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ROI Calculator

Calculate return on investment in seconds — enter your cost and gain, get ROI percentage and net return.

Return on investment

30.0%

Net gain$300.00
Annualized ROI30.0%
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How to calculate ROI

ROI (return on investment) measures the gain from an investment relative to its cost: ROI = (Net Gain ÷ Cost) × 100. Net gain is the final value minus the amount you put in. A $1,000 investment that grows to $1,300 has a $300 net gain and a 30% ROI.

Why annualize ROI

A 30% return over one year is very different from a 30% return over five years. The calculator also shows the annualized rate so you can compare investments on a like-for-like basis — exactly the discipline interviewers and investors expect.

ROI in case interviews

Profitability and investment cases hinge on ROI. Knowing the formula cold lets you quickly judge whether a proposed initiative clears the hurdle rate. Practice applying it under pressure in a full case.

Frequently asked questions

What is the ROI formula?
ROI = (Net Gain ÷ Cost of Investment) × 100. Net gain is the final value minus what you put in. So a $1,000 investment that returns $1,300 has a net gain of $300 and an ROI of 30%.
What is a good ROI?
It depends on the asset class and risk. For business projects, anything that clears your cost of capital (often 8–12%) is creating value. Higher-risk bets are expected to return more. This calculator also shows the annualized rate so you can compare across time horizons.
Is this ROI calculator free?
Yes, fully client-side and free — your numbers never leave your browser.