ROI Calculator

Understanding return on investment for business decisions

Return on investment (ROI) is the most widely used metric for evaluating business expenditures, capital investments, and project proposals. At its simplest, ROI measures how much profit or loss an investment generates relative to its cost, expressed as a percentage. A positive ROI means the investment returned more than it cost; a negative ROI means it lost money.

The limitation of simple ROI is that it ignores time. A 50% return over one year is very different from a 50% return over ten years. Annualized ROI solves this by expressing the return as a compound annual growth rate (CAGR), making it possible to compare investments with different timeframes on an equal basis.

How to use this ROI calculator

1. Enter the initial investment amount (the total cost outlay at the start).
2. Enter the final value or total return received from the investment.
3. Specify the investment period in years to calculate annualised ROI.
4. To compare investments, add up to three options side by side and review the annualised ROI and payback period for each.

What is a good ROI benchmark for Australian businesses?

Annualised ROI provides the fairest comparison across investment types. Australian businesses typically target different thresholds: capital equipment in mining and construction often requires 20-30% annualised ROI to justify the risk, software and SaaS investments are expected to pay back within 12-18 months, and marketing spend is benchmarked against a 5:1 return ratio. ROI alone should not drive the decision - consider cash flow timing, risk, strategic value, and opportunity cost alongside the numbers.

What is the ROI of automating accounts payable?

Most businesses that automate AP see ROI within 3-6 months through reduced processing time, eliminated data entry errors, captured early payment discounts, and freed-up finance staff time. The typical cost to process an invoice manually in Australia is $15-$30; automation brings that below $5. For an industrial business processing 500 invoices per month, that is a saving of $5,000-$12,500 monthly - delivering a clear, measurable return that compounds as invoice volumes grow. You can estimate your own per-invoice costs with our invoice processing cost calculator, or use the AP-specific ROI calculator for a more detailed breakdown.

Worked example: AP automation ROI

A mid-size construction business spends $15,000 on AP automation software (annual licence, onboarding, and training). Over the next 12 months, the business saves $45,000 through reduced manual processing, fewer data entry errors, and captured early payment discounts.

The ROI calculation:

ROI = ($45,000 - $15,000) / $15,000 x 100 = 200%

With monthly savings of approximately $3,750, the payback period is just 4 months. After that point, every dollar saved flows directly to the bottom line. This is a common pattern for AP automation in Australian businesses, where manual processes still dominate many finance teams.

Common ROI benchmarks for invoice processing

The industry average cost to process a single invoice manually is $12-$15 in Australia. This includes staff time for data entry, approvals routing, filing, and error correction. With automation, the cost per invoice drops to $3-$5 - a reduction of 60-75%.

For a business processing 500 invoices per month, the numbers add up quickly. At $12-$15 per invoice manually versus $3-$5 automated, that is $4,500-$5,000 per month in savings - or $54,000-$60,000 annually. Even accounting for the cost of the software, most businesses achieve a positive ROI within the first quarter.

The Australian Government's MoneySmart resource recommends that businesses evaluate any investment by comparing total costs against expected returns over a defined period - which is exactly what an ROI calculation provides.

What is a good ROI for a business investment?

Any ROI above 0% means the investment earned more than it cost. For technology investments, a 100-300% ROI within 12 months is considered strong. For AP automation specifically, most businesses see payback within 3-6 months, which translates to annualised returns well above 200%. The key is to measure ROI consistently - use the same timeframe and include all costs (licence fees, implementation, training, and ongoing support) to get an accurate picture.

How do you calculate payback period?

Divide the initial investment by the monthly savings. If you spend $10,000 and save $3,000 per month, payback is 3.3 months. The payback period tells you how quickly you recover your investment, while ROI tells you the total return over the measurement period. Both metrics matter: a short payback period reduces risk, and a high ROI confirms the investment is worth holding onto long-term.

This calculator provides general estimates for informational purposes only. It does not constitute financial, tax, or professional advice. Actual ROI and payback periods will vary depending on your business circumstances, invoice volumes, and software costs. Consult a qualified financial adviser before making investment decisions.