How to read your result
Three numbers do most of the work here.
Down payment in dollars. The percentage sounds abstract until you see it. On a $350,000 home, 3% is $10,500 and 20% is $70,000. That gap is often the difference between buying this year and buying in four.
Loan amount. Home price minus down payment. This drives your monthly payment and your total interest over the life of the loan.
Mortgage insurance. Put down less than 20% on a conventional loan and you'll typically pay private mortgage insurance (PMI), usually somewhere between 0.3% and 1.5% of the loan amount per year, split into monthly payments. It drops off once you reach 20% equity. FHA loans use their own version, called MIP, with different rules.
The 20% question
Twenty percent avoids PMI and usually gets you a slightly better rate. It is not required, and waiting years to reach it while home prices and rents rise can cost more than the PMI would have. Many buyers do better putting 5% to 10% down, keeping cash in reserve for closing costs, repairs, and moving, and dropping PMI later.
There's no universally right answer. The calculator exists so you can see both paths in real dollars and decide which one fits your life.
Don't forget closing costs
Your down payment is not the only cash you'll need at closing. Closing costs (lender fees, title, appraisal, prepaid taxes and insurance) typically run 2% to 5% of the purchase price. On a $350,000 home, that's another $7,000 to $17,500. Some of that can be negotiated into seller credits, and some programs allow gifts from family, but budget for it now so it doesn't surprise you later.
A quick example
Home price: $350,000.
3% down ($10,500): Loan of $339,500. PMI likely required. Lowest cash to close.
10% down ($35,000): Loan of $315,000. PMI still required but often at a lower rate. Monthly payment drops noticeably.
20% down ($70,000): Loan of $280,000. No PMI. Lowest monthly payment, but $59,500 more cash out of pocket than the 3% option.
Which one is right depends on what else that $59,500 could do for you, and how long you plan to stay in the home.
What to do with your number
Plug the loan amount into the Mortgage Payment Calculator to see the full monthly cost with taxes, insurance, and PMI.
Not sure the price is right for your income? Back up a step with the Home Affordability Calculator.
If you qualify for a federal program, your minimum down payment may be lower than you think. Checking your rate with Yellow runs those matches automatically.