信用卡还款计算器
计算还清信用卡债务所需的时间和总利息。
最低还款：max(余额的2%, $25)
目标还款期
关于此工具
信用卡还债计算器帮助您理解持有余额的真实经济成本，并制定切实可行的无债计划。输入当前余额、利率和计划的月度还款金额，该工具会精确计算偿还债务需要的月数，并显示您在这个过程中需要支付的总利息。由于信用卡利息每日复利计算，没有适当规划很容易低估还款所需的时间。
要使用计算器，只需输入信用卡余额、年利率（APR）和计划的月度还款额。该工具会立即生成还款时间表，显示您每月的余额减少情况和累积利息费用。这可以帮助您决定是否增加月度还款额来节省利息，或者评估当前还款策略是否符合您的预算。许多人发现，仅通过每月增加20至50美元的还款，就可以节省数千美元。
该工具对持有多张信用卡余额的人特别有用，您可以分别计算每张卡并优先确定应该先偿还哪些卡。了解您的还款时间表也会激励您加快还款速度，帮助您在迈向零余额的过程中避免累积新的债务。请记住，该计算假设利率固定且月度还款保持一致；如果您的发卡机构更改利率或您遗漏还款，实际时间表可能会有所不同。
常见问题
代码实现
def payoff_simulation(balance, annual_rate, monthly_payment):
"""
Simulate credit card payoff month by month.
Parameters:
balance - current balance owed
annual_rate - annual interest rate (e.g. 0.20 for 20%)
monthly_payment - fixed payment made each month
Returns dict with months, total_paid, and total_interest.
"""
monthly_rate = annual_rate / 12
months = 0
total_paid = 0.0
total_interest = 0.0
while balance > 0:
interest = balance * monthly_rate
total_interest += interest
balance += interest
payment = min(monthly_payment, balance)
balance -= payment
total_paid += payment
months += 1
if months > 1200: # safety cap (100 years)
break
return {
"months": months,
"total_paid": total_paid,
"total_interest": total_interest,
}
def required_payment(balance, annual_rate, months):
"""
Calculate fixed monthly payment to clear a balance in exactly N months.
Standard amortization formula: M = P * r / (1 - (1+r)^-n)
"""
r = annual_rate / 12
if r == 0:
return balance / months
return balance * r / (1 - (1 + r) ** -months)
def min_payment(balance, min_percent=0.02, min_floor=25.0):
"""Return the minimum payment (2% of balance, at least $25)."""
return max(balance * min_percent, min_floor)
# Example: $5,000 balance at 20% APR, paying $150/month
result = payoff_simulation(5000, 0.20, 150)
print(f"Months to pay off: {result['months']}")
print(f"Total paid: ${result['total_paid']:,.2f}")
print(f"Total interest: ${result['total_interest']:,.2f}")
# Required payment to pay off in 24 months
payment = required_payment(5000, 0.20, 24)
print(f"\nRequired for 24 months: ${payment:,.2f}/mo")
# Minimum payment scenario
mp = min_payment(5000)
mp_result = payoff_simulation(5000, 0.20, mp)
print(f"Minimum payment (${mp:.2f}/mo) takes {mp_result['months']} months")
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