Calculate return on investment (ROI)

Gain = returned − invested. ROI = gain / invested, shown as a percent. A loss is a negative ROI. Invested = 0 is rejected. There is no compounding frequency and no holding period.

ROI = (valeur récupérée − misé) / misé

This is the textbook one-period ROI, not a time-weighted or money-weighted return, not XIRR, not a Sharpe ratio. Fees belong in the two dollar amounts if you want them in. Multiple deposits over time make “invested” ambiguous; pick a definition and stick to it, or use the contributions page plus honesty about timing.

Amount invested

Denominator. Usually cost basis or cash outlay. Zero is refused.

Amount returned

What you received. Below invested produces a negative ROI.

Assumptions

• One invested amount, one returned amount.
• No time input.

Limits

• Cannot compare a 30% month with a 30% decade.
• Not annualized.
• Not a recommendation to buy or sell.

30% means you got back $1.30 per $1 put in, regardless of calendar time. To annualize two points, use CAGR. Margin on a product sale (profit / price) is a different ratio with a different denominator.

• Calling ROI an annual return.

  This formula has no years. CAGR does.

• Putting profit in “returned” and cost in “invested” when you meant margin on sales.

  Margin uses selling price as the denominator. ROI uses capital invested.

• CAGRCAGR is the fictional constant annual rate that would take a starting value to an ending value in n years. It smooths the trip: a crash and a rebound disappear into one number.
• Profit marginMargin puts profit over selling price; markup puts profit over cost. With $60 cost and $100 price, margin is 40% and markup is 66.7%. You cannot swap the two percents.
• Percent differenceA and B are not labeled “before” and “after.” You get the absolute gap, the gap relative to A, relative to B, and the symmetric gap (divided by the average). That is not a percent increase.
• Inflation and purchasing powerAn amount, a constant annual rate, a period. Compound forward, or bring a later sum back to today’s purchasing power.
• Compound interestGrow a single principal at a nominal annual rate with a chosen compounding frequency, including continuous compounding. The page also reports the effective annual rate. There are no recurring deposits on this form.
• Simple interestInterest is proportional to principal, rate, and time. It does not itself earn interest. Use this only when a contract is actually simple, not as a stand-in for savings compounding.

Written by Rédaction HexaCalc (editorial team). Content last updated: August 25, 2026. No third-party medical or financial review is claimed.

This calculation uses a standard mathematical identity. See also the methodology.