Down Payment Calculator
How much you need up front, and what you will finance.
Your figures
Result
How to use this tool
- Enter your own figures over the defaults — Property price, Down payment.
- The answer updates as you type. There is no button, and nothing is sent anywhere.
- Change Down payment on its own to see how much it moves the result — the worked example below shows exactly that.
Below 20% down, most conventional lenders require private mortgage insurance, which adds to the monthly cost without building equity.
How it works
This takes 2 inputs — property price, down payment — and returns down payment, amount financed, loan-to-value ratio and private mortgage insurance likely?. The whole calculation happens in this page as you type: there is no submit button, no request, and nothing stored.
Because it recalculates on every keystroke you can use it as a sensitivity test rather than a one-shot answer. Moving down payment alone from 20 to 21 changes down payment from 70,000.00 to 73,500.00 — the worked example below sets that out in full.
A worked example
Worked through with the figures the page already has in it: property price of 350,000 and down payment of 20 %, giving down payment of 70,000.00. These numbers come from running the calculator’s own code, not from being typed in here, so they cannot drift away from what you see on screen.
Starting from:
- Property price: 350,000
- Down payment: 20 %
| Result | Value |
|---|---|
| Down payment | 70,000.00 |
| Amount financed | 280,000.00 |
| Loan-to-value ratio | 80.0% |
| Private mortgage insurance likely? | No |
What happens when one input moves
Holding everything else steady and changing Down payment from 20 % to 21 % — one percentage point — moves the answer like this:
| Figure | 20 % | 21 % |
|---|---|---|
| Down payment | 70,000.00 | 73,500.00 |
| Amount financed | 280,000.00 | 276,500.00 |
| Loan-to-value ratio | 80.0% | 79.0% |
| Private mortgage insurance likely? | No | No |
That is usually the number worth arguing over: it is easier to move than the headline amount, and the difference compounds across the whole term.
Down Payment Calculator — frequently asked questions
Why does 20% matter?
Below 20%, conventional loans generally require private mortgage insurance — an extra monthly cost that protects the lender, not you.
Can I put down less?
Yes. Many programmes allow 3–5%, and some government-backed loans allow zero. You pay for it through insurance premiums and a larger loan.
Does this include closing costs?
No. Closing costs typically add 2–5% of the purchase price and are payable on top of the deposit.
Is this calculator free?
Yes, with no account, no limits and no data collection. It runs entirely in your browser.
Should I rely on this for a financial or medical decision?
No. It is a planning estimate built on standard formulas and stated assumptions. For decisions that matter, speak to a qualified professional who can account for your full circumstances.
How accurate is the Down Payment figure?
The arithmetic is exact. With the defaults on this page — property price 350000, down payment 20 % — it returns down payment of 70,000.00. What limits accuracy is the assumptions, not the maths: change down payment to 21 % and the same formula gives 73,500.00. Treat it as a well-founded estimate, not a quotation.
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Background reading: Loan, Mortgage and Investment Calculators Explained
Nothing is sent anywhere. The figures you type stay in this page and are never transmitted or stored — how that works.
Disclaimer. The formula is exact; the answer is only as good as the figures and assumptions above. Not financial, tax, medical or legal advice. Full disclaimer.