finance calculator

Debt Payoff Calculator

Compare payoff strategies and estimate time to become debt free.

Formula Verified by Dr. Elizabeth Vance, PhD

Quick actions: Save inputs, view saved runs, print, share, or export results

Saved Runs

Inputs

Payoff strategy

Extra monthly payment$

Card 1 balance$

Card 1 APR%

Card 1 minimum$

Card 2 balance$

Card 2 APR%

Card 2 minimum$

Loan balance$

Loan APR%

Loan minimum$

Results

Debt-free timeline

2 years, 4 months

Total debt$16,000

Monthly payment$690

Total interest$3,141

Total paid$19,141

Bookmark this Debt Payoff Planner

Debt payoff is a journey. Save this planner to adjust extra payment amounts, update credit balances, and track your acceleration timeline.

Formula

Debt payoff method

Each month: add interest, pay minimums, then apply extra payment by payoff strategy

Avalanche prioritizes highest interest debt first; snowball prioritizes smallest balance first.

Step by step

How the calculation works

1Enter each debt balance, APR, and minimum payment.
2Choose avalanche or snowball strategy.
3The calculator simulates monthly interest, minimum payments, and extra payments until all debts are paid.

Example

Debt payoff example

With $16,000 in debt and $200 extra per month, the calculator estimates payoff time, interest, and total repayment.

Related guides

Learn more about this calculation

Guide

Debt Snowball vs Avalanche: Compare Payoff Methods

Compare debt snowball and avalanche payoff methods, see how ordering changes interest and timing, and model both with the DTC calculator.

Guide

Loan Payment Guide: Formula, Interest, and Total Cost

Learn how fixed loan payments are calculated, why term length changes total interest, and how the DTC loan calculator matches amortization math.

Guide

Credit Card Payoff: Payment, Interest, and Strategy

Estimate credit card payoff time and interest, compare higher payments and transfers, and understand the limits of the DTC monthly payoff model.

Period	Payment	Principal	Interest	Balance
Month 1	$690	$473	$217	$15,527
Month 2	$690	$480	$210	$15,048
Month 3	$690	$487	$203	$14,561
Month 4	$690	$494	$196	$14,066
Month 5	$690	$502	$188	$13,564
Month 6	$690	$510	$180	$13,055
Month 7	$690	$517	$173	$12,537
Month 8	$690	$525	$165	$12,012
Month 9	$690	$533	$157	$11,479
Month 10	$690	$541	$149	$10,938
Month 11	$690	$550	$140	$10,388
Month 12	$567	$435	$132	$9,953
Month 13	$690	$564	$126	$9,388
Month 14	$690	$572	$118	$8,816
Month 15	$690	$580	$110	$8,236
Month 16	$690	$588	$102	$7,648
Month 17	$690	$597	$93	$7,051
Month 18	$690	$605	$85	$6,446
Month 19	$690	$614	$76	$5,832
Month 20	$690	$622	$68	$5,210
Month 21	$690	$631	$59	$4,579
Month 22	$690	$640	$50	$3,940
Month 23	$690	$649	$41	$3,291
Month 24	$690	$656	$34	$2,635
Month 25	$690	$663	$27	$1,973
Month 26	$690	$669	$21	$1,303
Month 27	$690	$676	$14	$627
Month 28	$633	$627	$7	$0

Period

Payment

Principal

Interest

Balance

Month 1

$690

$473

$217

$15,527

Month 2

$690

$480

$210

$15,048

Month 3

$690

$487

$203

$14,561

Month 4

$690

$494

$196

$14,066

Month 5

$690

$502

$188

$13,564

Month 6

$690

$510

$180

$13,055

Month 7

$690

$517

$173

$12,537

Month 8

$690

$525

$165

$12,012

Month 9

$690

$533

$157

$11,479

Month 10

$690

$541

$149

$10,938

Month 11

$690

$550

$140

$10,388

Month 12

$567

$435

$132

$9,953

Month 13

$690

$564

$126

$9,388

Month 14

$690

$572

$118

$8,816

Month 15

$690

$580

$110

$8,236

Month 16

$690

$588

$102

$7,648

Month 17

$690

$597

$93

$7,051

Month 18

$690

$605

$85

$6,446

Month 19

$690

$614

$76

$5,832

Month 20

$690

$622

$68

$5,210

Month 21

$690

$631

$59

$4,579

Month 22

$690

$640

$50

$3,940

Month 23

$690

$649

$41

$3,291

Month 24

$690

$656

$34

$2,635

Month 25

$690

$663

$27

$1,973

Month 26

$690

$669

$21

$1,303

Month 27

$690

$676

$14

$627

Month 28

$633

$627

How to understand and use this calculator

The Science of Debt Acceleration Strategies

Paying off multiple debts requires a structured plan rather than making random extra payments. The two most effective, structured debt acceleration models are the Debt Avalanche and the Debt Snowball.

Both strategies require you to list all debts, make the minimum payments on all accounts, and dedicate any extra funds (your "debt snowball") to a single target debt. Once that target debt is fully paid off, its minimum payment and the extra funds roll into the next target debt, creating a compounding acceleration effect.

Debt Avalanche: The Mathematical Optimizer

The Debt Avalanche strategy prioritizes paying off debt based on interest rate, targeting the account with the highest APR first, regardless of the balance size.

Math Process: List debts from highest interest rate to lowest. Direct all extra cash to the highest APR debt. Once cleared, target the next highest APR debt.

Pros: Mathematically optimal. It minimizes total interest paid and results in the shortest overall payoff timeline. Ideal for analytical individuals focused on efficiency.

Debt Snowball: The Psychological Motivator

The Debt Snowball strategy prioritizes paying off debt based on balance size, targeting the account with the smallest outstanding balance first, regardless of its interest rate.

Math Process: List debts from smallest balance to largest. Direct all extra cash to the smallest balance. Once cleared, roll its entire payment into the next smallest balance.

Pros: High psychological momentum. Clearing small accounts quickly provides "quick wins" that boost motivation, which behavioral psychology shows is critical for maintaining consistency.

Comparing the Payoff Simulation Math

The simulator calculates month-by-month debt declines using the following logic:

1. For each month $t$, add interest to all active debts: $B_{i,t} = B_{i,t-1} \times (1 + r_i / 12)$.

2. Subtract required minimum payments from each balance: $B_{i,t} = B_{i,t} - M_i$.

3. Identify the target debt based on the strategy (highest APR for Avalanche, smallest balance for Snowball).

4. Apply the extra payment amount to the target debt: $B_{\text{target},t} = B_{\text{target},t} - \text{Extra}$.

5. If the target debt is paid to zero, add its minimum payment to the extra cash pool for the next month. Repeat until all balances reach zero.

Building a Debt Payoff Buffer

Before launching an aggressive debt payoff campaign, build a mini-emergency fund (typically $1,000 or one month of essential expenses). Without this buffer, unexpected medical bills or auto repairs will force you to borrow more, disrupting your repayment momentum.

Related concepts

Debt Avalanche

A debt payoff strategy prioritizing accounts with the highest interest rates first.

Debt Snowball

A debt payoff strategy prioritizing accounts with the smallest balances first.

Credit Utilization

The percentage of available credit card limits currently being utilized, affecting credit scores.

Frequently Asked Questions

Which is better: Debt Avalanche or Debt Snowball?+

Avalanche is mathematically superior because it minimizes interest costs. Snowball is psychologically superior because clearing small balances first builds motivation. The best plan is the one you can stick to.

What is a "debt roll-over"?+

When a debt is fully paid off, its entire monthly payment (minimum + any extra) is added to the minimum payment of the next target debt, accelerating the payoff speed.

Does the calculator assume I stop using my credit cards?+

Yes. The math assumes you make zero new purchases, fees, or cash advances on the accounts during the entire payoff simulation.

Should I pay off debt or save money first?+

Build a small emergency fund ($1,000) first to avoid taking on new debt. Then, target high-interest debt (above 7-8% APR) aggressively before building a larger 3-6 month reserve.

What is a debt consolidation loan?+

It is a personal installment loan used to pay off multiple high-interest credit cards, combining them into a single monthly payment with a fixed term and lower APR.

Will paying off debt improve my credit score?+

Yes. Lowering your outstanding balances directly reduces your credit utilization ratio (which accounts for 30% of your credit score), boosting your credit rating.

What if my minimum payment changes as my balance falls?+

Review and update your inputs every few months. Credit card minimum payments are usually recalculated monthly as a percentage of the outstanding balance.

What is the "debt snowflake" method?+

It involves applying micro-payments (like cash back rewards, selling unused items, or small side income) directly to your target debt immediately, accelerating payoff.

Can I negotiate my credit card interest rates?+

Yes. You can contact your credit card issuer to request a lower APR, especially if you have a history of on-time payments and your credit score has improved.

How do I handle debt collectors?+

Request validation of the debt in writing, verify the statute of limitations, and avoid giving them direct access to your bank account. Consolidate agreements in writing.

Period	Payment	Principal	Interest	Balance
Month 1	$690	$473	$217	$15,527
Month 2	$690	$480	$210	$15,048
Month 3	$690	$487	$203	$14,561
Month 4	$690	$494	$196	$14,066
Month 5	$690	$502	$188	$13,564
Month 6	$690	$510	$180	$13,055
Month 7	$690	$517	$173	$12,537
Month 8	$690	$525	$165	$12,012
Month 9	$690	$533	$157	$11,479
Month 10	$690	$541	$149	$10,938
Month 11	$690	$550	$140	$10,388
Month 12	$567	$435	$132	$9,953
Month 13	$690	$564	$126	$9,388
Month 14	$690	$572	$118	$8,816
Month 15	$690	$580	$110	$8,236
Month 16	$690	$588	$102	$7,648
Month 17	$690	$597	$93	$7,051
Month 18	$690	$605	$85	$6,446
Month 19	$690	$614	$76	$5,832
Month 20	$690	$622	$68	$5,210
Month 21	$690	$631	$59	$4,579
Month 22	$690	$640	$50	$3,940
Month 23	$690	$649	$41	$3,291
Month 24	$690	$656	$34	$2,635
Month 25	$690	$663	$27	$1,973
Month 26	$690	$669	$21	$1,303
Month 27	$690	$676	$14	$627
Month 28	$633	$627	$7	$0

Period

Payment

Principal

Interest

Balance

Month 1

$690

$473

$217

$15,527

Month 2

$690

$480

$210

$15,048

Month 3

$690

$487

$203

$14,561

Month 4

$690

$494

$196

$14,066

Month 5

$690

$502

$188

$13,564

Month 6

$690

$510

$180

$13,055

Month 7

$690

$517

$173

$12,537

Month 8

$690

$525

$165

$12,012

Month 9

$690

$533

$157

$11,479

Month 10

$690

$541

$149

$10,938

Month 11

$690

$550

$140

$10,388

Month 12

$567

$435

$132

$9,953

Month 13

$690

$564

$126

$9,388

Month 14

$690

$572

$118

$8,816

Month 15

$690

$580

$110

$8,236

Month 16

$690

$588

$102

$7,648

Month 17

$690

$597

$93

$7,051

Month 18

$690

$605

$85

$6,446

Month 19

$690

$614

$76

$5,832

Month 20

$690

$622

$68

$5,210

Month 21

$690

$631

$59

$4,579

Month 22

$690

$640

$50

$3,940

Month 23

$690

$649

$41

$3,291

Month 24

$690

$656

$34

$2,635

Month 25

$690

$663

$27

$1,973

Month 26

$690

$669

$21

$1,303

Month 27

$690

$676

$14

$627

Month 28

$633

$627

How to understand and use this calculator

The Science of Debt Acceleration Strategies

Debt Avalanche: The Mathematical Optimizer

The Debt Avalanche strategy prioritizes paying off debt based on interest rate, targeting the account with the highest APR first, regardless of the balance size.

Math Process: List debts from highest interest rate to lowest. Direct all extra cash to the highest APR debt. Once cleared, target the next highest APR debt.

Pros: Mathematically optimal. It minimizes total interest paid and results in the shortest overall payoff timeline. Ideal for analytical individuals focused on efficiency.

Debt Snowball: The Psychological Motivator

The Debt Snowball strategy prioritizes paying off debt based on balance size, targeting the account with the smallest outstanding balance first, regardless of its interest rate.

Math Process: List debts from smallest balance to largest. Direct all extra cash to the smallest balance. Once cleared, roll its entire payment into the next smallest balance.

Pros: High psychological momentum. Clearing small accounts quickly provides "quick wins" that boost motivation, which behavioral psychology shows is critical for maintaining consistency.

Comparing the Payoff Simulation Math

The simulator calculates month-by-month debt declines using the following logic:

1. For each month $t$, add interest to all active debts: $B_{i,t} = B_{i,t-1} \times (1 + r_i / 12)$.

2. Subtract required minimum payments from each balance: $B_{i,t} = B_{i,t} - M_i$.

3. Identify the target debt based on the strategy (highest APR for Avalanche, smallest balance for Snowball).

4. Apply the extra payment amount to the target debt: $B_{\text{target},t} = B_{\text{target},t} - \text{Extra}$.

5. If the target debt is paid to zero, add its minimum payment to the extra cash pool for the next month. Repeat until all balances reach zero.

Building a Debt Payoff Buffer

Related concepts

Debt Avalanche

A debt payoff strategy prioritizing accounts with the highest interest rates first.

Debt Snowball

A debt payoff strategy prioritizing accounts with the smallest balances first.

Credit Utilization

The percentage of available credit card limits currently being utilized, affecting credit scores.

Frequently Asked Questions

Which is better: Debt Avalanche or Debt Snowball?+

What is a "debt roll-over"?+

When a debt is fully paid off, its entire monthly payment (minimum + any extra) is added to the minimum payment of the next target debt, accelerating the payoff speed.

Does the calculator assume I stop using my credit cards?+

Yes. The math assumes you make zero new purchases, fees, or cash advances on the accounts during the entire payoff simulation.

Should I pay off debt or save money first?+

Build a small emergency fund ($1,000) first to avoid taking on new debt. Then, target high-interest debt (above 7-8% APR) aggressively before building a larger 3-6 month reserve.

What is a debt consolidation loan?+

It is a personal installment loan used to pay off multiple high-interest credit cards, combining them into a single monthly payment with a fixed term and lower APR.

Will paying off debt improve my credit score?+

Yes. Lowering your outstanding balances directly reduces your credit utilization ratio (which accounts for 30% of your credit score), boosting your credit rating.

What if my minimum payment changes as my balance falls?+

Review and update your inputs every few months. Credit card minimum payments are usually recalculated monthly as a percentage of the outstanding balance.

What is the "debt snowflake" method?+

It involves applying micro-payments (like cash back rewards, selling unused items, or small side income) directly to your target debt immediately, accelerating payoff.

Can I negotiate my credit card interest rates?+

Yes. You can contact your credit card issuer to request a lower APR, especially if you have a history of on-time payments and your credit score has improved.

How do I handle debt collectors?+

Request validation of the debt in writing, verify the statute of limitations, and avoid giving them direct access to your bank account. Consolidate agreements in writing.

Debt Payoff Calculator

Inputs

Results

Bookmark this Debt Payoff Planner

Debt payoff method

How the calculation works

Debt payoff example

Learn more about this calculation

Debt Snowball vs Avalanche: Compare Payoff Methods

Loan Payment Guide: Formula, Interest, and Total Cost

Credit Card Payoff: Payment, Interest, and Strategy

Debt Payoff Calculator

Inputs

Results

Bookmark this Debt Payoff Planner

Key output metrics

Starting debt by account

Debt balance timeline

Principal, interest, and balance timeline

How to understand and use this calculator

The Science of Debt Acceleration Strategies

Debt Avalanche: The Mathematical Optimizer

Debt Snowball: The Psychological Motivator

Comparing the Payoff Simulation Math

Building a Debt Payoff Buffer

Related concepts

Frequently Asked Questions

Debt payoff method

How the calculation works

Debt payoff example

Learn more about this calculation

Debt Snowball vs Avalanche: Compare Payoff Methods

Loan Payment Guide: Formula, Interest, and Total Cost

Credit Card Payoff: Payment, Interest, and Strategy

Key output metrics

Starting debt by account

Debt balance timeline

Principal, interest, and balance timeline

How to understand and use this calculator

The Science of Debt Acceleration Strategies

Debt Avalanche: The Mathematical Optimizer

Debt Snowball: The Psychological Motivator

Comparing the Payoff Simulation Math

Building a Debt Payoff Buffer

Related concepts

Frequently Asked Questions