Payment calculator

如何使用Payment calculator

它计算什么，何时使用

Solves a fixed-rate loan件whichever number 是 unknown: the payment, the amount you can borrow, the time 至 repay 或 the interest rate.

使用步骤

1. Choose what 至 work out.
2. the other 箱. 的 Fill
3. Read the answer 和 总计 利息.

各输入项的含义

• Loan 数量, 每月 payment, 利率, 期限 – Three 第 these four are needed; the four 次 是 the answer.

如何阅读结果

• The answer – Payment, borrowing 功率, 时间 或 利率.
• 总利息 – Payments minus the 数量 借款额.

公式

Payment = P × r ÷ (1 − (1 + r)^−n). Borrowing = payment × (1 − (1 + r)^−n) ÷ r. 时间 n = −ln(1 − P × r ÷ payment) ÷ ln(1 + r). The 利率 是 found numerically.

计算示例

20,000 at 6% over 5 years requires a payment 386.66 和 interest. 的 costs 3,199.36

假设与局限

• Fixed 利率 和 equal 每月 payments.

常见错误

• Entering a payment that 是 smaller than the 每月 利息. The loan would never be repaid.

常见问题

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