ROI Calculator

What Is ROI and Why Does It Matter?

Return on Investment (ROI) is the most fundamental metric in financial decision-making. It measures how much money you gained (or lost) relative to what you invested — expressed as a percentage. ROI allows you to compare opportunities of any size: whether a $500 stock trade, a $50,000 rental property investment, or a $5 million business acquisition, ROI puts them on the same comparative scale.

The simplicity of ROI is its greatest strength and its main limitation. The basic formula captures total return but ignores time — and time is critical to investment decisions. A 50% return over 25 years is terrible. A 50% return in 6 months is outstanding. This is why this calculator also computes annualized ROI (CAGR), which normalises any return to an annual figure, making all investments directly comparable.

The ROI Formula — All Variations

Metric	Formula	Use case
Basic ROI	[(Final Value – Cost) ÷ Cost] × 100	Any single investment
Net profit	Final Value – Initial Cost	Dollar gain/loss
Annualized ROI (CAGR)	[(FV/PV)^(1/years) – 1] × 100	Comparing different time periods
After-tax ROI	ROI × (1 – tax rate)	Real return after capital gains tax
Real ROI (inflation-adj.)	[(1+nominal)/(1+inflation)] – 1	Purchasing power return

Full worked example: You buy 100 shares of a stock at $85/share (cost: $8,500). After 4 years, the shares are worth $132/share ($13,200). Basic ROI = [(13,200 – 8,500) / 8,500] × 100 = 55.3%. Annualized ROI = [(13,200/8,500)^(1/4) – 1] = 1.1185^0.25 – 1 = 11.6% per year. With 15% capital gains tax: after-tax net = $4,700 × 0.85 = $3,995; after-tax ROI = 47.0%. With 3% average inflation: real annualized ROI = [(1.116/1.03) – 1] = 8.3% per year in real purchasing power.

Why Annualized ROI (CAGR) Changes Everything

Without annualising, ROI comparisons are meaningless. Consider these four investments — all with identical 40% total ROI:

Investment	Total ROI	Time held	Annualized ROI	Verdict
Real estate deal	40%	1 year	40.0%	Exceptional
Stock portfolio	40%	4 years	8.8%	About average
Business investment	40%	8 years	4.3%	Below average
Savings account	40%	15 years	2.3%	Poor — below inflation

Same total return, wildly different annualised performance. Anyone comparing these investments on total ROI alone would draw completely wrong conclusions. Always use annualised ROI when comparing investments held for different periods.

What Is a Good ROI? Benchmarks by Asset Class

Asset class	Historical annualised return	Risk level	Notes
Cash / savings account	0.5%–5.5%	None	Rate-dependent; currently higher due to Fed policy
US Treasury bonds (10yr)	3%–5%	Very low	The "risk-free rate" benchmark
Investment-grade bonds	4%–6%	Low	Suitable for capital preservation
Residential real estate	3%–6% (price)	Low-medium	Plus rental yield of 4%–8% gross
REITs	7%–9%	Medium	Includes dividends; highly liquid vs direct real estate
S&P 500 index	~10% nominal, ~7% real	Medium-high	Historical average 1926–2023; not guaranteed
Small-cap stocks	11%–12%	High	Higher long-term return; higher volatility
International developed markets	7%–9%	Medium-high	Lower than US over past decade; diversification value
Private equity	12%–15% target	Very high	Illiquid; minimum investments typically $250k+
Angel/startup investing	-100% to +1000%	Extreme	Most investments lose everything; rare winners dominate

The appropriate benchmark depends on the risk level. A 7% ROI on a real estate investment is excellent; on a venture capital fund it would be dismal. Always compare against alternatives with similar liquidity, time horizon, and risk profile.

ROI in Business Context: Marketing, Projects, and Hiring

ROI is as important in business decision-making as in investment analysis. Any expenditure that generates measurable return can be evaluated with ROI:

• Marketing ROI: (Revenue from campaign – Campaign cost) ÷ Campaign cost. A $10,000 Google Ads campaign generating $45,000 in revenue = 350% ROI. Typical marketing ROI benchmarks: email marketing (~4,200%), SEO (~1,400% over 3 years), paid social (~50%–200%).
• Hiring ROI: Revenue contribution of new hire – Total cost of hire (salary + benefits + recruiting + training + overhead). A $120,000 total cost hire who generates $400,000 in attributable revenue = 233% ROI.
• Technology investment: Operational savings + revenue enabled – Technology cost. A $50,000 automation system saving $30,000/year in labor and enabling $40,000/year in additional revenue = 40% ROI in year 1, compounding with each additional year.

The Difference Between ROI, IRR, and NPV

ROI is the simplest but not always the most appropriate return metric. Here is when to use which:

Metric	Best for	Handles cash flows?	Time-adjusted?
ROI	Simple buy-and-sell investments	No	Only via CAGR variant
CAGR	Comparing different holding periods	No	Yes
IRR	Investments with multiple cash flows	Yes	Yes
NPV	Project analysis with discount rate	Yes	Yes
Payback period	Capital budgeting, liquidity focus	Partially	No

For a rental property, IRR is better than ROI because it accounts for ongoing rental income, vacancies, maintenance costs, and sale proceeds — all at different points in time. For a simple stock purchase and sale with no dividends, basic ROI and CAGR are sufficient.

Taxes and Inflation: The ROI Destroyers

Headline ROI figures are almost always before taxes and inflation. The real return you actually keep and can spend is often significantly lower:

Scenario	Nominal ROI	After 20% tax	After 3% inflation (5yr)	Real after-tax ROI
Strong investment year	30%	24%	–14%	~10%
Average S&P 500 year	10%	8%	–14%	~-6%
5-year stock hold (10%/yr)	61%	48.8%	–14%	34.8%
30-year retirement account (7%/yr)	661%	Deferred	–59%	Varies by tax treatment

This table illustrates why holding periods, tax-advantaged accounts, and inflation management are so important. A 10% nominal annual return in a taxable account with 20% capital gains tax and 3% inflation leaves you with approximately 4%–5% in real spending power annually — still good, but half the headline figure.

Frequently Asked Questions