Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Financial
Retirement Savings Calculator
Project the size of your retirement nest egg given your current age, retirement age, monthly contribution, and expected investment return. Use it to test whether your current saving rate is on track for the retirement income you actually want and to see how much more you need to set aside each month to close any gap.
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.
Key differences
| Retirement Savings Calculator | Compound Interest Calculator | |
|---|---|---|
| Category | Financial | Economics |
| Inputs required | 4 | 3 |
| Result | Retirement Savings ($) | Final Amount ($) |
| What it does | Project the size of your retirement nest egg given your current age, retirement age, monthly contribution, and expected investment return. Use it to test whether your current saving rate is on track for the retirement income you actually want and to see how much more you need to set aside each month to close any gap. | 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. |