Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Financial
401(k) Retirement Calculator
Project the balance of your 401(k) at retirement given your current age, retirement age, salary, contribution percentage, employer match, and expected annual return. Use it to test whether your current saving rate is on track and how much your employer match adds over a full career.
Fill in the required fields to see your result.
Economics
Compound Interest Calculator
Project the future value of a lump-sum investment when interest is reinvested each year using A = P · (1 + r)ᵗ. The simplest compounding model — assumes annual compounding, a constant rate, and no additional contributions or withdrawals.
Fill in the required fields to see your result.
Key differences
| 401(k) Retirement Calculator | Compound Interest Calculator | |
|---|---|---|
| Category | Financial | Economics |
| Inputs required | 6 | 3 |
| Result | 401(k) Balance at Retirement ($) | Final Amount ($) |
| What it does | Project the balance of your 401(k) at retirement given your current age, retirement age, salary, contribution percentage, employer match, and expected annual return. Use it to test whether your current saving rate is on track and how much your employer match adds over a full career. | Project the future value of a lump-sum investment when interest is reinvested each year using A = P · (1 + r)ᵗ. The simplest compounding model — assumes annual compounding, a constant rate, and no additional contributions or withdrawals. |