When you buy a stock, you are not buying a price — you are buying a stream of future cash flows, and the question that matters most is: what return can I reasonably expect? This expected return calculator estimates that number using the Capital Asset Pricing Model (CAPM), the formula taught in every introductory finance course and used by analysts, portfolio managers, and students around the world. It then blends the stock with the rest of your portfolio so you see the expected return of your whole position, not just one ticker.
Adjust the sliders and every result updates instantly. You can stress-test the inputs — try a higher beta, a lower risk-free rate, or a bigger stock allocation — to see how sensitive your expected return really is.
How to Use
- Enter the Risk-Free Rate — the yield you could earn with near-zero risk, such as the 10-year US Treasury note. It is usually between 3% and 5%.
- Set the Stock Beta for the company you are analyzing. A beta of 1.0 moves with the market; a beta above 1.0 is more volatile; a beta below 1.0 is calmer than the market. You can find a stock's beta on any finance portal.
- Choose the Market Risk Premium — the extra return investors demand for owning stocks instead of bonds. Most estimates range from 4% to 6%; 5.5% is a sensible middle-of-the-road default.
- Enter your Stock Allocation as a percentage of your portfolio. The money not allocated to this stock is assumed to sit in safe assets earning the risk-free rate, which is how a real balanced position behaves.
- Type your Investment Amount in dollars — the total sum at stake.
- Read the result card: the expected return of the stock, the expected return of your blended portfolio, the expected annual dollar gain, and the expected value after one year.
The CAPM Formula
The Capital Asset Pricing Model says that the expected return of any risky asset is built from two pieces: the time value of money, plus a reward for taking on market risk.
E(Ri) = Rf + Beta × (Rm − Rf)
Where:
- E(Ri) is the expected return of the stock.
- Rf is the risk-free rate.
- Beta measures the stock's sensitivity to broad market moves.
- (Rm − Rf) is the market risk premium — the extra return of the whole market over safe bonds.
For example, with a risk-free rate of 4%, a beta of 1.2, and a market risk premium of 5.5%, the stock's expected return is 4% + 1.2 × 5.5% = 10.6%. A higher beta raises the expected return; a lower beta lowers it. This is the core tradeoff of investing: more systematic risk is priced in as more expected reward.
Your portfolio's expected return is then a weighted average of the stock's return and the risk-free rate on the cash portion. If 60% of your money is in that 10.6% stock and 40% sits at 4%, the blended expected return is 0.6 × 10.6% + 0.4 × 4% = 7.96%. Applied to a $100,000 portfolio, that is an expected annual gain of about $7,960, taking the expected value to roughly $107,960 after one year.
What Each Input Means
- Risk-Free Rate — the anchor of the model. When Treasury yields rise, every expected return mechanically shifts up, because investors demand a higher baseline before they take any risk.
- Beta — the only measure of risk CAPM cares about. Diversifiable, company-specific risk is ignored because a well-diversified portfolio washes it out; only market exposure is priced.
- Market Risk Premium — the most debated input. Economists disagree on whether the true long-run premium is 3% or 7%, which is why running a range of values is smarter than trusting one number.
- Stock Allocation — lets you move from a single-stock view to a portfolio view. Concentrating 100% in a high-beta stock pushes expected return up dramatically, but also concentrates risk.
Examples
Example 1 — A growth stock in a balanced portfolio. With a 4% risk-free rate, a beta of 1.2, a 5.5% market premium, 60% allocated to the stock, and $100,000 invested, the stock expects 10.6%, the blended portfolio expects 7.96%, and the expected annual dollar return is about $7,960.
Example 2 — A low-risk, bond-like holding. With a 0% risk-free rate, a beta of 1.0, a 5.5% premium, 100% allocated to the stock, and $100,000 invested, the expected return equals the full premium of 5.5%, producing about $5,500 in expected annual dollars.
Example 3 — A large concentrated position. With a 4.5% risk-free rate, a beta of 0.8, a 5.0% premium, 50% allocated, and $2,000,000 invested, the stock expects 8.5%, the blended portfolio expects 6.5%, and the expected annual dollar return is $130,000, pushing the expected year-end value to about $2,130,000.
FAQ
How is expected return calculated?
Expected return is calculated with the Capital Asset Pricing Model: E(R) = risk-free rate + beta × market risk premium. For example, with a 4% risk-free rate, a beta of 1.2, and a 5.5% market premium, the expected return is 4% + 1.2 × 5.5% = 10.6%. The calculator then blends this with the cash portion of your portfolio using a weighted average.
What is a good expected return for a stock?
A diversified US stock market portfolio has historically returned roughly 7% after inflation. Individual stocks with betas above 1.0 may show expected returns of 9%–12%, while low-beta defensive stocks may show 5%–8%. "Good" is always relative to the risk you are taking — a higher expected return usually means higher volatility.
What is the market risk premium?
The market risk premium is the extra return investors expect for owning a broad stock market index instead of safe government bonds. Estimates commonly range from 4% to 6% per year. Because it is the most uncertain input, it helps to test a low (4%), mid (5.5%), and high (7%) scenario rather than relying on one number.
What does beta tell me?
Beta measures a stock's sensitivity to movements in the overall market. A beta of 1.0 means the stock tends to move in line with the market; a beta of 1.5 tends to move 1.5 times as much; a beta of 0.5 is half as volatile. Negative beta exists for hedging-style assets, but most individual stocks have a positive beta between 0.5 and 2.
Is expected return the same as guaranteed return?
No. Expected return is a statistical average of what could happen across many possible outcomes, not a promise. Any single year can end well above, well below, or even deeply negative. The number is useful for planning and comparison, but it says nothing about the actual path the price will take.
How do I calculate the expected return of my whole portfolio?
Multiply each holding's expected return by its portfolio weight, then add the results. If a 60% stock position expects 10.6% and a 40% cash position earns 4%, the portfolio expects 0.6 × 10.6% + 0.4 × 4% = 7.96%. This calculator performs that weighted-average math for you once you enter your stock allocation and investment amount.
Disclaimer
This expected return calculator is provided for informational purposes only and does not constitute investment, financial, tax, or legal advice. Outputs are estimates derived from the Capital Asset Pricing Model and the assumptions you enter; actual returns vary widely and can differ substantially from any expected value. Past performance does not guarantee future results. Always do your own research or consult a qualified financial advisor before making any investment decision.