ROI Calculator: Return on Investment From Cost and Return

Return on investment answers the simplest question in business: for every dollar I put in, how much did I get back on top of it. It works for a marketing campaign, a piece of equipment, a new hire or a whole channel. This calculator takes the amount you invested and the amount you got back, then returns the ROI as a percentage and the plain net gain, so you can see both the efficiency and the real money in one view.

How to calculate ROI

Take the amount returned, subtract the cost, then divide that net gain by the cost and multiply by 100. Invest 10,000 and get back 15,000 and the net gain is 5,000, which divided by 10,000 is 0.5, or a 50 percent ROI. If the return is smaller than the cost, the net gain is negative and so is the ROI, which is exactly the signal you want when something has lost money.

The single biggest mistake with ROI is an incomplete cost figure. It is tempting to enter only the obvious spend and forget the tools, the hours and the overhead that made the return possible. Leaving those out inflates the percentage and flatters the project. A trustworthy ROI starts with an honest, fully loaded cost.

ROI versus ROAS and margin

ROI and ROAS often get mixed up. ROAS looks only at revenue against ad spend, so it tells you how efficiently the ads turned into sales but ignores the cost of the product itself. ROI looks at profit against total cost, so it can be positive or negative even when ROAS looks healthy. When you need to know whether something actually made money, ROI is the number to trust.

Reading ROI without being fooled

A percentage on its own hides scale. A 300 percent ROI on a 200 investment returns 600, while a 40 percent ROI on a 500,000 investment returns 200,000. The second is a far bigger win in real terms despite the smaller percentage. Always read ROI next to the net gain, and remember that basic ROI ignores time, so a return earned over five years is not the same as one earned in a month.

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