Free calculatorMost helpful for Scramblers
Debt vs. Invest Calculator
Compare extra payments on debt with investing the same money.
Debt or invest
Extra money each month
$300
Debt interest rate
18%
Expected investment return
8%
Years
5 years
Paying the debt wins
$10,864
Interest you would avoid: $10,864. Investment growth on the same money: $4,043. Capture any employer match before extra debt payments.
Side by side
Same $300 a month for 5 years, two ways to use it.
- You put in
- $18,000
- Either path
- Pay the debt
- $10,864
- Interest avoided at 18%
- Invest it
- $4,043
- Growth at an assumed 8%
- Debt path ahead by
- $6,821
Where the break-even sits
Your debt costs 18% and you expect 8% from investing. Investing would need to earn more than 18% a year to beat paying the debt, which is 10 points above your assumption.
- Break-even return
- 18%
- Equal to your debt rate
- Your assumed return
- 8%
- Gap
- 10 points
- In favor of the debt
What if returns came in different?
Your debt rate stays put. Returns are assumptions, not promises.
| Return | Investment growth | Winner | Wins by |
|---|---|---|---|
| 4% return | $1,890 | Pay debt | $8,975 |
| 6% return | $2,931 | Pay debt | $7,933 |
| 8% returnYou | $4,043 | Pay debt | $6,821 |
| 10% return | $5,231 | Pay debt | $5,633 |
| 12% return | $6,501 | Pay debt | $4,363 |
| 18% (same as debt) | $10,864 | Tie | $0 |
What if your debt rate were different?
Your assumed 8% return stays put.
| Debt rate | Interest avoided | Winner | Wins by |
|---|---|---|---|
| 8% debt rate | $4,043 | Tie | $0 |
| 13% debt rate | $7,168 | Pay debt | $3,125 |
| 18% debt rateYou | $10,864 | Pay debt | $6,821 |
| 23% debt rate | $15,245 | Pay debt | $11,202 |
Year by year comparison
| Year | Put in | Interest avoided | Investment growth | Ahead |
|---|---|---|---|---|
| Year 1 | $3,600 | $312 | $135 | Debt by $177 |
| Year 2 | $7,200 | $1,390 | $580 | Debt by $810 |
| Year 3 | $10,800 | $3,383 | $1,361 | Debt by $2,022 |
| Year 4 | $14,400 | $6,470 | $2,505 | Debt by $3,965 |
| Year 5 | $18,000 | $10,864 | $4,043 | Debt by $6,821 |
Your next step
Same numbers, different next move
Two people can get this exact result and need totally different first steps. Your Money Type tells you which one is yours.
Strategist“My plan works. I just want it to grow faster.”
Spender“The money is gone before I think about it.”
Saver“I save it. Then it just sits there.”
Scrambler“Every payday I’m guessing what gets paid first.”
How It Works
- 01
Enter the extra money you have each month.
- 02
Add your debt interest rate and an expected investment return.
- 03
Choose the years to see which path comes out ahead.
The 4 Money Types
The Math Is the Same. Your Next Move Isn't.
Spenders, Savers, Scramblers, and Strategists each need a different first fix. The free quiz tells you which type you are, so you know what to do with this number.
Common questions
When the debt rate is higher than the return you can reasonably expect, paying it down is the stronger guaranteed move. High-interest credit cards usually fall in that bucket.
Capture the full 401(k) match before extra debt payments. That match is separate from this comparison.
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