Compare calculators

Both calculators run independently — change the inputs on either side to compare results.

ROI Calculator

Calculate the simple return on investment (ROI) percentage from an initial outlay and a final value. Use it for quick performance comparisons across investments where time horizon is the same or you do not need an annualized view.

Initial Investment ($)

Final Value ($)

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.

Principal Amount ($)

Annual Interest Rate (%)

Time Period (years)

Key differences

	ROI Calculator	Compound Interest Calculator
Category	Investing	Economics
Inputs required	2	3
Result	Return on Investment (%)	Final Amount ($)
What it does	Calculate the simple return on investment (ROI) percentage from an initial outlay and a final value. Use it for quick performance comparisons across investments where time horizon is the same or you do not need an annualized view.	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.