Set the inputs
Enter initial investment, project receipts and operating costs. Do not count the initial investment again as an operating expense.
Return on investment
Calculate project return from initial investment, receipts and operating costs, separating cash profit and time costs.
Scenario result
Enter your assumptions and calculate the scenario.
Calculations retain decimal precision and display two decimals; rounded rows can differ slightly from totals. This model does not guarantee profit, a probability of success, or lifetime funding.
Simple payback divides investment by constant net cash flow. It is not IRR; ROI is not automatically annualized.
How to use this calculator
Check the terms
To value your time, multiply hours by an hourly value first, then enter that total in unpaid time value. Keep it separate from cash actually paid.
Read the result
Read cash profit, ROI and the result including time cost. Equal receipts do not imply equal value.
A worked example
Illustrative calculation
Investing 10,000 THB with receipts of 15,000 THB and costs of 2,000 THB gives 3,000 THB profit and 30% ROI.
Compare a second scenario
Keep receipts unchanged and increase review hours. Cash profit stays the same while the result after valuing time falls.
Common questions
Where does my information go?
Calculations run in your browser. Financial inputs are neither saved locally nor sent to analytics. Reloading restores the initial values.
What are this model’s limitations?
Project ROI is not an annualized return and does not include taxes or dated cash-flow timing unless explicitly modeled.