ROI Calculator — ROI %, Annualized ROI (CAGR) & Payback

Real-world use cases

• Score a paid ad campaign before scaling budget

  You spent $5,000 on a two-week ad burst and it drove $8,000 in tracked revenue. Type 5000 into cost, 8000 into final value, and read ROI = +60% with a $3,000 net gain. Now open the extra-cost field and add the $600 you paid the freelancer who built the creative — total cost becomes $5,600 and ROI drops to about +43%. That single honest adjustment is the difference between "double the budget" and "fix the creative cost first," and it takes ten seconds.

• Compare a stock you held against the index

  A position turned $10,000 into $16,000 over four years. Enter those numbers plus 4 in the holding period. Plain ROI is +60%, which sounds like it crushed the market — but the annualized ROI reads ~12.5% per year. Set that next to the S&P 500's long-run ~10% and you can decide honestly whether the pick was worth the single-stock risk, instead of being dazzled by the big headline percentage.

• Justify a piece of equipment to the finance team

  A $20,000 machine is projected to be worth $35,000 in resale-plus- savings value after three years. Enter cost 20000, final value 35000, years 3. The tool returns +75% ROI, ~20.5% annualized, and a payback period near 4 years. Paste the copyable summary line straight into the approval doc — finance sees the annualized rate and the payback window without you having to rebuild the spreadsheet.

• Set a revenue target from a desired ROI

  You are pitching a $25,000 marketing retainer and your client wants at least a 35% return. Switch to reverse mode, enter cost 25000 and target ROI 35, and the tool shows the final value you must generate: $33,750. Now you have a concrete revenue number to anchor the campaign plan and the success metrics, derived in one step instead of by guess-and-check.

• Sanity-check a side-hustle before committing weekends

  You are weighing a small reselling operation: $3,000 of inventory you expect to clear for $4,200 over one year. Enter the numbers and you get +40% ROI, a $1,200 net gain, and (with one year) a payback that basically equals the holding window. Share the URL with a partner so you are both looking at the identical scenario before splitting the startup cash.

Common pitfalls

• Dividing total ROI by the number of years to get a yearly figure. That linear shortcut ignores compounding and overstates multi-year returns — a 60% gain over 4 years is ~12.5% a year (CAGR), not 15%. Use the annualized ROI field, which applies the real root formula.

• Forgetting to fold fees and side costs into the cost base. ROI is only honest if the denominator is everything you actually spent. Open the extra-costs field and add commissions, shipping, ad-agency fees or maintenance — otherwise your ROI looks better than the money in your account.

• Treating nominal ROI as if it were real return. These numbers do not subtract inflation. A 6% annualized ROI in a 4% inflation year is only ~2% of real growth. Adjust before comparing across very different time periods or against cash you could have kept.

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