Multiple Debt Payoff Calculator with Full Amortisation Schedule for Every Debt
Build a complete month-by-month payoff plan for all your debts. See payment allocation, per-debt amortisation schedules, running totals, and exactly how each debt gets cleared using your chosen strategy.
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Multiple Debt Payoff Calculator
Your Debts
Debt nameBalanceAnnual Rate %Min. Payment
$
Extra amount applied to priority debt each month on top of all minimums. Rolls when a debt is cleared.
📅
Shows calendar dates in schedules and payoff summaries.
mo.
How many months to show in the detailed schedules.
Payoff Strategy
Debt-Free Date
—
months to go
Total Debt
—
combined opening balance
Total Interest Cost
—
selected strategy
Total Amount Paid
—
principal + interest
Monthly Outgoing
—
minimums + extra
Interest Saved vs Minimum
—
by using this strategy + extra
Per-Debt Payoff Summary
Monthly Payment Allocation (first 12 months)
Full Plan Summary
Number of debts—
Total combined balance—
Total minimum payments—
Extra monthly payment—
Total monthly outgoing—
Total interest paid—
Total amount paid (P + I)—
Interest saved vs minimum only—
Months saved vs minimum only—
Debt-free date—
Per-Debt Amortisation Schedules
Combined Balance Over Time
✦ Cal, AI Explanation
Cal is reviewing your payoff plan...
💬 Ask Cal about your debt payoff plan
Cal
Your payoff plan is ready. Ask me about payment allocation, whether to change strategy, how refinancing one debt affects the plan, or what happens if you add more extra payment.
📋 How this differs from the Debt-Free Date Calculator
This shows the full month-by-month schedule for every debt, not just the payoff date
Payment allocation shows exactly how each month's money is split across all debts
Per-debt amortisation tabs let you see the complete schedule for each individual debt
Running totals track cumulative interest and principal paid at every point in the plan
Use this when you want to print or export a detailed payoff plan, not just a summary
The calculator runs a full month-by-month simulation across all debts simultaneously. Each month it applies interest to every outstanding balance, pays the minimum on each debt, and directs any extra payment to the priority debt according to the chosen strategy. When a debt is cleared, its freed minimum payment rolls forward to the next priority debt automatically.
The amortisation formula behind each schedule
Interest this month = Balance × (Annual rate / 12)
Principal this month = Payment − Interest this month
New balance = Previous balance − Principal this month
Each debt runs its own schedule. The priority debt receives all extra payment beyond minimums. When that debt clears, its minimum joins the extra pool for the next target.
Payment allocation
In the first few months, most minimums go to interest rather than principal. As balances fall and the extra payment stack rolls, more money reduces principal each month. The allocation table shows exactly how each month's total payment is divided across all debts, making it easy to see the plan working in real time.
Month
Total Paid
Goes to Interest
Goes to Principal
Combined Balance
1
Based on your inputs
Highest early on
Grows over time
Falls slowly at first
Mid-plan
Same or higher (rolls)
Falling
Growing
Falling faster
Final months
Concentrated on last debt
Near zero
Almost all principal
Near zero
Frequently Asked Questions
How is this different from the Debt-Free Date Calculator?+
The Debt-Free Date Calculator tells you when you will be debt-free under each strategy and compares the three strategies side by side. This calculator goes further by producing the full month-by-month schedule for every debt, showing exactly how each payment is allocated across all your debts, and giving you a per-debt amortisation tab you can review or print. Use the Debt-Free Date Calculator to compare strategies quickly, and this calculator when you want to understand or share the full detailed plan.
How does the extra payment roll work in this plan?+
The extra monthly payment is directed to the priority debt each month according to the chosen strategy. When that debt is paid off, its freed minimum payment is added to the extra pool for the next month. This means the total amount attacking the next priority debt is larger than the original extra payment alone. The rollover happens automatically in the simulation and you can see it clearly in the payment allocation table, where the amount going to the priority debt increases as each earlier debt clears.
What does the payment allocation table show?+
The allocation table shows each month as a row and each debt as a column. Each cell shows how much of the total payment went to that debt in that month, split between interest and principal. The total column shows the combined monthly outgoing. This makes it easy to see which debts are receiving extra attention, when they become zero, and when the freed payment starts rolling to the next debt. It is the most detailed view of the plan in action.
Can I print this payoff plan?+
Yes. Use your browser's print function (Ctrl+P or Cmd+P). The page includes print styles that hide the navigation, input form, and sidebar, showing only the results and schedules in a clean format. For the most complete printout, set the schedule rows to Full Schedule before calculating so all months appear in the per-debt amortisation tabs.
What if one of my debts has a variable interest rate?+
The calculator assumes each rate is fixed for the full payoff period. For variable-rate debts such as credit cards or tracker mortgages, enter your current rate as an estimate. If you expect rates to rise, use a slightly higher rate to produce a conservative plan. The result will be approximate rather than exact, but the payment structure and allocation logic will still be correct and useful for planning purposes.
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