ROI Calculator

About this calculator

A free return-on-investment calculator that turns an amount invested or spent and an amount returned or earned into a clear net gain and ROI percent. Add a holding period in years and it also estimates the annualized (compound-per-year) return so a five-year deal and a one-year deal can be compared on the same footing. ROI is measured on the initial cost only, so it excludes fees, carrying costs, taxes, and reinvested cash flows. Everything runs in your browser; the result is an estimate for comparison, not financial, investment, or tax advice.

What ROI actually measures

Return on investment compares what you got back to what you put in. The net gain is the final value minus the initial cost, and ROI expresses that gain as a percent of the cost — a $10,000 cost that returns $16,000 is a $6,000 gain and a 60% ROI. Because it is a ratio, ROI lets you rank a small deal and a large deal on the same scale instead of comparing raw dollar gains.

ROI is measured on the initial cost only. That keeps the number simple and comparable, but it also means a higher ROI is not automatically the better outcome: a 200% return on a $100 outlay is $200, while a 30% return on $100,000 is $30,000. Read the percent alongside the net-gain figure to keep both the efficiency and the size of the result in view.

Simple ROI versus annualized ROI

A plain ROI percent says nothing about how long the money was tied up, so a five-year deal and a one-year deal can show the same total return while being very different bets. Adding a holding period in years turns the total return into an annualized, compound-per-year rate that puts deals of different lengths on the same footing.

The annualization is compound, not a simple divide-by-years: a 60% total return spread over five years is roughly 9.86% per year, not 12%, because each year's growth builds on the last. Leave the years field at zero to see only the simple, un-annualized ROI when the time horizon does not matter.

What ROI leaves out

This calculator measures ROI on the initial cost alone, so the figure is a clean comparison estimate rather than a full accounting of a deal. It does not subtract transaction fees, ongoing carrying costs, or taxes, and it does not credit partial cash flows — dividends, rent, or interim revenue — that you may have collected along the way.

For a quick side-by-side ranking of opportunities, those omissions are fine and keep the inputs to two numbers. When you are close to a decision, fold the missing costs and cash flows back in by hand, because they can move the real return well away from this headline percent.

By variant

• Investment ROI
• Marketing ROI

Questions

How is ROI calculated?

ROI is the net gain divided by the initial cost, expressed as a percent. The net gain is the final value minus the initial cost, so a $10,000 cost that returns $16,000 is a $6,000 gain and a 60% ROI.

What is annualized ROI?

Annualized ROI spreads the total return evenly across the holding period as a compound per-year rate, so a 60% total return over five years is roughly 9.86% per year. It lets you compare deals with different time horizons fairly. Leave the years field at 0 to see only the simple, un-annualized ROI.

Is the ROI calculator free?

Yes. It is free, needs no account, and calculates entirely in your browser — none of the numbers you enter are uploaded or stored.

Why might my real return differ?

The tool measures ROI on the initial cost alone. It does not subtract fees, carrying costs, or taxes, and it does not account for partial cash flows collected along the way, so treat it as a clean comparison estimate.