Buying & selling

Down Payment Calculator

Calculate down payment, mortgage size, remaining cash to close and a savings shortfall or surplus.

What this calculator estimates

Calculate down payment, mortgage amount and cash required. It combines the inputs below to produce Down payment. Every assumption remains editable so the estimate can reflect the property, financing and location being evaluated.

Worked example

Using the displayed sample assumptions, the calculator produces $110,000. This is an illustration, not a market quote. Change one input at a time to understand what drives the result.

Inputs and assumptions

• Purchase price — sample input: 500000 currency units
• Down payment — sample input: 20 %
• Closing costs — sample input: 10000 currency units
• Prepaid tax / insurance — optional — sample input: 0 currency units
• Immediate repairs — optional — sample input: 0 currency units
• Deposit already paid — optional — sample input: 0 currency units
• Available savings — sample input: 120000 currency units
• Gift or assistance — optional — sample input: 0 currency units
• Cash to retain after closing — sample input: 10000 currency units
• Mortgage interest rate — sample input: 5 %
• Amortization — sample input: 25 years

How to interpret the result

Include immediate work and transaction costs in the decision. Compare a conservative case with an expected case and keep a record of the assumptions used.

Common mistake to avoid

Do not confuse purchase price with total cash required. Local definitions, taxes, lending practices and measurement requirements can materially change the result.

Related calculators

Reviewed 2026-09-08.