DocomintROI Calculator
Calculate return on investment (ROI) percentage from an investment's cost and current value.
ROI condenses any investment's performance into one comparable percentage — the gain or loss relative to what was put in — useful for comparing wildly different investments (stocks, a side business, home renovations) on the same scale, though it deliberately ignores the time it took to get there, which is what annualized return metrics are for.
Example: A $5,000 investment now worth $6,250 has an ROI of 25% ($1,250 gain ÷ $5,000 cost) — the same 25% ROI could come from doubling your money in a month or over a decade, which is why ROI alone doesn't tell the whole story without a timeframe attached.
How it works
- Enter the investment's cost and its current (or exit) value
- Press Calculate
- The gain/loss and ROI percentage appear instantly, calculated on your device
Frequently asked questions
What counts as a good ROI?
It depends heavily on the investment type and timeframe — a 25% ROI over one month is exceptional, but the same 25% over 10 years is mediocre. There's no universal "good" number without also knowing how long it took to achieve.
Does ROI account for how long the investment took?
No — plain ROI is time-agnostic by design, which makes it easy to compare across investment types but means two investments with identical ROI can have very different actual performance once you factor in how many years each took.
Is my numbers uploaded anywhere?
No — ROI Calculator runs entirely in your browser using JavaScript/WebAssembly. Your numbers is never sent to a server.