated House Payment Per Month Calculator
• Down Payment Budget Calculator and Planning Guide
• Estimated House Payment Budget Calculator

in price | Home price | $ | 350000 | 0 | 1000000000
in pct | Down payment percentage | % | 10 | 0 | 100
out down | House down payment | $ | price * pct / 100 | 2
out remain | Price remaining before other costs | $ | price - down | 2