About this roi calculator
Compare total proceeds with the total cost of an investment or project. Net gain is proceeds minus cost. ROI is net gain divided by cost and multiplied by 100. Use this workspace to prepare a result you can review before putting it to use. All processing takes place on your device, without an account or an upload of your inputs. Check the examples to understand the expected output, read the limitations for the supported scope, and reset the form when you want to start a separate task.
How it works
Net gain is proceeds minus cost. ROI is net gain divided by cost and multiplied by 100.
Try these examples
Cost 1000; proceeds 1200
Net gain 200; ROI 20%
Cost 200; proceeds 150
Net gain -50; ROI -25%
Limitations & privacy
Cost must be 0.01–1 trillion; proceeds 0–1 trillion. Include relevant fees in your inputs. This is not annualized, does not account for cash-flow timing or risk, and is not investment advice.
Inputs and results stay in this browser. Only tool identifiers are stored for your recently used tools. You can clear that history from the directory.
A few good questions
How is the result produced?
Net gain is proceeds minus cost. ROI is net gain divided by cost and multiplied by 100.
Are my inputs sent to a server?
No. Inputs and results are processed locally and are not uploaded or included in telemetry. Copying or downloading is your choice.
What are the limits of this tool?
Cost must be 0.01–1 trillion; proceeds 0–1 trillion. Include relevant fees in your inputs. This is not annualized, does not account for cash-flow timing or risk, and is not investment advice.
Updated September 19, 2026