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Partner Debt Payoff Strategy Calculator

Compare avalanche vs snowball strategies for paying off two partner debts together. See how extra payments reduce your timeline and total interest paid.

Inputs

%
%

Results

Payoff Time (with Extra)

36 months

Interest Saved

$7,414.40

≈ 7 smartphones

Total Combined Debt$23,000.00
Total Interest (with Extra)$5,021.79
Payoff Time (Minimums Only)76 months
Total Interest (Minimums Only)$12,436.19
Months Saved40 months
Total Amount Paid$28,021.79
How to Use This Calculator
  1. Enter each debt outstanding balance, interest rate, and minimum payment.
  2. Set the total additional monthly payment available beyond minimums.
  3. Select payoff strategy: avalanche (highest rate first) or snowball (lowest balance first).
  4. Review the debt-free date and total interest paid under each strategy.
  5. Choose the strategy that best fits your motivation style and financial goals.

How the result changes with Debt 1 Balance ($)

Debt 1 Balance ($)Payoff Time (with Extra)Interest Saved
1,000,000600 months-$19,536,870.07
3,500,000600 months-$72,824,711.67
6,500,000600 months-$136,770,121.60
9,000,000600 months-$190,057,963.20

What each input means

Debt 1 Balance ($)
Current balance of the first debt (e.g., Partner A's student loan).
Debt 1 Interest Rate (%)
Annual interest rate on debt 1.
Debt 1 Min Payment ($)
Minimum monthly payment required on debt 1.
Debt 2 Balance ($)
Current balance of the second debt (e.g., Partner B's credit card).
Debt 2 Interest Rate (%)
Annual interest rate on debt 2.
Debt 2 Min Payment ($)
Minimum monthly payment required on debt 2.
Extra Monthly Payment ($)
Additional amount the couple can put toward debt each month beyond minimums.
Payoff Strategy
Avalanche saves more interest; Snowball provides quicker psychological wins.

What each result means

Total Combined Debt
Sum of both debt balances.
Payoff Time (with Extra)
Months to become debt-free using your chosen strategy with extra payments.
Total Interest (with Extra)
Total interest paid using your strategy with extra payments.
Payoff Time (Minimums Only)
Months to payoff paying only minimum amounts.
Total Interest (Minimums Only)
Total interest paid if only making minimum payments.
Interest Saved
How much interest you save by making extra payments.
Months Saved
How many months sooner you'll be debt-free.
Total Amount Paid
Total principal + interest paid over the life of both debts.

How this is calculated

Worked example, using the default values

  1. Identify Input Parameters
    4 parameters
    Debt 1 Balance ($) = 8000, Debt 1 Interest Rate (%) = 6.5, Debt 1 Min Payment ($) = 200, Debt 2 Balance ($) = 15000 = 8 input(s) provided
  2. Calculate Payoff Time
    Payoff Time = min(strategyMonths
    36 = 36
  3. Calculate Interest Saved
    Interest Saved = minOnlyTotalInterest - strategyInterest
    7414.4 = $7,414.4
  4. Calculate Total Combined Debt
    Total Combined Debt = debt1Balance + debt2Balance
    23000 = $23,000
  5. Calculate Total Interest
    Total Interest
    5021.79 = $5,021.79

Engine last updated .

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