Rex says
Money math without the spreadsheet headache. Plug in your numbers and I'll show you exactly where the dollars land.
Try a scenario
Click to load — tweak from there.Inputs
Result
Cash needed at closing
$42,000
Loan amount
$378,000
Principal + interest
$2,389.22
Estimated PMI
$189.00
Applies below 20% down
Monthly total
$2,578.22
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How to use this
- 1Enter home price ($).
- 2Enter down payment (%).
- 3Enter interest rate (%).
- 4Enter term (years).
- 5Read your cash needed at closing on the right — it updates as you type.
- 6Hit Share to keep the scenario or send it to someone.
About this calculator
Enter a home price and a down payment percent to get the cash required, the loan amount, and the monthly principal and interest. Anything under 20% down normally triggers PMI, which this tool adds at a typical 0.6% annual rate.
Worked example
Using the values the calculator loads with:
Inputs
- Home price: 420000 $
- Down payment: 10 %
- Interest rate: 6.5 %
- Term: 30 years
Results
- Cash needed at closing: $42,000.00
- Loan amount: $378,000.00
- Principal + interest: $2,389.22
- Estimated PMI: $189.00
- Monthly total: $2,578.22
What each field means
Inputs
- Home price ($)
- The home price used in the calculation, measured in $. Starts at 420000 $ so you have a working example on load.
- Down payment (%)
- The down payment used in the calculation, measured in %. Starts at 10 % so you have a working example on load. Accepted range: 0–100 %.
- Interest rate (%)
- The interest rate used in the calculation, measured in %. Starts at 6.5 % so you have a working example on load.
- Term (years)
- The term used in the calculation, measured in years. Starts at 30 years so you have a working example on load.
Results
- Cash needed at closing
- Returned as a money amount in US dollars and shown as the headline result. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Loan amount
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Principal + interest
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
- Estimated PMI
- Applies below 20% down
- Monthly total
- Returned as a money amount in US dollars. It recalculates instantly whenever you change an input, so you can compare scenarios without reloading.
FAQ
How does the down payment calculator work?
Enter a home price and a down payment percent to get the cash required, the loan amount, and the monthly principal and interest. Anything under 20% down normally triggers PMI, which this tool adds at a typical 0.6% annual rate. The underlying maths is: Down payment = Price × Percent. Loan = Price − Down payment. PMI applies below 20% equity.
What do I need to enter?
4 values: home price, down payment, interest rate, and term. Each field starts with a sensible default, so you can change one number at a time and watch the result move.
What does the cash needed at closing result mean?
It is returned as a money amount in US dollars and updates live as you edit the inputs, so you can compare two or three versions of a scenario in a few seconds.
Is this calculator free, and do I need an account?
Yes, it's free, and no account is required. Nothing you type is stored on our servers — the maths runs entirely in your browser.
How accurate is the result?
It applies the standard formula exactly, so the arithmetic is precise. Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
Who is this tool for?
It's built for anyone comparing money scenarios before committing — budgeting a payment, sanity-checking a quote, or seeing what a change in rate or term actually costs.
Accuracy and limitations
- Results are estimates before tax, fees, and inflation unless an input explicitly covers them.
- Rates are treated as fixed for the whole period — variable-rate products will drift from this projection.
- This is educational maths, not financial advice. Check anything contractual with the lender or your accountant.
Related tools
Cite this calculator
Writing about this topic? Grab a citation — every link helps keep these tools free.
RevenueLab. (2026). Down Payment Calculator. Retrieved from https://www.revenuelab.fyi/toolbox/down-payment
<p>Source: <a href="https://www.revenuelab.fyi/toolbox/down-payment" target="_blank" rel="noopener">Down Payment Calculator — RevenueLab</a> (2026).</p>
Source: [Down Payment Calculator — RevenueLab](https://www.revenuelab.fyi/toolbox/down-payment) (2026).