← Blogby Marcell Almeida

How to calculate return on investment (ROI)

Two numbers — what you put in and what you got out — plus profit and ROI percentage.

ROI is the simplest measure of whether an investment paid off. The ROI Calculator computes profit and return percentage from initial cost and final value.

Try it — enter initial cost and final value

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How it works

  1. Initial cost — what you invested or spent.
  2. Final value — current or exit value.

The formula

ROI = (Final − Initial) / Initial × 100. Invest $10,000, exit at $15,000 → $5,000 profit, 50% ROI.

ROI vs campaign ROI

This is a general investment ROI tool. For marketing ad spend specifically, use the Campaign ROI Calculator which also shows ROAS.

The How to calculate return on investment (ROI) is free, runs locally, and never sends your data to a server. More business calculators at maratool.com.