The Capital Asset Pricing Model (CAPM) is a widely used model in finance that estimates the expected return on an asset based on its risk and the expected return on the market as a whole. The model assumes that investors are rational and risk-averse, and that they hold diversified portfolios.

The CAPM formula is as follows:

r = rf + β (rm - rf)

Where:

r is the expected return on the asset
rf is the risk-free rate (i.e., the return on an investment that carries no risk, such as a Treasury bill)
β is the asset's beta (i.e., its sensitivity to market risk)
rm is the expected return on the market
To use the CAPM model, you would need to determine the risk-free rate, the expected return on the market, and the asset's beta.

The risk-free rate can be obtained by looking at the yield of a risk-free asset such as a government bond. The expected return on the market can be estimated by looking at the historical returns of a broad-based market index, such as the S&P 500.

The asset's beta can be calculated by regressing its historical returns against the returns of the market index. A beta of 1 indicates that the asset has the same level of risk as the market, while a beta greater than 1 indicates higher risk and a beta less than 1 indicates lower risk.

Once you have obtained these inputs, you can plug them into the CAPM formula to estimate the expected return on the asset. It's important to note that the CAPM is just one of many models used to estimate expected returns, and that it has some limitations, such as its reliance on historical data and assumptions about investor behavior.

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