Down Payment Calculator

Calculate the down payment needed for your home purchase. See how different down payment amounts affect your monthly mortgage.

What Is a Down Payment Calculator?

A down payment calculator determines how much money you need to save for a home purchase and how long it will take to reach your goal. It takes the home price and your desired down payment percentage to calculate the dollar amount needed, then factors in your current savings, monthly savings rate, and savings account interest to project a timeline.

Understanding down payment requirements early in the home-buying process helps you set realistic savings goals and choose the right loan program. The calculator also compares common down payment scenarios so you can see how different percentages affect your upfront costs and ongoing mortgage obligations.

How the Math Works

The basic calculation is straightforward: Down Payment = Home Price x Down Payment Percentage. For a $350,000 home at 20%, the down payment is $70,000.

The savings timeline calculation is more nuanced. Each month, your savings balance grows by your monthly deposit plus interest earned on the existing balance. With a high-yield savings account at 4.5% APR, the interest accelerates your progress slightly each month.

The calculator also shows the loan amount (home price minus down payment), which directly affects your monthly mortgage payment, total interest paid, and whether PMI is required.

How to Use This Calculator

Enter the home purchase price. Use a realistic estimate based on homes in your target area and price range.
Set the down payment percentage. The standard is 20% to avoid PMI, but enter whatever percentage your loan program requires or you are targeting.
Enter your current savings. This is how much you have already set aside toward the down payment.
Set your monthly savings. Enter the amount you can consistently save each month toward this goal.
Enter your savings account rate. Use the APY of your high-yield savings account for the most accurate timeline projection.

Worked Examples

Example 1: First-Time Buyer with 20% Target

Home price $300,000, target 20% ($60,000). Current savings $15,000, monthly savings $1,200, savings rate 4.5%. Still needed: $45,000. Time to save: approximately 3 years 2 months. Interest earned during savings: about $3,100.

Example 2: FHA Minimum Down Payment

Home price $250,000, target 3.5% ($8,750). Current savings $3,000, monthly savings $800, savings rate 4%. Still needed: $5,750. Time to save: approximately 7 months. The lower down payment means a faster timeline but adds MIP to the monthly mortgage payment.

Example 3: Already Saved Enough

Home price $400,000, target 10% ($40,000). Current savings $50,000. The calculator shows you already have enough for a 10% down payment with $10,000 to spare for closing costs and moving expenses.

Example 4: Aggressive Savings Plan

Home price $500,000, target 20% ($100,000). Current savings $25,000, monthly savings $3,000, savings rate 5%. Time to save: approximately 2 years 1 month. Interest earned: about $4,200. Aggressive monthly savings dramatically shortens the timeline.

Common Use Cases

Goal setting: Determine exactly how much you need and create a concrete monthly savings target.
Timeline planning: Know when you will be ready to buy so you can plan the rest of the process accordingly.
Scenario comparison: Compare 5%, 10%, and 20% down payment options to decide which balances upfront cost against ongoing PMI expense.
Savings strategy: See how increasing your monthly savings by even a few hundred dollars affects the timeline.

Tips and Common Mistakes

Do not forget closing costs. Beyond the down payment, budget 2 to 5 percent of the home price for closing costs. On a $350,000 home, that is $7,000 to $17,500 additional cash needed at closing.

Avoid depleting all savings. Keep reserves for moving costs, immediate repairs, and emergencies. A good rule is to have 3 to 6 months of expenses in addition to the down payment.

Consider the PMI break-even. Paying 20% down to avoid PMI costs more upfront but saves money monthly. Calculate how many months of PMI the extra down payment eliminates to find the break-even point.

Start saving in a dedicated account. Keeping down payment savings separate from everyday checking prevents accidental spending and makes progress easier to track.

Frequently Asked Questions

How much should I put down on a house?

The ideal down payment depends on your financial situation and loan type. Putting 20% down avoids private mortgage insurance (PMI) and gives you immediate equity. However, many buyers start with 5-10% down on conventional loans or 3.5% on FHA loans. The trade-off is between a smaller upfront cost and higher monthly payments due to PMI and a larger loan balance.

What is PMI and how much does it cost?

Private Mortgage Insurance (PMI) is required when your down payment is less than 20% of the home's purchase price. It typically costs 0.3% to 1.5% of the original loan amount per year, added to your monthly mortgage payment. On a $300,000 loan, PMI might cost $75 to $375 per month. PMI can be removed once you reach 20% equity in the home.

Can I use gift money for a down payment?

Yes, most loan programs allow gift funds for down payments. Conventional loans require a gift letter stating no repayment is expected. FHA loans accept gifts from family, employers, or approved organizations. The donor must provide documentation showing the funds are a gift. Some loan programs require the buyer to contribute a minimum amount from their own funds alongside the gift.

What first-time buyer programs reduce down payment needs?

FHA loans require only 3.5% down. VA loans for veterans require zero down payment. USDA loans for rural areas also require zero down. Many states offer down payment assistance programs with grants or forgivable loans. Some conventional loans allow as little as 3% down for first-time buyers. Check your state's housing finance agency for local programs.

Should I use my emergency fund for a down payment?

Generally no. Homeownership brings unexpected expenses like repairs, appliance replacements, and maintenance. Keep at least 3 to 6 months of expenses in reserve after closing. If using emergency savings for the down payment leaves you with less than this, consider a smaller down payment, waiting longer to save, or looking at less expensive properties.

How does a larger down payment benefit me?

A larger down payment reduces your loan amount, lowering both your monthly payment and total interest over the life of the loan. It eliminates or reduces PMI costs. It gives you instant home equity, providing a financial cushion if property values decline. It also makes you a more competitive buyer since sellers see a larger down payment as a sign of financial strength.

Where should I save for a down payment?

High-yield savings accounts offer safety and liquidity with current rates around 4 to 5 percent. Money market accounts provide similar returns with check-writing ability. Short-term CDs lock in rates for fixed periods. Avoid stocks or volatile investments for near-term savings goals since you cannot afford to lose principal right before a home purchase.

How long does it take to save for a down payment?

The timeline depends on the home price, target percentage, your current savings, and monthly savings rate. For a $350,000 home with 20% down ($70,000), saving $1,000 per month starting from zero takes about 5 to 6 years including interest earned. Increasing monthly savings to $2,000 cuts that to about 3 years. This calculator shows your specific timeline based on your inputs.