Compare calculators
Both calculators run independently — change the inputs on either side to compare results.
Financial
APR Calculator
Compute the effective annual percentage rate on a fixed-payment loan, including origination fees. Uses the constant-payment N-ratio approximation so fees are amortized across the term.
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
| APR Calculator | Compound Interest Calculator | |
|---|---|---|
| Category | Financial | Economics |
| Inputs required | 4 | 3 |
| Result | Approximate APR (%) | Final Amount ($) |
| What it does | Compute the effective annual percentage rate on a fixed-payment loan, including origination fees. Uses the constant-payment N-ratio approximation so fees are amortized across the term. | 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. |