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ROI Calculator

Calculate return on investment as a percentage of your initial outlay. Enter net profit and investment cost to measure efficiency of any business decision.

Last reviewed 15 August 2026

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When to use this calculator

  • Before choosing between saving, investing or changing a contribution.
  • When you want to compare cautious, base and optimistic return assumptions.
  • When you need a projection before making a longer-term decision.
  • When you want to see whether starting earlier or contributing more changes the outcome more.

A realistic Ireland planning example

Use these sample inputs as a quick scenario test, then change one variable at a time to compare outcomes.

A realistic Ireland planning example
InputValue
Profit (€)20000
Total Investment (€)€15,000

After entering these figures, focus on return on investment first and then rerun the tool with a more cautious assumption.

How to read your results

Return on Investment

A projected outcome under the growth rate you entered. Real-world returns fluctuate, so also check a more conservative assumption.

Common mistakes

  • !Using an assumption that is not supported by a current local quote, bill, statement or official source.
  • !Treating a generic estimate as a lender, provider, payroll or tax authority decision.
  • !Mixing monthly and annual inputs without converting them consistently.
  • !Testing only one scenario instead of checking how a cautious assumption changes the result.

What to do next

  • Run a second scenario with a cautious assumption so you can see the downside clearly.
  • Compare the result with the related calculators below before making a decision.
  • Check current local rules, eligibility and provider terms before applying or committing money.
  • Keep a record of the assumptions so you can update the estimate when a quote, bill or pay figure changes.

Frequently asked

The investment calculator multiplies your initial investment by the annual return rate, compounded over the number of years specified. It assumes regular contributions (if specified) are added at intervals and also earn returns.

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