Free House Down Payment Calculator for Google Sheets

For a lot of people, the whole idea of buying a house lives or dies on one terrifying number: the down payment. It sits there in your head as a vague, enormous, six-figure wall, so most people never actually calculate it. They just assume it is impossible and move on.

It gets far less scary once you do two things: figure out exactly what you need, and divide it by the months you have to get there. Break a down payment into a monthly savings number and the impossible-looking wall turns into a simple yes-or-no: this amount fits your budget, or it does not fit yet.

I built a free house down payment calculator in Google Sheets that does both for you. Type in the home price, your target down payment percent, and when you want to buy, and it hands you the single monthly number that gets you to the closing table. Copy it and find out where you actually stand.

Jump to a section

• What really goes into the cash to buy a house
• How big should your down payment be?
• How the calculator turns it into a monthly number
• Where to keep a down payment fund
• Making the monthly number real

What really goes into the cash to buy a house

Most first-time buyers plan for the down payment and then get ambushed at the finish line by closing costs. So the calculator asks for both.

The down payment is the chunk of the price you pay up front, written as a percent. Closing costs are the fees to actually complete the purchase (lender fees, title, appraisal, taxes, and the rest), and they usually run about 2 to 5 percent of the home price on top of your down payment. Add the two together and you get the real figure: total cash to close. That is the number your savings has to reach, and it is the one the calculator builds your monthly target around instead of the down payment alone.

Two more costs are worth knowing, even though the calculator keeps things simple on purpose. Earnest money is a deposit you put down when your offer is accepted, and it usually counts toward your total cash at closing rather than adding to it. And if you are a first-time buyer, check your state and city for down payment assistance programs before you lock in your percent, because a grant or forgivable loan can shrink the number you actually have to save on your own.

How big should your down payment be?

There is no single right answer, which is exactly why the percent is yours to set. A few common landmarks:

• 3 to 5 percent: the low end, available through many conventional and FHA loans. It gets you in the door sooner, but you will pay private mortgage insurance (PMI) until you build enough equity.
• 10 percent: a middle path that shrinks both your loan and your PMI without demanding the full twenty.
• 20 percent: the classic target, because it usually lets you skip PMI entirely and lowers your monthly mortgage payment.

Put your real target price and a percent into the calculator and watch the monthly number move. Seeing that a 20 percent down payment means saving $1,500 a month while 10 percent means $800 is often what helps you pick a plan you can actually live with. For the wider view of the whole savings push, here are proven ways to save money faster and free up more for the goal.

How the calculator turns it into a monthly number

The math itself is not complicated, but doing it in your head is where motivation goes to die. So the sheet handles it. It multiplies the price by your down payment percent, adds your estimated closing costs, and subtracts what you have already saved, which leaves your remaining goal. Then it counts the months between today and your target purchase date, and divides.

What you get is the gold number: save this much each month, and you arrive with the cash you need on the date you picked. If that number feels too high, you have three real levers to pull, all sitting right there in front of you: lower the price, lower the down payment percent, or push the date out. Adjust any one of them and your monthly target updates instantly, so you can find the version of the plan that fits your real life. A number that fits is worth more than an ambitious one you abandon in March.

Where to keep a down payment fund

A down payment is short-to-medium-term money, so where you keep it depends on your timeline. If you plan to buy within about three years, safety wins: a high-yield savings account keeps the money liquid and earning interest with no risk of it dropping right before you need it. Here is how a high-yield savings account works if you want the details.

If your target is further out, say five years or more, some buyers add conservative investments to the mix to fight inflation. That is a personal call and beyond what one blog post can decide for you. The one rule almost everyone agrees on: do not gamble your near-term down payment in the stock market, because a single bad year could reset your timeline by a lot. Treat this as general education rather than advice for your exact situation, and weigh it against your own plans. Feeding this goal from a budget you will actually keep helps too, and here is how to build one.

Making the monthly number real

A down payment stops being scary the moment it becomes a single line in your budget. Copy the calculator, plug in the house you actually want and the date you actually want it, and meet your monthly number. If it fits, automate the transfer and forget about it. If it does not, pull the levers until it does. Either way, you trade a foggy dread for a concrete plan, and that swap is most of the battle.

What is your target down payment number, and when do you want to be holding the keys? Tell me in the comments, I love a good house goal.

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Who wrote this

Robby Naka writes The Millennial Budget, a no-shame take on money for people who want a great life now and later. He’s not a financial advisor, just a guy a little obsessed with spending on purpose and figuring out his own kind of rich. More about Robby. This article is general education, not financial or tax advice for your situation.