The ROI calculator
What a sum of money returned, as a percentage, and what that is worth a year once the length of the investment is taken into account.
The numbers
Everything is worked out in your browser. No figure is sent anywhere.
How to use the ROI calculator
- Type what you put in, what you got back and how long it took.
- Type your own numbers. The result updates as you type.
- Copy the result, or change an assumption and watch what it does.
Frequently asked questions
How do you annualise a return?
By compounding: the ratio of what came back to what went in, raised to the power of one over the number of years, minus one. That turns a 60 percent return over three years into about 17 percent a year, which is the only fair way to compare it with anything else.
How exact is it?
The arithmetic is exact and rounded the way money is, at the cent. What it cannot know is anything specific to you, so read it as the ordinary case rather than as advice.
Is anything uploaded?
Every figure is worked out in your browser. Nothing is uploaded, there is no sign-up, and no result is stored anywhere but on your own device.
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