Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
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.
Accounting
Return on Investment (ROI) Calculator
Compute the annualized return on an investment from its initial cost, final value, and the time it was held — putting investments of different durations on a common, comparable scale. Use it to evaluate whether a stock, real estate deal, or business investment outperformed alternatives like an index fund.
Key differences
| Compound Interest Calculator | Return on Investment (ROI) Calculator | |
|---|---|---|
| Category | Economics | Accounting |
| Inputs required | 3 | 4 |
| Result | Final Amount ($) | Annualized ROI (%) |
| What it does | 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. | Compute the annualized return on an investment from its initial cost, final value, and the time it was held — putting investments of different durations on a common, comparable scale. Use it to evaluate whether a stock, real estate deal, or business investment outperformed alternatives like an index fund. |