Down Payment Calculator
Find out how much you need to save for a down payment and build a realistic savings plan with interest projections.
How to Use This Down Payment Calculator
This calculator has two modes to help you plan your home purchase:
Down Payment Needed Tab
Enter the Home Price and your target Down Payment % to instantly see the cash required. The calculator also estimates closing costs (roughly 2โ3% of the purchase price) so you know your total cash needed at closing. Click any row in the PMI comparison table to see how different down payment levels affect your monthly PMI costs โ clicking 20% confirms you'll have no PMI at all.
Savings Plan Tab
Enter your Down Payment Target, Current Savings, Monthly Savings, and the interest rate your savings account earns. The calculator shows exactly how many months it will take to reach your goal, how much interest you'll earn along the way, and milestone checkpoints at 25%, 50%, 75%, and 100% of your target.
Down Payment Formula and Calculation
Loan Amount = Home Price โ Down Payment
LTV = Loan Amount รท Home Price
Savings Growth (with interest):
FV = PV ร (1 + r)^n + PMT ร [(1 + r)^n โ 1] / r
Where:
FV = Future value (savings goal)
PV = Present value (current savings)
r = Monthly interest rate (annual rate รท 12)
n = Number of months
PMT = Monthly savings contribution
PMI is typically calculated as an annual percentage of the original loan amount, divided by 12 for the monthly cost. Rates range from 0.3% to 1.5% annually depending on your credit score, loan type, and LTV ratio.
Example: Saving for a $350,000 Home
Maria's Down Payment Plan โ Denver, CO
Maria wants to buy a $350,000 condo in Denver and avoid PMI with a 20% down payment. She currently has $10,000 saved and can save $1,500/month in a 4.5% HYSA.
| Home Price | $350,000 |
| Down Payment Target (20%) | $70,000 |
| Current Savings | $10,000 |
| Monthly Savings | $1,500 |
| Savings Rate (HYSA) | 4.5% |
| Time to Goal | ~3 years 5 months |
| Interest Earned | ~$2,800 |
| Est. Closing Costs | ~$8,750 |
| Total Cash Needed at Closing | ~$78,750 |
If Maria chose to put down only 10% ($35,000), she'd reach her goal about 19 months sooner but would pay roughly $170/month in PMI until she builds 20% equity โ totaling over $6,000 in PMI before cancellation.