A down payment calculator cannot tell you whether a lender will approve your loan or whether you can definitely afford a home. It converts the cash goal you enter into an estimated monthly savings amount.
Information to prepare
- The target home price, or the price range you are comparing
- The savings you intend to use for the down payment, kept separate from emergency savings
- The time remaining before you plan to buy
- Additional costs for the contract, transfer, moving in, and necessary work
- The cash reserve you want to retain after the purchase
A basic formula
Monthly savings target = (target down payment + planned home-buying costs − existing home fund) ÷ months remaining. If the result is negative, check whether emergency savings were mistakenly included in the home fund. If the monthly amount is too high, consider a lower home-price range, a longer timeline, or a revised goal.
Test different scenarios
Recalculate if the purchase date moves by 6 or 12 months, initial costs rise, or you save less than planned in some months. Do not count uncertain investment returns as guaranteed down payment money.
Assess mortgage payments separately
Having enough for a down payment does not mean the monthly instalment is affordable. Prepare a monthly budget that includes essential costs, existing debt, and expenses for the new home. The Bank of Thailand recommends reviewing what remains after expenses and debt, as well as the down payment, interest rate, and loan term before buying. See its home-loan guidance.
Use the calculator’s result as a savings target to monitor and adjust. It is not a loan approval, borrowing limit, or a home price that is suitable for everyone.
About the referenced video: The linked video discusses investing in NASDAQ over time; it does not explain down payment planning and does not support the calculator’s figures.