Find how much you can borrow from the monthly payment you can afford at your rate and term, and the price your down payment then buys.
更新日 検証済みの例：4
A payment of $1,500.00 a month for 240 months supports a loan of $186,198.20; with your down payment that buys up to $236,198.20. Of the $360,000.00 you pay in total, $173,801.80 is interest.
| 月 | 支払額 | 元金 | 利息 | 残高 |
|---|---|---|---|---|
| 1 | $1,500.00 | $336.26 | $1,163.74 | $185,861.94 |
| 2 | $1,500.00 | $338.36 | $1,161.64 | $185,523.57 |
| 3 | $1,500.00 | $340.48 | $1,159.52 | $185,183.09 |
| 4 | $1,500.00 | $342.61 | $1,157.39 | $184,840.49 |
| 5 | $1,500.00 | $344.75 | $1,155.25 | $184,495.74 |
| 6 | $1,500.00 | $346.90 | $1,153.10 | $184,148.84 |
| 7 | $1,500.00 | $349.07 | $1,150.93 | $183,799.77 |
| 8 | $1,500.00 | $351.25 | $1,148.75 | $183,448.52 |
| 9 | $1,500.00 | $353.45 | $1,146.55 | $183,095.07 |
| 10 | $1,500.00 | $355.66 | $1,144.34 | $182,739.42 |
| 11 | $1,500.00 | $357.88 | $1,142.12 | $182,381.54 |
| 12 | $1,500.00 | $360.12 | $1,139.88 | $182,021.42 |
This is the EMI formula solved for the loan amount.
This works the EMI formula backwards. Given the monthly payment you can afford, the largest loan it repays is P = M × (1 − (1 + r)^−n) ÷ r, where r is the monthly rate and n the number of payments; this is what Excel's PV function returns. Adding your down payment gives the highest price you can pay.
With the defaults, 1,500 a month for 20 years at 7.5% supports a loan of 186,198.20, and 50,000 down lifts the price you can afford to 236,198.20. The 240 payments total 360,000.00, of which 173,801.80 is interest.
The result is the ceiling your budget sets. Lenders also limit the payment by your income through the debt-to-income ratio, and property tax, insurance and fees come out of the same monthly budget.
照合元：Microsoft PV function documentation example: PV(0.08/12, 12*20, 500) = −59,777.15
照合元：Python decimal (prec 50) present value of an ordinary annuity
照合元：M × n when there is no interest
照合元：1010 / 1.01 by hand
Multiply the payment by the annuity factor (1 − (1 + r)^−n) ÷ r. At 8% over 20 years, r = 0.08 ÷ 12 and n = 240, so the factor is 119.55 and a payment of 500 a month supports a loan of 59,777.15. Microsoft's documentation for Excel's PV function gives the same figure for PV(0.08/12, 240, 500).
In the US, the CFPB suggests keeping total debt payments at 36% of gross monthly income or less and housing costs at 28% to 35%, though some lenders go to 43% or higher. Fannie Mae's standard maximum is 36%, rising to 45% with credit-score and reserve requirements and to 50% for loans underwritten through Desktop Underwriter. On a gross income of 5,000 a month, 36% is 1,800.
A higher rate means more of each payment goes to interest, so the same payment supports a smaller loan. Over 20 years, 1,500 a month supports 201,187.51 at 6.5%, 186,198.20 at 7.5% and 172,846.26 at 8.5%: each percentage point costs about 7% of the loan. The chart shows the full curve for your payment and term.
Yes, but with diminishing returns and much more interest. At 7.5%, 1,500 a month supports 161,810.14 over 15 years, 186,198.20 over 20 years and 214,526.44 over 30 years. Going from 20 to 30 years adds 28,328.24 of borrowing but raises total interest from 173,801.80 to 325,473.56.
精度は入力値と計算方法の前提に依存します。十進演算には有効数字50桁を使いますが、推定、数値計算手法、元データの精度はそれより低い場合があります。表示の丸め処理でこれらの制約がなくなるわけではありません。 独立した出典の解答と照合した計算例：4。 例えば、「500 a month for 20 years at 8%」はMicrosoft PV function documentation example: PV(0.08/12, 12*20, 500) = −59,777.15と照合しています。
Microsoft Excel PV function; Consumer Financial Protection Bureau — Debt-to-income ratio.
計画の参考用です。金融機関、税務当局、市場は独自の丸め方、手数料、規則を適用します。契約などの前に該当機関へ金額を確認してください。
この計算機には、独立した出典の解答を使った計算例が 4 件あります。テストに組み込まれており、ここでも実行できます。
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固定資産税、保険、住宅所有者協会費（HOA）、民間住宅ローン保険（PMI）を含む月額と、返済予定表や追加返済による節約額を試算します。
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