Compare calculators

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

ROI Calculator

Calculate the percentage return on an investment as (Final Value − Initial Investment) / Initial Investment × 100. The most widely used single-number measure for comparing investments, projects, or campaigns of different sizes on a common percentage basis.

Initial Investment ($)

Final Value ($)

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.

Principal Amount ($)

Annual Interest Rate (%)

Time Period (years)

Fill in the required fields to see your result.

Key differences

	ROI Calculator	Compound Interest Calculator
Category	Economics	Economics
Inputs required	2	3
Result	Return on Investment (%)	Final Amount ($)
What it does	Calculate the percentage return on an investment as (Final Value − Initial Investment) / Initial Investment × 100. The most widely used single-number measure for comparing investments, projects, or campaigns of different sizes on a common percentage basis.	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.