Finance

ROI Calculator

Measure gain or loss relative to what you invested. Enter the initial outlay and the final (or current) value to get ROI as a percentage plus absolute profit.

Calculate

Updates as you type

Result

—

The formula

ROI divides net gain (or loss) by the original investment, then multiplies by 100 for a percentage. Profit is final value minus initial investment.

ROI = ((Final − Initial) ÷ Initial) × 100 · Profit = Final − Initial

Worked example

  1. Initial $10,000; final value $12,500
  2. Profit = $12,500 − $10,000 = $2,500
  3. ROI = ($2,500 ÷ $10,000) × 100 = 25%

Result: ROI 25% · profit $2,500

How ROI is calculated

Simple ROI answers “how much did I gain relative to what I put in?” It is scale-free, which makes different project sizes comparable — but it ignores time and risk unless you add them yourself.

Numerator and denominator

Initial must be positive. Final can be higher (gain) or lower (loss). A negative ROI means the ending value is below the start. We do not annualize: 25% in one month and 25% in five years look identical here.

What to include in “initial” and “final”

Be consistent. If initial includes fees and taxes paid to enter, final should reflect what you could realize after exit costs — or state that you are measuring paper mark-to-market only. Marketing “ROI” that counts revenue without subtracting cost of goods will not match finance ROI.

Time and risk (not in the formula)

For multi-year comparisons, convert to an annualized return (for example with compound interest) or state the holding period next to the ROI. Two projects with the same ROI can have very different volatility and liquidity.

What we do not model

No cash-flow timing, dividends reinvested mid-period, leverage, or risk-adjusted metrics (Sharpe, etc.). Use specialized tools when those matter.

Interesting facts

Used everywhere

ROI is the standard ratio for comparing investments of different sizes: gain (or loss) relative to what you put in.

Time frame missing

A 50% ROI in one month is not the same as 50% in five years. Annualize or state the period when you compare deals.

Cash vs accounting ROI

Marketing teams sometimes count revenue lift; finance may count free cash flow. Define the numerator before celebrating.

Sunk costs still matter ethically

For forward decisions, ignore irrecoverable sunk costs — but report historical ROI honestly including what was spent.

Risk is invisible in the %

Two projects can share an expected ROI while one is far more volatile. Pair ROI with risk, liquidity, and downside scenarios.

Frequently asked questions

It depends on asset class, risk, and holding period. Compare to a relevant benchmark (for example a broad stock index for equity risk) and state the time window.

Profit is the absolute gain (final − initial). ROI scales that gain by the initial investment so a $500 profit on $1,000 (50%) beats $500 on $10,000 (5%).

Yes. If final value is below initial cost, profit and ROI are negative — a loss relative to what you invested.

No. For growth over multiple years with compounding, use the compound interest calculator or compute an annualized rate separately.

For a realistic investor ROI, include purchase fees in initial cost and subtract selling costs from final proceeds. Mark-to-market ROI before costs is fine if you label it clearly.

References

  1. Investor.gov — Getting started — U.S. Securities and Exchange Commission (SEC) Plain-language investing basics from the U.S. securities regulator.
  2. Money management basics — Consumer Financial Protection Bureau (CFPB) Consumer tools for comparing financial products and costs.
  3. Compound interest (related metric) — U.S. Securities and Exchange Commission — Investor.gov When time matters, compound growth is a better companion metric than raw ROI.