Return on Investment (ROI) Calculator

Updated 2 August 2026

ROI Calculator

Work out your Return on Investment, plus the annualised return when you enter how long the investment was held.

Amount invested $ Amount returned $ Total amount you received back when the investment was sold or matured. Time held (optional) years Enter to also see the annualised ROI per year.

Total ROI 35.00% Gain of $3,500

Annualised return 10.52% per year

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Solid return An annualised return of 10.52% over 3 years is comfortably above the long-term sharemarket average. Worth comparing against benchmarks like the NZX 50 or your KiwiSaver fund's returns. Project future investment growth here.

Our ROI calculator evaluates the performance of a business decision by dividing your business spend ('invested amount') by the money generated ('returned amount'). The net gain/loss and percentage is calculated. A positive ROI means the money generated exceeded the investment.

Take some examples:

Bob spends $1,000 on a Facebook campaign for his lawn mowing service. He receives $5,000 of new work from the campaign. His ROI is 400%, indicating for every $1 he spends, he makes $4.
Jane spends $1,000 on a newspaper advert to promote her plant watering business. She receives $500 of new work. Her ROI is -50%, indicating for ever $1 she spends, she makes 50 cents.

Return on investment isn't necessarily the same as 'company profit' or 'return on owner's equity'

ROI deals with the money you invest and the actual return generated from specific investments.
Profit instead measures the performance of the business.
Return on Owner's Equity is different as well, as this looks at the capital invested in the business.

How can I use ROI?

ROI can be used to measure different aspects of a business. For example, marketing campaigns, performance of pricing policies, inventory investment, capital equipment investment, and so forth.